GT250M oversize pistons

[redliner]

Good morning all -

Can I please ask if anybody knows whether a pair of Mitaka piston kits 2.0mm oversize, and marked on the box as for a GT250X7 would be suitable for use in a GT250M requiring a rebore?

I've got a spare pair of 250M barrels on 1.0mm OS bore, but due to the condition, it looks like a rebore will be required if they are to be used in future times.

Many thanks.

[dollydog]

should be no problem, i've used x7, rg250 pistons, alsorts. as long as somebody hasn't put an earlier crank in with 16mm gudge pins [not unknown] you'll be ok. nock pins and ring gaps will be ok and of course the engine will now be a 266cc
cheers, dd.

[redliner]

sounds good, DD - thanks for the info.

[dollydog]

i have bored gt250 barrels out to 58mm, so 56mm overbore is no problem i put +2mm ts125 [58mm] pistons in it and made a gt285
cheers, dd.

[daxman]

Hi DD
In my Haynes it highlights different ring peg positions for later (A,B,C) motor and I think X7 is the same - are the TS125 pistons same as these in that respect?

Cheers