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Topics - johnm

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Japanese Bikes / Honda CB250RS Cush Drive Bushes

« on: May 09, 2019, 08:42:18 PM »

Evening all,

A current project following a rest from my old Bantam is a 1980 Honda CB250RS, which is undergoing full restoration. I have managed to remove the worn out sprocket cush drive rubber bushes (after much cursing) and now I need to find new replacements. This seems to be easier said than done. David Silver do not list them and cannot get any (Now discontinued). I have ordered them twice online from two different ebay sellers and they have sent the wrong ones on both occasions (the much smaller ones for the Xl125 it appears) and don't seem to be able to help with the correct ones.

Am I correct in saying that they have the same part number at the start and the difference is in the end part number? This could be where they are getting confused with their parts lists. I have not quoted any numbers I have left it to them.

Anyway the point of my topic is : Where can I get them? I am running out of ideas would a supplier of rubber suspension car type bushes be any good? Would they be the right type? Any help would be much appreciated.

Sorry to go on a bit I am getting a bit frustrated with this , Oh the joy of old bikes!

Cheers John

British Bikes / Triumph Tiger 90 Piston Rings / Pushrod Tubes

« on: March 14, 2018, 08:49:23 PM »

Hi All
Hope I can get some help with a query I have on my Tiger 90 350 twin 1964. I am doing a top end rebuild and I need some advice on a few issues.
The parts manual lists two taper compression rings and one oil ring per piston for the T90 and the 3TA lists one plain/one taper and one oil ring per piston. I am having trouble locating the taper rings needed and can only find plain rings, oil rings no problem. Should I just fit the plain rings and forget the taper rings? What's the point/benefit of the taper ring? Is it anything to do with the increased compression of the T90? I may be over thinking this one, but I would like to get it right if I can.
When it comes to the dreaded pushrod tubes and seals should I bed the seals in with any sealant? Wellseal/Hermetite or similar.
Many thanks for your help, cheers John

British Bikes / Triumph T90 Amal Carb query

« on: February 03, 2016, 07:57:36 PM »

Hi everyone
I hope someone can help with a carburettor issue I have on a recently purchased 1963 Triumph T90. It is fitted with a different spec carb to the original 376 monobloc. It is a 625 concentric, similar to the MK1.5 with the choke lever on top, which I believe is of Spanish origin fitted to Bultaco etc.
I have no contacts as to who fitted this and why. The issue I have is should I leave well alone and maybe just service it? Should I replace it with an original? Is a concentric any better than a monobloc?
I am not too bothered about originality a so I do not have a problem with leaving it in place. It seems to run OK with this setup, but with not owning a 350 twin before I don't know if it would run better with the original.
Any help would be appreciated, I am scratching my head a bit on this.
Cheers John