Author Topic: rm 125 piston size's  (Read 4987 times)

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Offline MetalMike1982

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rm 125 piston size's
« on: December 10, 2011, 04:28:55 AM »
 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
2003RM125
1991CR125
1982ATC200s
1996 Waveraider700

Offline mark800xcsp

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Re: rm 125 piston size's
« Reply #1 on: December 10, 2011, 04:48:39 AM »
they just rounded the # up it will be the correct size

Offline cnrcpla

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Re: rm 125 piston size's
« Reply #2 on: December 10, 2011, 07:36:32 AM »
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.
Mixin' gas and kickin' ass, Burnin' oil and smellin' royal. Two stroke until I die (which hopefully isn't soon)   If your not mixing gas, your not kicking ass.

Offline 2T Institute

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Re: rm 125 piston size's
« Reply #3 on: December 10, 2011, 08:21:01 AM »
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.

Offline falston1

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Re: rm 125 piston size's
« Reply #4 on: December 10, 2011, 09:45:39 AM »
Wiseco 54 mm is correct. I have one in my rm. Runs very strong, and I am extremely happy with it.  :)
06 yz 250, 98 rm 125.......UNC Charlotte!

Offline motoman356

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Re: rm 125 piston size's
« Reply #5 on: December 11, 2011, 12:14:30 PM »
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
Once more into the fray, once more into the last good fight ill know.