Author Topic: rm 125 piston size's  (Read 4365 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
I have ridden a slew of 250fs and a few 450s. I have also ridden a slew of 125s and a few 250ts and i have loved riding both sides of the fence. but being that money is an issue i chose a 125.