BREAKING NEWS!

Honda CB750, 900 & 1100 Mikuni RS 34mm Carburetors

The biggest problem with the Honda DOHC models (79-83) is the carburetors.
The removal of the air box or a exhaust change can make carb tuning a challenge on these models.
These Mikuni RS 34mm carburtors have been re-spaced, re-jetted and adapted to fit the Honda CB 750, 900 models (79-83)
Problem solved!

 

DOHC-34MM-CARBS     $895.00

Call for availability

 

 

 

Mikuni RS 34mm Air Filters

Fit the Mikuni carbs above.

 

MIKUNI-FILTERS     $89.99

Call for availability

 

 

 

Mikuni Velocity Stacks (Set of 4)

Available in 15mm, 30mm, and 70mm. Compatible with our Mikuni carbs above.

 

MIKUNI-FILTERS     $89.99

In stock, call to order

C

 

 

DOHC Ignition


Cycle X (DOHC) Power Arc Ignitions
 Fits: 1979-1983 CB750, 900, 1000


DO-008   $499.95

Honda CB750 owners have been limited to Dynosaur Ignition systems for years. (Magnetic type sensors)
and Ignition Coils that were designed in the 19th Century.

Here is the bad news!

Magnetic sensors can cause timing to be off as much as 14 degrees. (plus or minus ± 7°)
(Magnets and Magnetic sensors are effected by metal mass, motion, heat and distance from pickup)
The illustration below shows the inconsistency of Magnetic sensors. 
This unwanted fluctuation in ignition timing will make your motor unhappy and give you the impression the motor is not internally balanced properly. 
  
The coils (paper wrapped)  is considered to be early 1900's technology.
This Ignition causes coils develop excessive heat and are prone to failure, due to lack of dwell control leaving the coils on excessively.
Leaving the ignition switch on can cause failure to the coils or the Dyna "S" or both.
Our ignitions have an automatic shut-off coil shut off to prevent such heat and failure.
Dyna 2000's claim to have an coil-off situation, but the minute the motor is turned over they stay on and key must be shut off if engine is killed.  
Ever wonder why most racers carry extra sets of coils?

Here is the good news!

Introducing the Cycle X IDS C and CP versions Power Arc Ignitions

IDS C2-HCB Optically Triggered Ignition

Features preprogrammed:
Spark timing placement in 1° increments.
Placement of 3 Sparks / Compress Stroke.
2 Digital sensors inputs.
4 Independent timing curves.
Electronic 4 Tach output.
Coil saturation control (dwell)
Curve fall back.
Static timing light. 
Automatic Coil shutoff
One coil pack for your 4 cylinder.
Capable of 80,000 volts of out-put.
Extremely fast rise time.
Sparks 3 times every compression stroke and continues through-out the RPM range. (full voltage output)
Other multiple spark ignitions on the market do not multi-spark after no more than 3 thousand RPM.
High amperage output.
Quick disconnect connector. 
Fires at low voltage for easy starting, eliminating starter kickback.
Coils feature section bobbin construction (no paper)
All features are Re-programmable with CP version Ignitions via PLC cable.
(CP Re-programmable Ignition and PLC are Optional)
Installation Instructions

IDS CP2-HCB  Ignitions
All features of the CP2-HCB can be Customized and reprogrammed.
4 Independent Ignition timing curves (controlled by grounding or ungrounding 2 sensor wires)
Coil saturation and placement of all timing sparks 1 thru 3 in multi-spark
Selection of number of output sparks 1-3
Tachometer output type 2-8 cylinder output
Curve Fall back
Rev Limiters (independent in each of the 4 timing curves)
Notes section for timing curve information

2 Sensor Wires may be Grounded or Ungrounded to control timing, between 4 distinctly different timing curves.

May be used to control timing with VOES (Vacuum Operated Switch), Nitrous Solenoid via
relay, Boost Switch, Engine Temperature Sensors or manually controlled via toggle switches.

The best ignition  available for Honda cb750's (period) 

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USE OPTICALLY TRIGGERED IGNITIONS

Please observe the above animation. Most electronic ignitions used to date sense crank angle by using a Hall effect pickup, which is a magnetic type sensor. This type of sensor is inherently unstable & is effected by metal mass, motion, heat & distance from pickup.  In addition most ignitions only sense position once per revolution.  The control system must estimate current engine speed based on the rotational velocity of the previous revolution.  Sudden acceleration or deceleration will cause instability. This instability causes internal vibration that can be observed by the movement seen on the flywheel when using a timing light. The use of a magnetic type sensor can cause timing to be off as much as ±7° giving an overall deviation of 14° or more. With an optical sensor you are breaking a light beam and light beams do not deviate! In addition absolute positions are sensed at multiple key points on the rotor,  90 times per revolution with the new IDS system.  The extreme stability optical systems offer allows the engine to accelerate at a much greater speed, reduces engine wear, allowing for smoother operation & transfer of power.

 

IGNITION TIMING

Understanding engine timing & its relation to load, compression and fuel delivery variables is important to performance. The new IDS ignitions have programmable sensor inputs which can be interfaced to a vacuum activated switch or a MAP sensor. The ignition timing can be set to any value based on sensor input status. The Power Arc CDR or SRČ  also have a vacuum retard capability.  If you have a large dresser (H-D), are under heavy load conditions, have increased engine compression,  have a large bore engine or are using NOS please use sort of ignition retard system. 

 
IGNITION COILS

Pick the right type of coil, do not use paper section coils only use section bobbin coils. Section bobbin coils allow for fast rise times and improved reliability.  Power Arc only sells section bobbin coils.

 
USE IGNITIONS WHICH ARE MULTI-SPARK

During the intake cycle fuel is delivered via a carburetor or injection system and intake manifold into a combustion cylinder. Both of these delivery systems supply fuel to the cylinder in a droplet form, especially at lower rpm ranges. As the fuel is compressed turbulence in a circular fashion is created due to existing head designs. As the primary spark is discharged the concussion of the explosion combined with superheating of the combustion chamber turns the droplets of fuel into a hot vaporous gas. The flame front due to the rolling turbulence created by the heads moves away from the point of ignition to the face of the piston and to the outer cylinder walls. As the piston nears the top of the compression stroke any remaining unburned vaporous gas is circulated over the spark plug, and a fuel roll stall occurs. At this point a second spark is discharged obtaining a secondary burn of the fuel that in a single spark ignition system would be trapped in the upper portions of the head and during the expansion portion of the power stroke would be unburned and then be cycled out during the exhaust cycle as emissions.  With the extreme stability of an optically triggered ignition system in a Multi-Spark mode a repeatable secondary explosion is possible.  This allows for the ability to add more fuel without fouling the spark plugs and achieve higher torque/horsepower

1) The extreme stability of a optically triggered ignition system has the ability to allow the engine to accelerate as much as 30% quicker requiring greater fuel flow to the carburetor. This coupled with enlarged jetting of the carburetor or increased fuel to the injectors means you must maintain a sufficient supply line from the fuel tank to the delivery system by use of an enlarged petcock and supply line or a fuel pump. An example would be that at higher rpm's you may use all the gas in the float bowl of your carburetor and create a lean run situation damaging the engine if fuel supply is not maintained.

2) If you have a sufficient fuel flow in a single spark mode you have enough to operate in the Multi-Spark mode without engine damage because you are burning residual fuel, even though your plugs may show a lean burn. This will normally show an increase in fuel economy (if driven in a similar fashion), horse power and a reduction of emissions output. You could increase the fuel for more horsepower but you should be careful not to over fuel, because if the fuel is not burned by the secondary spark it is exhausted as burning fuel through you exhaust system increasing heat and reducing horsepower output because of an improper air/fuel mixture. This also results in increased emissions output, which is unnecessary.
 


Spark Plugs and Spark Plug Wires


WARNING:  

Use only resistor core spark plug wires with all Power Arc Ignitions. See spark plug wire section below.

Use resistor spark plugs with all electronic ignitions to limit the conducted EMI noise and radiated RFI noise..

Initial suggested settings for spark plug gaps are:

Single plug    0.028-0.032"
Dual plug       0.025-0.030"
These are maximum settings, go down from here

Spark plug gap should be made as small as possible, while still maintaining performance. A wide spark plug gap can cause hard cold starting, misfires during rich or lean fuel conditions, and reduction of upper rpm range. To maintain a good secondary spark (multiple spark) within a wider rpm range it is wise to run a narrower spark plug gap. It is better to precisely place two stable, consistent sparks than to fire one wider spark that may cause misfires under various conditions. 
 

Many Things Effect Spark Plug Gap Settings:

Compression Ratio: The higher the engine compression, the more voltage required to fire the plug, and the narrower the plug gap should be.

RPM: The higher the rpm's the less time the coil has to charge to break over voltage or complete saturation. A narrower spark plug gap will help high rpm stability.

Spark plugs with large side electrodes (ground straps) or spark plugs with split side electrodes are not recommended, they interfere with the flame front at the point of ignition.

Coil choice, fuel flow, intake velocities & fuel temperature are but a few additional factors that can effect spark plug gap.


Spark Plug Choice:

In most cases, it is not until the engine is modified, or the compression is raised significantly, that stock ignition systems and spark plugs begin to show signs of being inadequate. At this point, a variety of factors determine which spark plug will be best suited for a particular configuration. In these modified engines, specific electrode/tip combinations, electrode materials and colder heat ranges can provide measurable gains in power. If your vehicle has had extensive modifications, it would be best to seek the advice of the manufacturer of your vehicle, the aftermarket supplier who manufactured your modifications, or your mechanic.

Modifications that will typically not require specialized plugs (in most cases the factory installed plug will be more than adequate) include adding a free-flowing air filter, headers, mufflers and rear-end gears. Basically, any modification that does not alter the overall compression ratio will not usually necessitate changing plug types or heat ranges. Such minor modifications will not significantly increase the amount of heat in the combustion chamber, hence, a plug change is probably not warranted.

However, when compression is raised, along with the added power comes added heat. Since spark plugs must remove heat and a modified engine makes more heat, the spark plug must remove more heat. A colder heat range spark plug must be selected and plug gaps should be reduced to ensure proper ignitability in this denser air/fuel mixture.


Frequently Asked Questions:

Q: Why should I use a resistor spark plugs & spark plug wires?

A: "R" or resistor spark plugs use a 5k ohm ceramic resistor in the spark plug to suppress ignition noise generated during sparking.

You must use resistor spark plugs & wires in any vehicle that uses electronic ignitions or on-board computer systems to monitor or control engine performance. This is because resistor spark plugs & wires reduce (EMI) electromagnetic interference with on-board electronics.

They are also recommended on any vehicle that has other on-board electronic systems such as engine-management computers, two-way radios, GPS systems, or whenever recommended by the manufacturer.

In fact, using a non-resistor plug or low resistance spiral wound spark plug wire in most applications may actually cause the engine to suffer undesirable side effects such as an erratic idle, high-rpm misfire, engine run-on, power drop off at certain rpm levels, abnormal combustion and probable damage to the ignition and/or ignition coil.

Q: Why are there different heat ranges?

A: It is a common misconception that spark plugs create heat. They don't. A heat range refers to how much heat a spark plug is capable of removing from the combustion chamber.

Selecting a spark plug with the proper heat range will insure that the tip will maintain a temperature high enough to prevent fouling yet be cool enough to prevent pre-ignition. While there are many things that can cause pre-ignition, selecting a spark plug in the proper heat range will ensure that the spark plug itself is not a hot spot source.

 

Spark Plug Wires

Choice of spark plug wires is an important consideration when using an electronic ignition system. Electronic ignitions utilize IC's (integrated circuits) in there design for counting & timing purposes. These IC's, contrary to most thinking, are not effected by RFI (Radio Frequency Interference) noise generated by the high voltage breakdown of coils, producing the ignition spark. They are effected by the conducted EMI (Electro Magnetic Interference) passed to the ground plane of the motorcycle via the spark plug wires & plug. The most effective way to limit the current produced in the secondary of the coil is to use carbon core resistor plug wires. Solid core wires and most spiral wound wires will not suppress this conducted EMI noise.

Stability

Most electronic ignitions used to date sense crank angle by using a Hall Effect pickup which is a magnetic type sensor.  This type of sensor is affected by metal mass, motion, heat & distance from pickup.  The Hall Effect sensor is less stable than optical sensors causing engine inefficiencies and wear, due to internal vibration caused by unstable firing of the spark plug.  An example of this instability would be the movement seen of the TDC timing mark on the flywheel when using a timing light.  The use of a magnetic type sensor cab be off as much as +-7 degrees giving an overall deviation of 14 degrees.  With an optical sensor you are breaking a light beam and light beams do not deviate!  In addition, this system has no timing calculations or cycle delay times effecting spark stability and placement because the system counts rotor slots to maintain an absolute relative crank angle position.  This extreme stability allows the engine to accelerate at a much greater speed, reduces engine wear, allowing for smoother operation and transfer of power.     

Multi-Spark Theory

During the intake cycle fuel is delivered via a carburetor or injection system through the intake manifold and into the combustion chamber supplying fuel to the chamber in droplet form.  This is especially true at lower rpm ranges.  As the fuel is compressed, circular turbulence is created due to existing head designs.  The flame front generated by the fist spark leaves the point of ignition to the face of the piston and flows to the outer cylinder walls.  As the piston advances in the compression stroke residual unburned vaporous gas, leading the flame front, is circulated over the spark plug.  When the piston approaches TDC both static and expanding gas pressures increase and a fuel roll stall occurs.  By precisely discharging a second and third spark, fuel trapped in the upper portions of the head and expelled during the exhaust cycle as emissions is consumed.  In a single spark ignition system this fuel would have remained unburned.  With the use of precision control and the advancement of new coil designs we have achieved the ability to produce high energy secondary and tertiary sparks that are required to ignite fuel that is under higher compression after the first spark.  We believe that by consistent and precise placement of the primary, secondary, and tertiary sparks exhaust emissions can be reduced. 

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Charging Systems
 

Cycle X High-Performance Charging System for DOHC Hondas ('79-83)
New Version!

The new Cycle X charging system has nearly two times the amperage at lower RPM's than the original version. This additional amperage will help keep your battery charged even with halogen light bulbs and such.
The new system simply has a additional internal stator coil  (3 phase)



This 3 phase charging features a 1.7 pound magnetic rotor for instant revs. (Stock rotor is over 4 pounds)



DO-009    $365.00

NOW IN STOCK! READY FOR ORDERING!

Call for availability

 

DOHC Git Kit #1
 

Ignition and Charging System Combo

DOHC-GITKIT#1     $789.00 (Save $35)

Call for availability

 

 

DOHC Git Kit #2
 

Ignition, Charging System, and Carburator Combo

DOHC-GITKIT#2     $1590.00

Big and breaking news. We have replaced the CR carbs with our Mikuni RS 34mm Cycle X re-racked, re-spaced and jetted carbs.

In stock, call for ordering and availability

 

 

DOHC Git Kit #3
 

Ignition, Charging System, Carburator, and Exhaust Combo

DOHC-GITKIT#3     $1989.95

Big and breaking news. We have replaced the CR carbs with our Mikuni RS 34mm Cycle X re-racked, re-spaced and jetted carbs.

Note: The photo shows the black Tri-Y system for an example. You can pick and choose any exhaust system on the DOHC exhaust page.

In stock, call for ordering and availability

 

 

DOHC CR Special Carburator Systems



 Honda cb750 Keihin CR Special carburetors.
We are offering these carburetors in 29mm, 31mm, and 33mm for you Cafe and stock Honda framed enthusiasts.
We recommend phone calls for exact requirements.

CA-099-29
CA-099-31
CA-099-33

Call for pricing!

 

 

Honda DOHC Carb Jet Kit

Honda cb750, 900 DOHC carburetors can be a pain if air filter pods or exhaust system changes are made.
Here is a jet kit to help with your Honda project bike. Many people try jetting their bikes by just changing main or pilot jets with know real progress. These kits have plenty of jets, but the needles are the science and cover a wide range of throttle positions.

JET-001     $125.00

 

 

Cycle X Digger Series Shocks (Chrome or Black Spring)

We love lowered bikes for their aggressive stance and short people love them for obvious reasons (sorry short folks).

Anyway, most shorty shocks are thin and spinally like they were on a moped or something.

Lower your bike with these shocks. 11.4 inches long and a loading weight of 440 lbs.

79-83 Honda cb750, 900, 1100 DOHC

$99.95 (Pair)

 

FR-DIGGER-BLKBODY (Black body, chrome spring)

 

 

FR-DIGGER-CHRBODY (Chrome body, black spring)

 

 

 

79-82 Honda CB750 (4 Valve) 10.25/1 Comp 823cc Big Bore Kit

Our kit is better, why?
Because our big bore kit comes with a gasket set.

Wiseco 823cc and complete gasket set combo (save $240+)

NOTE: Gaskets are no longer available

DO-010    $439.95

Call for availability

 

 

DOHC Valve Springs

Titanium Retainers for Honda CB750 C/F/K/SC DOHC 1979-1983

 $129.95             DO-DOHC
 

 

 

Oil Filter and Cooler Combo
Question:
Want to keep that engine temp down and extend oil durability?
Answer: Cool your oil.
This Cycle X oil filter and cooler combo is different from the rest.
Why? Check it out.

Features:
Alloy adaptor will allow you to run chrome or black high level filters.
Alloy adaptor will allow you to use a oil cooler.
                                                                    
Special feature:
Our alloy adaptor has a built in block off system.
By changing fittings you have the choice of using a cooler.
or not using the cooler.

Kit Includes:
Alloy Oil Cooler adaptor.
Oil Filter.
O-Ring.

Oil coolers mounted from this location are optimum.
The oil is cooled and goes straight to all the vital parts of the motor.

OL-002     $99.95

Choose Filter Color

 

 

For Cycle X DOHC exhausts that we have available, click here.

 

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Cycle X Flange Kit For DOHC

This flange kit replaces your old rusty stock flanges and the half moons on your DOHC bike. Works great with our 4 into 2 System! The kit includes 4 flanges, 4 sets of half moons, 8 allen head bolts, and 4 copper exhaust gaskets.

DO-422F   $149.95

 
 

Honda DOHC Neck Bearings

Safety is just as important as looks. Ever drive a bike with bad neck bearings? Not fun! This tapered neck bearing set will give you support that OEM ball bearings never had. With people changing neck angles, this bearing set is even more important!
Fits 1979-1983 DOHC

FR-034B   $39.95

 

 

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If ordering via phone, please also provide the part # of any products you are interested in for faster and more accurate service.

If you encounter a (rare) broken button as you're trying to add parts to your cart (going to PayPal summary instead of your cart or not opening PayPal at all) or anything else of concern, please call us to report it. We'll try to have it fixed for your convenience within the next 5-10 minutes. Afterwards, refresh the page and try again.

 

It is the sole and exclusive responsibility of the purchaser to determine the suitability of any part, product or work for his or her use.
The purchaser shall assume all legal, personal injury risk and liability and all other obligations, duties and risks therewith.
There is no warranty on High Performance products.

Click to go Back to Honda 750 Index

Cycle X Global Headquarters

6246 US Hwy 51 South

Hazelhurst, WI 54531

Phone: 1-715-356-7346

Email: cyclex@cyclexchange.net

 

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