Question about 2000 Yamaha WR 400 F

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Size in msize in mm of a yamahm of a yamaha wr400 standard piston

Size in mm of a yamaha wr400 standard piston

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92x60.1
12.5 to 1 comp

Posted on Jan 02, 2009

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What is the standard size of diameter of the piston for hyundai accent 2002.


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What oil can you use for a wr400, 2000 model?


I use a synthetic 10w40 in mine. Amsoil is expensive, but I would rather change oil, than a piston. I race in the woods, and change my oil and filter every three hours of runing time. You can go longer for milder riding such as every 5 to 6 hours. Yamaha also sells a good oil, synthetic, and semi-synthetic.

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Max size of cylinder


The biggest bore would be 1mm over.The standard bore on that bike is 65.0mm
so you could bore up to 66mm and to be a 900cc you would need a bore size of 68.5 mm
So your answers
  1. Yes, it can be bored
  2. No,Not to a 900cc
  3. Piston size is 66mm (making it roughly an 843cc)
I Hope this has answered all your questions,But please feel free to ask any more if needed.

Please take time to rate this fixya

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