Author Topic: KTM Cylinder-Piston sizes.  (Read 1461 times)

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Offline nealy578

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KTM Cylinder-Piston sizes.
« on: June 07, 2012, 04:55:27 AM »
Doe's anybody know which size piston i should be fitting to a size 1 cylinder?, As far as im aware cylinders come in 3 sizes, 1,2 and 3, its stamped on the skirt of the cylinder. Also pistons come as A,B and C.

Is it as follows?

1=C
2=B
3=A

or the other way round? 1=A, 2=B and 3=C? This would be the logical way but i have a feeling it's the other way round.

Can anyone shed some light on this for me? :(

Offline eprovenzano

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Re: KTM Cylinder-Piston sizes.
« Reply #1 on: June 07, 2012, 05:05:32 AM »
1=A, 2=B, and 3=C
Eric Provenzano
2001 KTM 380 EXC (mine)
2000 KTM 300 EXC (son's)
2006 KTM 250SXF SOLD!!!
1999 Honda 400 EX traded for a 2006 KTM 250 SXF
Sold 1999 KX250
Sold 1999 YZ125 (son's)
Sold 2001 Yamaha TTL 125 (son's 1st bike)
Sold but never forgotten 1974 Honda Elsinore CR250M
Sold 1974 Honda Elsinore CR12

Offline nealy578

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Re: KTM Cylinder-Piston sizes.
« Reply #2 on: June 07, 2012, 02:52:26 PM »
Are you 100% on that? It's just i have a 250SX cylinder which is labelled a 3 and it has a 66.35 mm piston that came from it which is an A, Im asking as im doing the top end on my 300SX kit and the cylinder has a 1 on it and there's currently a C size piston in it!, from what i can gather it seems the other way round?

Offline SachsGS

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Re: KTM Cylinder-Piston sizes.
« Reply #3 on: June 08, 2012, 10:56:15 PM »
I assume you are given the dimensions for the piston sizes - couldn't a person measure the bore and go from there?