Originally Posted by Paddyd51
This seems to be a normal misconception. Block casting is Toyota but machined by Yamaha to suit their slightly smaller Pistons which have numerous bore grades and compression heights which are coded on crank and rods. Standard Toyota Pistons last about 1 hr due to extremely high compression ratio and boost.
I don't mean this in a nasty way but how do you machine for a smaller piston, the block isn't liners, neither yamaha or Toyota make there own Pistons, just like the rest of the bits on the engine, injector pump for one, turbo as well, you've got to find where they used to buy them from, the compression isn't the problem, it's the bigger turbo
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