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Donnie
August 17th, 2009, 11:55
Did everyone see the new Cosworth bike piston?

http://i44.photobucket.com/albums/f36/cr250r1/Cosworth/DSCN9140-1.jpg
partybarge_pilot
August 17th, 2009, 12:20
British parts in a Yami? It'll never work........





They should apply a little of there expertise to the valves........
Dezertpilot
August 17th, 2009, 13:43
Ok, what is the difference between this and a J/E, etc?
partybarge_pilot
August 17th, 2009, 14:45
Engineering. It's like the difference between Nascar and F1.
Dezertpilot
August 17th, 2009, 16:25
I know Cosworth stuff is BA top of the line stuff but how would this be any better than another high quality piston?
partybarge_pilot
August 17th, 2009, 17:00
Anti-scuff side coating, Electro polished top, I'm not sure what ring package Yami's are running currently, but it's got a very thin single ring package=less friction. Material, Casidiam coated wrist pin, from the wall thickness of it could be a Ti pin..... And all the F1 engineering goodness you could ever want.
Sparky
August 17th, 2009, 18:57
Oooohhhh. The 250F is needing a piston...

Where can you buy?
troyharper
August 17th, 2009, 19:03
Oooohhhh. The 250F is needing a piston...

Where can you buy?

cosworthusa.com
Tell Donavan Norris Troy Harper sent ya
Chase 2
August 17th, 2009, 19:08
Anti-scuff side coating, Electro polished top, I'm not sure what ring package Yami's are running currently, but it's got a very thin single ring package=less friction. Material, Casidiam coated wrist pin, from the wall thickness of it could be a Ti pin..... And all the F1 engineering goodness you could ever want.

Won't a lighter wrist pin change the balance?
partybarge_pilot
August 17th, 2009, 23:01
Won't a lighter wrist pin change the balance?

Yup. For some reason that doesn't seem to bother most piston makers. The Weisco I got for My KLX300 was 10 grams heavy. Boy was that fun to balance out,tapering the ends of the wrist pin was hard on the carbide boring bar........
Sparky
August 17th, 2009, 23:32
Yup. For some reason that doesn't seem to bother most piston makers. The Weisco I got for My KLX300 was 10 grams heavy. Boy was that fun to balance out,tapering the ends of the wrist pin was hard on the carbide boring bar........

What is the big deal? We are only spinning those engines to 13Krpm or so... LOL!! And guys wonder why they get vibrations when they install big-bore kits with heavier pistons.
Dezertpilot
August 17th, 2009, 23:40
So one day when I need a piston look for a Cosworth Piston, gotcha, thanks!!