barrels and pistons

**Sun Apr 12, 2009 8:53 pm » Post: #1 » Download Post**

hi all just getting this right
cylinders
a-large
b-medium
c-small
pistons
d-small
but what letters are medium and
large as i dont want to assume Rolling Eyes

is ti c-medium b-large
i got some barrels of the guy i got my bike of and they are c barrels but when i looked at them they both have small cracks between powervalve ports Shocked

so now know that the spare pistons i have are for c barrels and want to fit them into my b barrels till i know [and can afford] new pistons etc,,,
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**Sun Apr 12, 2009 9:22 pm » Post: #2 » Download Post**

Barrel A - piston B
Barrel B - piston #
Barrel C - piston D
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**Sat Sep 26, 2009 11:58 pm » Post: #3 » Download Post**

Andy, does this mean that a B piston will run in an A barrel with slightly greater clearance? Or does this mean a B pistol in an A barrel will have too tight a clearance?
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**Sun Sep 27, 2009 8:24 am » Post: #4 » Download Post**

Gazza wrote:Andy, does this mean that a B piston will run in an A barrel with slightly greater clearance? Or does this mean a B pistol in an A barrel will have too tight a clearance?

It means that a "B" piston will run in an "A" barrel with the correct clearance.
It is a bit confusing, I dont know why they couldn't just letter the pistons A, B & C as well Confused

**Sun Sep 27, 2009 10:46 am » Post: #5 » Download Post**

paul g

Sorry I didn't explain that properly. I have pistons (and rings) with no markings on them which should go into B barrels. I'm interested to know if I can run them in A barrels. Do you know if HUNTN1 is correct about the A barrels having a greater clearance/larger diameter than the B barrels?

Queensland Raceway is mainly a couple of long straights (boring track but easier for a beginner to learn). I'd like to run bigger clearances to reduce the chance of an engine cease. Apparently there is a post about this but I can't find it.

**Sun Sep 27, 2009 12:14 pm » Post: #6 » Download Post**

Try this for reference:

http://nsr250.net/forums/viewtopic.php?p=39364#39364
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**Mon Sep 28, 2009 8:26 am » Post: #7 » Download Post**

Andy
Thanks - that's exactly what I needed to know