Cycle Exchange

10/25/2026

Camshaft inventory (present and future)

Note:
Until our new website is completed, we will try to keep everybody updated on certain inventories on our page.

Camshafts:
330-X ... Mild "drop-in" grind. OK with stock pistons and springs.
CX-1 ..... Our most popular grind. Due in 4 to 6 weeks.
CX-3 .... Same as a Web 63A. Due in 4 to 6 weeks.
SX-1 .... K-H and Action four SSW-1 camshaft copy. Due in 4 to 6 weeks.
CX-11 .... K-H F grind copy. Due in 4 to 6 weeks.
YTX-1 ..... Yoshimura road and track copy.
KH-D grind .... Very popular and a wide range of power increases.
CX-295 ... Basically a RC-295.
CX-315 .... Basically a RC-315
CX-10 ..... Used in our Honda heavy weight superbike years ago.
384-B ..... Camshaft used by many racers. A favorite.
Honda 500.550 ... We**am 358B
Honda 500.550 Norris R grind.
Megacycle 125-30.

Note:
We have more camshafts with many too large to mention.

Polished engine and the Drag bike engine are so much fun to look at.

10/24/2026

10/24/2026

By request ...... the AHRMA, road race and hot street cylinder head basic info.

1st, 2nd and 3rd photos:

5mm stem valve kit:
Less port obstruction, 13 grams lighter per valve allowing for less spring pressures.
New, redesigned G2 5mm cast valve guides.
Redirected oil drain to the cam chain.
Redirected oil drain to the primary chains and the slipper tensioner.
Only 2 feed "O" rings are used in the head gasket area ... versus 10 oil areas on a stock design.

Notice the copper wire and exhaust gasket in the 1st and 2nd photo.
With the exhaust port designed and finished with an upward angle ..... we needed to make thinner gaskets to remove gasket obstruction because of the extensive port work

Note:
Photos of the port work and combustion chamber will remain undisclosed.

4th photo:
Here is a photo of our "gutted" engine case to help do all the top end mathematics.

Mathmatics include:
Valve to valve.
Deck height checking
Piston to cylinder head clearance.
Valve to piston clearance checks.
Gasket thickness selection.
Determine final compression ratios.

Note:
After the previous checks/adjustments are made ...... the top end is removed from the test engine and installed on the actual engine being built.

5th photo:
Quantity 5 no slip, easy pull 6 spring system nearly completed.

Voted:
Best performance clutch system for a Honda cb750 sohc.
Voting by CycleX.

10/23/2026

10/21/2026

10/21/2026

Random shop photos to keep in touch with the Honda cb750 community.

1st photo:
A few final touches on the CycleX 6 spring clutch upgrade.
I know ...... kinda old news.

2nd photo:
Getting closer to finishing the `"ultimate" cylinder head for road racing and hot street life.
Details and photos will remain a secret for a bit.

3rd photo:
Our favorite camshafts for road racing about to be put in action.

10/17/2026

Honda cb750 sohc clutch talk
The quest for the perfect "higher performance" Honda cb750 engine continues.

With a lot of high-performance products offered for the Honda cb750 and nearly twice the power ..... the clutch can be a problem.

Photo #1:
Here is another version of the clever 6 spring clutch package.
Details:
6 springs for multiple pressure options.
10 Kevlar friction plates. (Stock Hondas have 7 friction
plates)
OEM steels with one double steel.
Lightened outer basket.
Modified inner clutch hub.
Frictions are steel based with Kevlar material. (No alloy expansion for keeping stable adjustments)
Nylon inner clutch sheath with nylon impregnated wire cable. (amazingly smooth)

No chatter.
No slipping.
No lurching forward or dragging.
Smooth, predictable feel.
Race proven.

2nd photo:
We acquired this top fuel rolling chassis a while ago and didn't know much about it except for noticing the high-level workmanship.
We received a phone call asking us if we had any questions about it ...... because he built the rolling chassis.
Turns out the builder was the main fabricator at Kosman drag bike enterprises.
Remember "Sandy" Kosman products?
He had some great stories about the olden days.

10/16/2026

Hello Honda cb750 fanatics, enthusiasts, fans and owners.

Here is a trip down our memory lane to the present.

1st photo:
30 plus years ago we were wanting and needing a carburetor upgrade versus the offerings years ago.
We discovered that 84-86 Kawasaki RS 34 mm Mikuni carburetors were spaced pretty close to Honda spacing.
Theoretically speaking ..... the 34mm carbs were going to be too big for the cb750 engine ..... but we pushed and pulled them into Honda intake manifolds and the rest is kinda history.
The Mikuni's are now respaced even to closer spacing and regularly used on Honda cb750 models.

2nd photo:
30 plus years later with painstaking effort, research and investment the CycleX Honda cb750 cam chain tensioner had a large part curing the OEM tensioner problems plaguing the performance Hondas.

3rd, 4th and 5th photos:
Here is another AHRMA road race engine prepped for the 2027 season ...... you should make plans to see a full grid of high-level Honda race bikes.
2027 schedule coming soon.

6th photos:
Very nice Nova transmission installed in our cut-a-way case to check things ...... just to be sure.

Video:
Many engine builders are amazed at the videos of our crankshafts freely spinning after our case and crankshaft procedures.
Me too.

Random photo:
The assembly room.

10/14/2026

Building a Honda cb750 sohc engine strong first ....... then fast.
Nothing really secretive about these lower end parts or procedures in the photos ....... the top end will be somewhat classified for now.

No real need to have pretty painted or polished parts on a "full mod" race engine.
Fun fact:
Many racers didn't use case sealer because they knew that engine disassembly was inevitable at some point.
We are very confident in our parts and procedures that we used a thin coat of Honda bond ...... also, to avoid a small oil leak and disqualfication.

Lower end list:
18.5 lb crankshaft (stock crankshaft averages 21.5)
Treated to all the numerous CycleX crankshaft upgrades.
Case crankshaft areas are "line lapped" for straightness and roundness ..... then measured and fitted with coated bearings to exact clearances.
Carillo connecting rods are fitted with coated bearings to exact clearances.
Multiple breather modifications.
Late model transmission with 2 degree undercuts and up-down undercuts. 5th gear mod also.
Chain wheel and clutch components are refurbished, small changes, lightened a bit and balanced.
Modern high-level primary chains and slipper tensioners are installed ..... upper and lower areas.
Shift drum mechanism modifications are installed. (wheel and detent spring)
Oil pump with an 8% stronger pressure releif spring.
Deeper finned oil sump pan.

Just a small progress report on some engine work.

10/13/2026

10/12/2026

It's with-in tolerance is a phrase not used around here.

Accuracy, precise measuring, proven upgrades and persistence would be needed to build a "better than new" 50-year-old race engine.

Photo #1:
The crankshaft, connecting rods and engine case area always have our full attention.
Here is some final checking/measuring and cleaning of a full mod Honda cb750 sohc lower end.

Video:
Coated main bearings with precise clearances allow us to briefly spin the crankshaft as a final test.
Looking for irregular main bearing "witness marks" and verifying end play are the goals.

Last photo:
Yes.
Better than new and ready for assembly.

10/11/2026

10/11/2026

10/10/2026

Hello Honda cb750 devoted fans.

Checking, cleaning, machining, testing random full mod engine parts.

Photo #1 and #2:
Always liked looking at parts in real life after some machine work is done ..... so here are some engine cut-a-ways to evaluate the final products from time to time.
Primary chain tensioners for chain control are being assembled in the photo. (upper and lower)

Photo #3:
Crankshaft and rod bearing fitments complete ..... perfect.

Lightened.
Carrillos.
Coated bearings.
Oil holes enlarged and relieved. 020 deep main bearing oil groove machined.
Micro polished.
Blind hole oil passageways cleaned.
Balanced to perfection.
Rod bolt stretch/ torque verified.
Final assembly coming soon.

Photo #4 and #5.

Nearly ready for lower end assembly ..... almost.
More breather mods on a different engine.

Thanks for looking.