Yamaha 422sti pistons

[customcharter]

I have a 2010 422sti 285 hp engine that I need to rebuild I need a couple of pistons I know the block is a Toyota land cruiser 4.2 I have had conflicting reports on pistons Does anyone know for sure weather they are Toyota parts or are they 4x the price yamaha


Any help would be appreciate


Thanks rob

[Ian Austin]

Hi Rob
The pistons are different, the Yamaha ones are very much stronger, the land cruiser ones will melt .

[beamishken]

I rebuilt a 240hp Yamaha engine a few years ago & I used Toyota pistons however they were slightly different to the Yamaha pistons I think the rings were tapered on one set of pistons & parallel on the other

it did work out cheaper to replace all 6 pistons with the aftermarket Toyota items than buying rings from Yamaha

part of the problem you will face is sourcing the pistons as no one keeps them in stock & there are a few variations depending on the year of the Toyota engine. The engine shop I used ordered a couple of variations for me to compare.

the engine ran fine with the Toyota pistons fitted