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Aircooled RD Tech Help 250cc and Above
 Aircooled RD Tech Forum : Tech Zone : Aircooled RD Tech Help 250cc and Above
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kiley_a
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Quote kiley_a Replybullet Topic: 2R8 piston rings
    Posted: 06/Mar/2010 at 11:46am
Just had some 250F barrels re-bored to new genuine Yam pistons (+.25). Can someone confirm that pattern rings cannot be used and I must obtain genuine 2R8 rings. PJME advise I must use genuine as tapers different?
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mervin
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Quote mervin Replybullet Posted: 06/Mar/2010 at 12:38pm
try Bloke0 on ebay also known as govnors bridge they usually have rings listed
merv

Blessed be the cracked because they let in the light
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kiley_a
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Quote kiley_a Replybullet Posted: 06/Mar/2010 at 7:54pm
cheers merv--checked his shop and nothing posted.

Can someone confirm PJME statement?
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mervin
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Quote mervin Replybullet Posted: 06/Mar/2010 at 8:12pm
thay may still be available from Yamaha actually, i asked Damerells a few years back and they could still get gen pistons and rings then
merv

just checked CMNSL site they come up as available at 47 euros a set
search part number 2R81161010

Blessed be the cracked because they let in the light
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kiley_a
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Quote kiley_a Replybullet Posted: 06/Mar/2010 at 9:00pm
Cheers again Merv
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kiley_a
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Quote kiley_a Replybullet Posted: 08/Mar/2010 at 9:40pm
Checked today--still available at Granbys
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RDly
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Quote RDly Replybullet Posted: 08/Mar/2010 at 9:45pm
Originally posted by kiley_a

cheers merv--checked his shop and nothing posted.

Can someone confirm PJME statement?


The top ring is a keystone type and the angle is critical. The lower one is more squared in profile but then some will be too thick to fit in the ring groove so yes PJME is correct
Basildump, Essex.
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kiley_a
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Quote kiley_a Replybullet Posted: 09/Mar/2010 at 10:15pm
Cheers Keefe
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b.pearson
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Quote b.pearson Replybullet Posted: 10/Mar/2010 at 11:34pm
If they are patern 2R8 rings they should work, but I would stick to genuine yamaha. The E anf F use thinner rings than the C and D

Ah, I was thinking 400, dont think the E and F 250's are different to earlier models??? Got a load of pistons for all of them, must take a look
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