Yamagama 100

[Mrs Busa Pete]

I think his pin size is the same, but the Rod is for a bigger bearing. Bearing will need to run on a plated surface.

Hmm I wonder if you got a 1mm precision sleeve if you could run that over the pin (ie inside the Bearing ID) & use the std TZR bearing? Would have to be a tight fit on the pin & would be a pig to insert/remove the pin.


You couldn't fit it outside ie: sleeve the rod, as it wouldn't oil well, . . . unless you cut some slots & likely that would hook up on the bearing.

theres no need to bush the pin or rod theres a large range of inside to out side diamater needel roller bearings avalable

[F5 Dave]

Yes, that is how I did mine. But that didn't cut it, too few rollers & possibly too heavy.

[Mrs Busa Pete]

I'm not sure I understand. care to elaborate?


Perhaps machine the piston to a larger pin & make some end caps, I think that is what Mike did with his old CB360 erm back in the day & is commonplace in drag cars I understand, but still not sure exactly what is entailed.

Bugger! that would have helped with my 125.

So what did you think of my weld fins on idea TZ? Got you thinking yet?

some guys in austallia cut the water jacket of a 125 cc and tiged fins on to qualifiy for a catagory

[Yow Ling]

Pete Jones has an engine like you describe Dave. Its an RG150 with the jacket turned off. He then got a bit of aprox 8 inch dia ally bar made some fins in it with a parting off style tool, bored it to the cylinder od and pressed or shrunk it on. That pretty much covers it .

[Slingshot]

Slingy will have seen Bren's bike when I had it.

I didn't see it, but I wish I did. Actually, Chris mentioned it the other day and it got me thinking. Mind you...priority is to get the bloody thing back together and running

[Mrs Busa Pete]

colliers started mashining my barrel yesterday morning back up here mid next week

[Mrs Busa Pete]

Yes, that is how I did mine. But that didn't cut it, too few rollers & possibly too heavy.

i got the 142017 cage roller bearing from auckland bearings on monday $10+gst each load rated to 1100 as aposed to the 141820 [sleave requierd]with a load rating of 860.
not as many rollers as the tzrs one just biger diamater

[Buckets4Me]

Yes, that is how I did mine. But that didn't cut it, too few rollers & possibly too heavy.

you have been warned

just dont say that Dave didn't tell you so

na realy I have no idear what will happen but F5Dave did something similar and destroyed the engine ???? (go ask him)

hope you have the bike up and running soon

EDIT: re read you post and you are already aware of that so dont mind me I'm just trying to get my post numbers up :P

[TZ350]

Perhaps machine the piston to a larger pin & make some end caps, I think that is what Mike did with his old CB360 erm back in the day & is commonplace in drag cars I understand, but still not sure exactly what is entailed.

Pic-1 A piston and sleeve with bronze bushes from Speedpros old Honda racer.

Pic-2 A close up of the bronze piston pin sleeve.

Pic-3 New steel sleeves. The sleeves cup over the end of the pin and are held in the piston by the circlips in the normal way.

I have seen this done with 2-stroke pistons too.

.

[TZ350]

So what did you think of my weld fins on idea TZ? Got you thinking yet?

I have figured out a way to air cool a RGV250 or NSR cylinder without cutting the water jacket off and welding fins to it. In fact the method I have in mind entails very little modification of the barrel itself but uses lots of copper.

I am in the market for a late model NSR250 cylinder and power valves.

.

[bucketracer]

Handy explination and animation of how a 2-Stroke works.

http://www.southernskies.net/page_in...okeengine.html

.

[speedpro]

The word "supercharge" is used a few times

[gav]

Rut roh ......

[Henk]

Shall I get the ball rolling then


Expansion chambers are not forced induction blah blah blah ......

[F5 Dave]

Pic-1 A piston and sleeve with bronze bushes from Speedpros old Honda racer.

Pic-2 A close up of the bronze piston pin sleeve.

Pic-3 New steel sleeves. The sleeves cup over the end of the pin and are held in the piston by the circlips in the normal way.

I have seen this done with 2-stroke pistons too.

.

um, yeah so this could convert a piston with a big pin to a smaller pin for a rod bearing combo. looks good solution.

. . .But the problem here is that the rod wants a larger pin for the bearing that the rod uses as std.