Question about 2003 Suzuki RM 125

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No spark i have 1 1986 rm 125 but wont kick over unless the engine is warm it will start after alot of bumping, iv put a new spark plug in and checked the electrics but dont wat is causing it please help

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  • marc_gilbert Apr 13, 2009

    there is some compression would new piston rings solve it

  • marc_gilbert Apr 14, 2009

    would u recomend to change the piston as well

  • Anonymous Mar 28, 2014

    Hi there,i have a gsx 750 1991 engine,i have no power from 4000rpm onwards,iv changed my spark plugs,carbs are clean and airbox is clean,what could be the cause?

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  • Master
  • 490 Answers

Check compression

Posted on Apr 13, 2009

  • Jeff Adkisson
    Jeff Adkisson Apr 14, 2009

    it takes 110 lbs of compression for these bikes to run right you will need to mic the cylinder and piston to see if you can get away with just a ring job but i do not recommend it

  • Jeff Adkisson
    Jeff Adkisson Apr 14, 2009

    i would change the piston ,rings,and base and head gasket basic top end

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Related Questions:

1 Answer

Why wont bike start


Probably just a fouled plug. Pull the plug and ground it on the head. Kick it over and check for spark. If you have spark just change the plug and try it.

Jul 11, 2014 | 2003 Suzuki RM 125

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Rm 250 wont start off kick


Don't know if it is water cooled or not, but it sounds like you may have a problem with oil or water getting into the combustion chamber and fouling the spark plugs. Kicking doesn't produce the amount of rpm that you need to fire up a weakly firing plug. I'd check the plugs condition first and replace if needed, and then figure out why its smoking.

May 02, 2012 | Suzuki Motorcycles

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I have a Suzuki rm 125 2005 model and ran it wide open to long and now acts like its flooded... already took Carb apart to clean figured float was stuck found a piece of dirt so I put it back together and...


Does the engine have good compression? The ring in a 125 does not last very long - the bike could be down on compression pressure. Re-ring it.

Is your air filter clean? I've seen them so filthy that they were actually brittle. Check your air filter.

How about your spark plug? They do burn out. Replace with a new one.

If it's loaded up, pull the plug, hold the throttle wide open and kick the snot out of it about 20 times, then put a fresh plug in it and try it again.

Good luck!

Oct 12, 2011 | 2005 Suzuki RM 125

1 Answer

I have a rm 125 and it keeps fouling out the


It is likely your jetting. If your plug is wet it's either way too rich or you are not running the engine hard enough to keep it cleaned out. The smaller 2-strokes don't like to be ridden calmly unless the jetting is spot on and even then they can load up. They were designed to be ridden hard.

This is a fairly easy thing to repair, but it's a bit complicated to learn.

I would suggest popping over to allthingsmoto (dot) com and poking around a little - tons of threads on the site about jetting and how to do it. You'll see me over there.

Nov 12, 2009 | Suzuki RM 125 Motorcycles

1 Answer

1993 suzuki rm 125 has no spark?


best spark plug is iridium plug, takes the heat and lasts alot more rides. could be flooded, take plug out , stick finger over hole , kick start till it drys out. take match stick and clean inside of plug, should be good. otherwise probably a fuel problem.

Nov 07, 2009 | 2003 Suzuki RM 125

1 Answer

I have an 04 RMZ 250 I just re-shimmed the valves and put a new piston in and bike was running great started first kick road it all over the street and golf course. went on ONE ride in the heat and...


sounds like maybe valves were shimmed too tight,check service manual for clearances...better a little loose than too tight,can cause alot of damage to cam & head,be careful!!

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1 Answer

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check if there is spark/fuel then try to bum start as engine will turn over alot longer than with a single kick.

Sep 10, 2009 | 2003 Suzuki RM 125

1 Answer

Basicaly brand new cr25o mx bike wont start


Assuming you are using fresh gas. Check to see if gas is coming out of the line, if not blow back up into the tank and if that works there's dirt in the tank. Check the spark by removing the plug and kicking it over with the plug touching the engine, look for spark. If no spark, try a new plug, if still no spark, you have a stator problem. It wouldn't hurt to clean the air filter in any case. Good luck!

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1 Answer

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have you checked your air filter. If its dirty wash out with air filter cleaner or petrol and replace.

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