edcadfab Posted August 7, 2022 Report Share Posted August 7, 2022 So, I am rebuilding one of my 2 banshees, this one for the last time. It has been almost 15 years since i last actively rode one. It would not start by kicking it, i could push start it. a compression check showed 110 in the right and 40 in the left. broken piston ring. It was already at 66mm bore. i was told it must be resleaved. i was able to have a shop bore it to 66.50 mm. the pistons the shop ordered were incorrect. They was 66.5 mm pistons, however they was for a stock crank and i have a 4mm stroker. All balls racing was able to provide a 66.50 stroker piston kit. now its time to re install the cool head from Pro Design. when i dissembled the cool head, it did have the factory metal head gasket as well as the O rings for a cool head. i am not sure if that was right or not but that is how it was. when i got the piston kit from all balls racing, it come with two metal head gaskets, a thin one like normal metal head gasket, and another one, much thicker, that had a tag saying only use this in plus 4 mm install. my question is do i need the metal head gaskets with a cool head install? does the cool head and its O rings install directly to the top of the jug without the metal head gasket? Thank you for any input Quote Link to comment Share on other sites More sharing options...
hoppedupandcutdown Posted August 7, 2022 Report Share Posted August 7, 2022 What a mess. Cool heads do not use the factory tin gasket. Do you now if the domes are cut for a 4mil build? If not, That would be what the plate and extra gasket would for (I'd guess) Next problem, I've read that head and o-rings might not seal on 66.5 bore. Quote Link to comment Share on other sites More sharing options...
edcadfab Posted August 11, 2022 Author Report Share Posted August 11, 2022 Thank you for the input. from what i know, the domes are correct. However, if they are wrong, then they have always been wrong. is there a number or stamp, maybe a measurement i can take to identify what domes i have ? as for the orings and gasket, do you think i need to use them both because the bore is so big and at its maximum? right now, with both installed, im getting 110 in each cylinder. i feel like 125 per after a fresh rebuild should be more like it. im guessing remove the metal gasket and try again? thanks Quote Link to comment Share on other sites More sharing options...
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