Thread: Turbo install
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Old February 6th, 2015, 05:08 AM   #59
swarfman64
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Name: Andrew
Location: Australia
Join Date: Jan 2014

Motorcycle(s): TURBO gpx250 99 CB250/500rs Sherco290 Trials Indian 1911big base (replica)

Posts: 138
Ooops! 58000km of abuse + 12000rpm + 10psi boost + one tiny little knock (detonation) = one broken piston.
It was always going to happen, I was just hoping to get a tune into it first.
My fault, during a software update I put the wrong timing map into it and it was over before I could back off. I tore it down tonight and there is no other damage apart from broken ring lands, bore is perfect. It just started to breath heavy and clearly down on one cylinder. All good, couple of pistons and I'm back in business.
Does anybody know if later pistons will fit? I'd like to just throw in a low k set and save my money for the new engine, the new pistons are a little easyer to find and I really just want to refine the setup before risking a good engine. IMG_4169.jpg
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