Head Work

Head Work

Labor and machine work includes:
All refurbished head procedures include glass beading and inspection.
After the inspection, the valve guides are removed and new guides are installed with our Cycle X procedure. The guides virtually follow the same path and makes valve jobs a breeze. Many machine shops use drifts to remove and install guides. Drifting in valve guides can cause 2 problems. First, the valve guides never seem to follow the same path in the head as the removed guides. Second, the inside bore of the drifted guides can cause a "S" bend on the inside. This "S" bend problem is generally seen on bronze guides installed with a drift.

After reaming and honing the valve guides, the seats are given a multi-angle valve job to manipulate the lapping line or contact area where needed. Once the contact area is in the desired area, the valve job is finished off with a 75 degree cut angle approx. .240 deep on the intakes to greatly improve flow. This area of the seat is the most important and is used by top engine builders in the auto and motorcycle industry.
Finally, The 45 degree is touched off with 150 finishing green stone. Once again, used by top engine builders.
The head is then surfaced to insure flatness and head gasket sealing.
Cleaned, install valve guide seals and install springs as required.

#1 Head Option

✓ Disassemble head.
✓ Clean head and glass bead to inspect.
(Glass bead complete head)
✓ Remove valve guides.
✓ Surface both sides of the head.
✓ Install guides and ream.
✓ Valve job.
✓ Up to 4 Heli-coils will be installed at no additional cost.
(Additional coils will be $19.00 each)

Note: This #1 head option will need to be assembled by the customer (to save you a bit of money)

$325.00 (Labor only)

#2 Head Option

✓ Disassemble head.
✓ Clean head and glass bead to inspect.
(Glass bead complete head)
✓ Remove valve guides.
✓ Surface both sides of the head.
✓ Install guides and ream.
✓ Valve job.
✓ Cam tower bolt holes will be Heli-coiled with our longer coils.
(Additional coils will be $19.00 each)
✓ Head will cleaned and spring height will be set.
✓ Assemble head (ready to bolt on).

$399.00 (Labor only)

#3 Head Option (Ported)

✓ Disassemble head.
✓ Clean head and glass bead to inspect.
(Glass bead complete head)
✓ Remove valve guides.
✓ Surface both sides of the head.
✓ Race port head (up to 915cc).
✓ Install guides and ream.
✓ Finalize port work
✓ Valve job.
✓ Cam tower bolts will be heli-coiled with our longer coils.

Note: Oversize intake valve labor and modification will be an additional $75.00. This #3 package will need to be cleaned and assembled by the customer (to save you a bit of money).

$675.00 (Labor only)

#4 Head Option (Ported)

Note: Oversize intake valve labor and installation will be an additional $75.00.

$775.00 (Labor only)

#5 Head Option (Road Race Ver.)

Same head used on our vintage road racer. Relocated intakes, "D" shaped exhaust ports, 5mm valve stem kit, etc.

Want to be a winner?

$2,800.00 (Parts and labor)

#6 Head option (Big port) introduction.

We decided to reproduce our hot-street, race head for you go fast folks. These cylinder heads have modified, machined large intake spigots. Honda CB750 heads only allow the intake ports to be opened up to a certain amount before breaking through to threads or atmosphere. Epoxies are then needed. These heads will be offered in "K" and "F" versions and are specifically designed to use our Mikuni RS 34mm or bigger carburetors, large camshafts and big bore kits.

#6 Head Option, Stage 1

Many people have their own favorite cylinder head porting gurus, machine shops and do-it-yourself folks to do motor rebuilding functions.

This stage #1 version will have the oversize intake spigots machined and installed with the final porting, guide installation, valve job to be completed by the shop of your choice.

Stage #1 includes:
✓ Oversize intake spigots installed only.

$399.00

#6 Head Option, Stage 2

Stage 2 has the oversize intake spigots installed with full porting.
Guide installation, guide reaming, valve job, valve sinking and assembly would be done by the shop of your choice.

$875.00

#6 Head Option, Stage 3

Cycle X "big-port" heads are some of most powerful in Honda CB750 history. The heads are 80% completed and are waiting for the final camshaft selection and bore sizes. When a camshaft is selected, the valve to valve clearances will be checked and finalized. Also, when the bore size is selected, the combustion chambers will checked and finalized.

Stage #2 labor includes:

✓ Oversize intake spigots installed.
✓ 34mm intake valves sunk to 1.700 valve stem protrusion
    with 0.40 lash caps.
✓ Exhaust valves are stock 1.700 valve stem protrusion
    until camshaft preference is chosen.
✓ Valve guides are installed and reamed/ honed.
   (We like cast guides)
✓ Cycle X deep-cut intake valve job.
✓ Cycle X combination carbide cutter and stone valve job.
    (Intake and exhaust)
✓ Full port work with tricks of the trade procedures.
✓ Combustion chamber blending and big bore matching.
✓ Custom surfacing to desired dimensions

Stage #2 parts includes:

✓ Valves & intake lash caps. (Stainless & Nitride coated)
✓ High lift valve guides (High performance cast materials)
✓ Bee hive valve spring kit ( Best springs available)

Stage #3 parts ... $538.90
Stage #3 labor ... $1274.00

Final cleaning, final assembly would be done by you to save a buck or two.

#6 Head Option, Stage 4

Same as Stage #2 but cleaned, springs checked, and pressures set. Valve to valve checked and set, cleaned and final assembly with Kibblewhite viton valve seals.

Same as Stage #3 pricing with a additional $85.00 for assembly.

Ready to install and shock the world.

#6 Head Option, Stage 5

Stage #4 labor includes:

✓ Oversize intake spigots installed.
✓ 34mm intake valves sunk to 1.700 valve stem protrusion
    with 0.40 lash caps.
✓ Exhaust valves are stock 1.700 valve stem protrusion
    until camshaft preference is chosen.
✓ Valve guides are installed and reamed/ honed.
   (We like cast guides)
✓ Cycle X deep-cut intake valve job.
✓ Cycle X combination carbide cutter and stone valve job.
    (Intake and exhaust)
✓ Full port work with tricks of the trade procedures.
✓ Extensive port refinement with special attention to
    valve guide and valve guide areas.
✓ Combustion chamber blending and big bore matching.
✓ Cleaned and assembled with Kibblewhite viton valve seals.
✓ Valve spring pressures and valve to valve clearances
     checked and set.

Stage #2 parts includes:

✓ Valves & intake lash caps. (Stainless & Nitride coated)
✓ High lift valve guides (High performance cast materials)
✓ Bee hive valve spring kit (Best springs available)

Stage #5 parts ... $538.90
Stage #5 labor ... $1574.00

Ready to race!

#6 Head Option, Stage Ultima

The biggest, baddest one of a kind Honda cylinder head currently on the market.

This #6 option (Ultima) has unlimited options, like...
5mm valve kits.
Special made over size 5mm valves or any oversize valve stem diameter.
Oversize bronze valve seats for large valves.
Valve to valve work or angled valve machining for huge valves.
Valve spring considerations for mega camshafts.

These Ultima cylinder heads will be priced by time and materials.

Big Bore Combustion Chamber Blending

This combustion chamber service will perfectly match your larger cylinder bore to your combustion chamber.

This procedure is done to any bore size and is accomplished on our milling machine and then hand finishing for extreme accuracy.

$129.00 (Parts and labor)

F2 Drain Hole Modification

As great as Honda is and was...a mistake was made.
4 cylinder studs are exposed through the fins in the head which could allow dirt and road debris to enter the lower end.
Honda tried to correct this problem by putting large “O” rings at the bottom of the studs to prevent water and debris from entering the motor.
Here is what we do, drain holes are drilled and honed to accept brass tubes. Brass tubes are pressed into place and problem solved.

$129.00 (Parts and labor)

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Cycle X Global Headquarters

6246 US Hwy 51 South

Hazelhurst, WI 54531

Phone: 715-356-7346

Email: hotrodcyclex@gmail.com