Mtc or wiseco ?

[posplayr]

CP,,JE which is better if any difference?

JE is a new ZO6 & CP is F1 This is just a fact.
Ray.

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[Big Jay]

From 3 posts ago. http://www.gszone.biz/
I am sure this gentleman can take care of your crank and piston kit needs.

If it is not twisted, we do the welding.

[Big Jay]

As I remember the MTC uses a little larger piston to cylinder clearance then Wiseco. MTC .005 compared to .003 with the Wiseco's. When measuring them they also had a little more taper. I can say I have installed some MTC pistons and noticed that they rattled or you may say slapped in the bores a little more during warm up before they quieted down. Therefore I thought they may cause the piston skirts and cylinder walls to wear out quicker. I stand to be corrected but that may be a deciding factor on which ones to use for durability.

MTC actually set up very tight. Only pistons I have seen that sets up at .005" would maybe a Venolia.

[gs11ezrydr]

Sorry about the wrong numbers I reread the instructions since then and it should have been .0005-.001 for the MTC's . Thanks for the correction.

[Chuck78]

I've been running a set of old clearance-sale NOS 72mm 920cc GS750 pistons from MTC Engineering for 3 seasons now, & running them very hard at that. No problems, no burning oil, no piston slap. I do take Ray's well versed opinion pretty seriously, however. If I can afford to, I may go CP on the next 6 pistons to make a 944cc GS750 & 489cc or maybe same as above for 502cc in a GS425 with GS850 sleeves.