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skikman

Joined:

Nov 09

Posts: 174

skikman says:

where is the copper coming from

hi all.i have an unbelievably hard to find parts for gilera sioux 50.it needs a barrel and piston.when i took the barrel off there is like fine copper filings around crank.nothing seems broke but where is it coming from?also anyone know of another bike that uses the same top end[spring mounted exhaust]

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  • Posted 4 years ago (21 August 2011 19:07)

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bbstrikesagain

Joined:

Nov 08

Posts: 879

bronze..

..fairly common material for needle roller bearing cages, has a lot of copper in it, looks a bit like copper, but harder due to iron content and gotta be capable of scoring a barrel or two.  Split the cases and get it ALL out of there.

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skikman

Joined:

Nov 09

Posts: 174

skikman says:

thick

sorry i dont mean to sound thick but when you say needle roller bearing cages are you talking about the bearing in the conrod where the piston is held on?do i replace it?

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smoto5

Joined:

Mar 09

Posts: 4548

smoto5 says:

Needle roller bearings are fitted in

each end of the conrod on that bike, like most two stroke engines, one at the piston/little end/gudgeon pin and one at the big end/flywheel/crankshaft end, most likely the big end one has broken up into pieces and been ground into smaller pieces or part of it failed and the continued use of the bike causing all those fine particles you can see. Normal appearance unassembled is like a cage with thin rollers held in the gaps. You are likely to be looking at getting a conrod kit and then crankshaft split apart and rebuilt with the conrod kit. 

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skikman

Joined:

Nov 09

Posts: 174

skikman says:

thanks

thanks for that explanation.i kinda need thinks broken down and told that way.ok then i'll take engine out and give it ago.

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davi82a

Joined:

Jul 11

Posts: 20

davi82a says:

over 20 years of experience?

After all these years and u haven't done an engine rebuild. I'm only 18 and I even know my way around an engine. Why are you still faffing around with 50cc anyway. I grew out of them when I turned 17. The years of experience don't include push bikes mate. 

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skikman

Joined:

Nov 09

Posts: 174

skikman says:

experience???

the 20 years experience i have is only of riding.i did not post that i had 20 years experience with bikes some other[ass] did.im only just learning,and asking for help which alot of you good people give me.many thanks.

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soapes

Joined:

May 10

Posts: 127

soapes says:

Experience

I have over 20yrs experience riding and working on bikes, and I still come across things new that I don't know. Like the saying goes "you never stop learning." In my book it doesn't matter whether someones on a 50cc moped a sports bike or whatever, a bike is a bike if that's what you enjoy (working on or riding) then good for you.

People come to this forum and ask for help and advice, as a likeminded community I believe people should share advice and knowledge, not criticise others.

Apologies for bit of a rant, it annoys when people ask for help and are met with mockery.

Sorry can't be much help with the metal filing mystery, I'd guess it's as other have said though (big end bearing breaking up)

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