Two Stroke Motocross
Two Stroke Motocross Forum => General Two Stroke Talk => Topic started by: MetalMike1982 on December 09, 2011, 08:28:55 PM
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I'm about to order a piston for my rm125 but I noticed that the standard bore wiseco is 54mm , other brands say standard bore is 53.95 . why are they different sized like that ? or is that not enough to make a difference? Also are Pro-x pistons good ? Never used one and interested to know . thanks in advance
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they just rounded the # up it will be the correct size
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The small amount of difference should be fine. I have never used a pro x piston, I stick to wiseco, but if you do end up by using a pro x, let me know how it works out.
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Would actualy be a good idea to measure the cylinder before buying the piston. If the cylinder has worn 0.01mm you can go to a 53.96mm piston. Pro-X pistons are generaly 10g lighter than stock pistons but for a strange reason have 10g heavier gudgeons. Using the Pro-X with the stock gudgeon works well.
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Wiseco 54 mm is correct. I have one in my rm. Runs very strong, and I am extremely happy with it.
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just make sure you have the correct height on the piston meaning for the correct year. suzuki played with different rod lengths from 98-04. they went from a long rod motor 110mm length which used a shorter piston, to a shorter length rod with domed piston around 98mm i think??, then in 04-up the switched back to a long rod 104mm with flat top piston.
i only mention this as i was was given the 03 piston for my 04. it was taller and domed. i somehow got it started but i noticed the spark plug kept backing out after riding and i was down on power. i pulled it apart and the piston was slapping the head. it ended up damaging the crank bearings