"Billet" Cycle X 890cc Piston and Sleeve Kit, 77-78 "F" Supersport Models
Back in stock.

We are proud and excited to release these Billet Wiseco pistons with our race proven Cycle X domes.

Why Billet?
Without blanks or forgings to achieve the race proven dome configurations, the pistons needed to be billet and built from scratch.
Secondly, Billet pistons can be machined on the undersides to reduce even more weight and run shorter wrist pins.
Conclusion, world class pistons for your five decade old hot-rod Honda.

Honda cb750 sohc models seem to love this bore size with or with-out port work with great reliability
These kits are commonly used with slight combustion chamber modifications  and camshafts similar to the CX-11 for best results.
Depending on the year or combustion chamber modifications the compression ratios are in the 10.40 ish to 11.5 ish range. Your camshaft selection, milling, chamber modifications and gasket thickness will affect or alter these compression ratio figures.

Why Cycle X sleeves?
Our cylinder sleeve are denser, harder and longer wearing than any sleeve on the market. Most machinists can hear and feel the difference when boring/honing the cylinders.

Note: Cylinders will require re-sleeving.

These pistons have a bare weight of 173 grams and have a Armor Glide skirt coating, tool steel wrist pins, XA ring sets, .00190 piston to cylinder wall clearance, and larger and deeper valve pockets for big valves and big camshafts.

# F2-890-KIT

 

 

 

 

 

 

 

 

The Problem:
Honda CB750 F Supersport models have several problems with the top ends.
They wear out valve guides prematurely, the valves are unleaded fuel unfriendly, the top valve spring retainers are stamped steel and can pull the keepers through causing a valve to drop in the motor.

The Fix:
Cycle X Cast Iron Valve Guides:
Kibblewhite manufactured cast iron guides are made from the best hardened material available. The guides are 49.50 mm in length for added support and longevity.
 
Cycle X Intake Valves:
One piece forged, high nickel stainless, swirl polished and nitride coated.

Cycle X Exhaust Valves:
Kibblewhite manufactured exhaust valves received ours and Kibblewhite's full attention because the exhaust valves and guides are the biggest problem. These specially designed exhaust valves have great flow characteristics and combined with Kibblewhite's proven black diamond process makes these valves the best money can buy.

Cycle X Valve Seals:
Perfect for this combination of valves and guides.

Cycle X Retainers:
Honda CB750 77-78 K's and especially F2's have the potential of the keepers pulling through the top spring retainers and dropping the valve into the motor. Many people have felt this heartbreak for the past 30+ years. Honda's later model spring retainers are stamped steel, combined with a steep keeper angle, has only been addressed by complete spring kits costing hundreds of dollars, until now.
 We have been working with Kibblewhite and have developed these top retainers to cure this problem once and for all at a reduced cost.

 

 

 

 

O-Ring Oil Feed Modification

There seems to lengthy discussions about head gasket thickness, o-ring thickness, cylinder block thickness, oil leaks, oil starvation to the camshaft, etc. Anyway, here is what we have been doing for decades. We install dowel pins so the o-rings stay in place. We have seen many circumstances where people have installed oversize o-rings or thinner gaskets and the o-rings worked their way inwards, causing numerous problems. Honda used this procedure on oil lines and other areas. Not sure why they didn't do this to the top of the cylinder.

 

$49.00 (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)


 

 

 

 

 

 

 

F2/F3 camshaft and spring tid-bits of info.

This photo simply shows valve to valve measuring location when big camshafts, oversize valves or both are being considered.

"Valve to valve"

You will need a minimum of .040 valve to valve clearance.
The camshaft and valve spring selection for the F2/F3 models is not as limited as you think. With a little help from the Camshaft, Springs & Related page, you can take advantage of those big valves in the 77-78 F models.

 

 

 

 

 

 

 

 

 

Honda CB750 F2/F3 head gasket note:

These 77-78 F combustion chambers are oval shaped and regular K model head gaskets that are sold will not work. There are a few standard OEM Honda 77-78 F floating around on eBay and other places. If you want to run a MLS head gasket, you can use a 65mm or bigger bore without a problem.

 

 

 

 

 

 

 

 

 

 

Cylinder and head surfacing.

This machining offering is done for a couple of reasons.
To insure gaskets have a nice/flat surface during installation or to set your piston deck height and squish.

 

 

 

 

 

 

 

 

 

 

Upper Case Boring

This procedure is needed for big bore applications when large sleeves are installed.

$100.00 (Stud removal is extra $)

 

 

 

 

 

 

 

 

 

 

Big Bore Cylinder Work
(900cc and above)

Includes: Glass bead cylinder, remove sleeves, surface bottom of block, bore and hone block and install sleeves, surface top, bore and final hone.
Also,
We machine "O" ring groves and install new O-rings to insure oil will creep up the cylinder sleeves to atmosphere.

$375.00

 

 

 

 

 

 

 

Bore and Hone (Budget Version)

Includes: Surface top, bore and hone. Glass beading not included. (Can include torque plates for another $60.)

1st over $150.00
836cc $169.00

 

Bore and Hone (Deluxe Version)

Includes: Glass bead cylinder, surface top, install (6) Heli-coils with race proven 12mm long coils for added support, bored, beveled and final honed. (Can include torque plates for another $60.)

$239.00

 

 

 

 

Torque Plate Bore & Honing

Torque plate bore and honing procedures will simulate your motor being together. This procedure is used in almost every high level machine shop in the country.

$40.00

 

 

 

 

 

 

 

 

 

Rocker Arm Lightening

Same technique used in our vintage road racer.
When high level acceleration is needed, every detail is important.

$119.00

 

 

 

 

 

 

 

 

 

 

Honda CB750 Rocker Arm Refurbishing

Hard welded and ground to perfection.
$65.00 each rocker arm.

$492.00 (Set of 8)

 

 

 

 

 

 

 

 

 

 

Tech tip:

Lighter valve trains can be super beneficial for performance increases when "combined" with 5mm valve kits, bee-hive springs, titanium jam nuts and lightened rocker arms. The above photo shows the excess material that can be removed to get the full benefits of lighter weight valve trains. Lightening the rocker arms near the pivot shaft would be a waste of time. Your goal is to lighten as far out as possible.

 

 

 

 

 

 

 

 

 

 

Honda cb750 (77-78) F2 Section

 

F2 Pistons

 


F2 Git Kits
(High performance combo kits)

 


F2 Valve Train
(Valves & Valve Guides)

 

F2 Springs & Other Hardware

 

 

 

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Cycle X Global Headquarters

6246 US Hwy 51 South

Hazelhurst, WI 54531

Phone: 715-356-7346

Email: hotrodcyclex@gmail.com

 

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