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Messages - martin_uk

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1
Member 4 Sales / Re: CB750F1 sohc Parts for sale
« on: November 28, 2025, 11:23:42 AM »
I also have a very good condition twin piston rear brake caliper, previously overhauled, with new seals and pads and is powder coated £150

A powder coated headlamp bracket one indicator arm slightly distorted £135

Top and bottom yokes, powder coated with taper bearing head races and all clamp/pinch bolts zinc plated £150

I can email photos

2
Member 4 Sales / CB750F1 sohc Parts for sale
« on: November 27, 2025, 02:52:14 PM »
Im having a clear out and will be making available parts from a 1977 model to help fund work on another one :)

Most of parts refurbished approx 10 years ago covered a short distance and stored in dry.

Frame, swing arm, headlamp and carbs not available

Generally complete assemblies ready to install and would prefer collection from near Guildford, Surrey.

Front Wheel complete with new bearings, disc, axle, speedo drive, tyre with minimal use, rebuilt with new spokes, Black powder coated rim £375

Rear Wheel complete with new bearings, axle,  disc, axle, tyre with minimal use, rebuilt with new spokes, Black powder coated rim £350

Front forks complete with new seals and caliper bracket £350

Battery carrier complete with rubbers and zinc plated fixing bolts, powder coated, ready to fit £60

Oil tank, powder coated with cap/dip stick £50

Motad stainless 4 into one exhaust and silencer £150

Top and bottom yokes, powder coated with taper bearing head races £150

I will list more later or let me know what you need and can send photos by Whatsapp or email

 

3
CB750 / Re: Pattern Instruments
« on: August 15, 2025, 04:20:31 PM »
I had same problem with DS repro Tacho, under reading and over damped from first use, but too late to return.

4
CB500/550 / Re: Rev counter oil seal removal CB500K
« on: May 01, 2025, 12:26:54 PM »
My theory is they rebated it to aid locating it but then changed their minds. I don't think the rebate helps, it can pull the top back if the screw is tightened too hard and crack the drive inside the camcover. I have a friend looking into making me some tacho drives in another metal to stop it breaking so easily. He has his own CNC machine and likes a challenge. The stumbling block is how much it would cost to make, we'll see.

I also wonder if people have tried to draw in the housing with new outer O ring, using screw.

Mine needed a tap with rubber hammer to seat

5
CB500/550 / Rev counter oil seal removal CB500K
« on: April 30, 2025, 09:30:59 AM »
My basket project didnt come with the rev counter drive housing, but managed to find a used one on Ebay.

Wanted to change oil seal but difficult to find a suitable size rod to push out as just slipped through hole and couldnt hook out.

Solution was to soak housing in paint strippoer for a few hours which disintegrated the rubber and allowed it to be hooked out.

Still dont understand why Honda rebated the mating surface on cam cover by fixing ?


6
CB750 / Motorbike moving dolly/skate
« on: March 28, 2025, 10:56:13 AM »

7
CB750 / Re: Neutral Light Staying Lit
« on: March 27, 2025, 04:55:33 PM »
The neutral light is powered from switched live and switch grounds other wire (same as oil pressure)

First check is disconnect neutral wire and if light stays on you know it is a short to ground

8
CB500/550 / Re: CB500K2 four 1975 timing chain tensioner fitment
« on: February 23, 2025, 12:01:12 PM »
Most require the head off again. Lift the barrels an inch or so, compress the tensioner by hand and lock it off with the locknut, Then lower the barrels whilst making sure the end of the tensioner goes into the slot. Check the tensioner body isn't bent, a lot are. It should look straight to the eye. If it's bent straighten it.

Thanks Oddjob.

This was the only way to do it.

9
CB500/550 / Re: CB500K2 four 1975 timing chain tensioner fitment
« on: February 22, 2025, 12:40:31 PM »
Unfortunately, as others have commented, can't fit the tensioner into locator with the head on.

The problem is the adjuster stud holds tensioner too far over before it can be inserted to bottom fixing.

Will try with head off but suspect barrels will need to be lifted as suggested to insert adjuster stud before lowering.

10
CB500/550 / Re: Trouble with bike
« on: February 22, 2025, 12:34:19 PM »
I have experienced many issues in past with E10 petrol due to 10% ethanol content.

One of main problems is the drawing in of water from atmospere and damage to rubber parts not designed to resist

I go out of my way to use Esso E5 Super as was the lowest ethanol %

11
CB500/550 / Re: CB500K2 four 1975 oil pick up fitment
« on: February 20, 2025, 03:46:46 PM »
Thanks for comments.

Assuming oil level is higher than joint you would think that unstrained oil would be sucked in.

Maybe its designed like that so that is strainer blocks can still draw oil ?


12
CB500/550 / CB500K2 four 1975 oil pick up fitment
« on: February 20, 2025, 08:50:17 AM »
Thanks for help withother issues , its great to have input from others with more experience on these engines.

I have another question, re the fitment of the oil pick up filter in sump.

It is quite a loose fit and only held in position by sump plate. I would have been happier if there was an O ring to seal it, but no groove apparent.

Is this how they are or have I missed something?

13
CB500/550 / Re: CB500K2 four 1975 timing chain tensioner fitment
« on: February 20, 2025, 08:42:20 AM »
Might be of help? This is a picture of mine, you can clearly see where the tensioner end was! Now sitting in the correct position.



Sent from my iPad using Tapatalk

Thanks, it really helps

14
CB500/550 / Re: CB500K2 four 1975 timing chain tensioner fitment
« on: February 20, 2025, 08:39:58 AM »
Might be of help? This is a picture of mine, you can clearly see where the tensioner end was! Now sitting in the correct position.



Sent from my iPad using Tapatalk

Thats great really helps

15
CB500/550 / Re: CB500K2 four 1975 timing chain tensioner fitment
« on: February 19, 2025, 06:55:26 PM »
Good shout, sump off and bottom of tensioner out of recess.

Even with tensioner compressed not able to angle in enough as up against inside of head.

Will try again tomorrow, but suspect head may need to come off to get correct angle unless anyone has a special technique?

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