Question about 2003 Suzuki RM 125

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I have lot's of spark on my 83 rm 125. I fired it up after sitting for a long time and it kicked right over. I let it run for a few minutes and then shut it off. now it won't fire up again.! Lot's of spark though. but when I pull the plug out, it's covered in fuel. It's like it just keep's flooding.

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Could be low compression (poor piston rings) or plugged air filter.
If it looks like oil on the plug, not fuel, you could have a crank seal issue, as the right side one will **** in transmission oil if it leaks.

Posted on Mar 25, 2011


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1997 rm 125 won't start why should I do?

For your dirt bike to run you need 3 things:

1. Fuel (gas/air)
2. Compression
3. Spark

Start trouble shooting through these. Make sure your gas is turned on, and that it flows through the carb; if you tilt the bike does fuel run through the overflow tube in the carb? Make sure you have good spark; take out the spark plug from the cylinder, still connected to the ignition wire touch the threaded end to somewhere metal on the engine and turn the bike over. You should see a spark. Finally, do you have good compression, how hard is it to kick over etc.

These are the first things to trouble shoot, I would look on youtube if you don't know what you're doing, there are plenty of helpful videos there. You can also try putting a thimble full of fuel into the cylinder and then kick it over to help it start if it has been sitting a while.

Dec 09, 2012 | Motorcycles

1 Answer

I need help with my rm 125 1995 it has a perfect spark iv cleaned the carb and it don't start but wen I take the spark plug out then I kick it then screw the spark plug back in the kick it it nearly...

the way you explain this, the fuel and air mix is wrong, is the spark plug wet, if it is check the carb air mix screw. remove the mix screw and use a can of air and blow it out. before doing this remove the air filter and the spark plug then spray some wd (brand name) in hole and do again with the air can. then screw back in. leave the air filter off. and put spark plug back in and start the engine you will need to adjust the screw until you can get it to start. when it does give it a few good revs and keep it running for a bit. replace the filter and start engine and you will need to adjust the air screw till the engine sounds right again.

Feb 01, 2018 | 2003 Suzuki RM 125

1 Answer

I have an 83 rm 125 and know nothing about bikes!! I went to fire it up after it sitting for about 8 months and it started right up. Problem is when I went to put it in first gear it cuts the...

yes sir that would be the reason i my self have a 2 stroke ts 250 i use automatic transmission fluid for cars in my i have never had a problem all the years i have had mine

Mar 25, 2011 | 2003 Suzuki RM 125

1 Answer

Take to long to start.. takes almost ten minutes of kick starting... electric starter wont turn over to start bike yamaha ttr 125

The TTR-125 Carburetor's Run Lean by design. Mine had the same issues till I found a post on on Carb and air box Mod. This is a good starting point on gets; 110 and 112.5 main and 17.5 pilot. But you must check spark plug coloring to make sure the jetting is correct. Check spark plug after the bike has been ridden for a wile. I also took out the stock baffle and replaced it with exhaust tip and now it fires up after a few kicks and worms up in a few minutes.

Dec 15, 2010 | 2005 Yamaha TT-R 125 L

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No spark on yamaha dtr 125cc

Sounds like you are flooding the engine with gas. Put in a new spark plug then twist the throttle one time to prime the cylinder. Now get your hands off the throttle and give it a few kicks. Each time you twist the throttle the power valve gives a shot of gas. Too much can flood the engine quickly.

May 17, 2010 | 2000 Yamaha DT 125 R

1 Answer

I have an 83 rm 125 it wont start but i have sparks gas and every thing is their but it wont start what shoud i do

get a compression gauge and test the engine compression, since it is old it most likely needs to be bored out and have new piston and rings installed

Mar 29, 2010 | 2003 Suzuki RM 125

1 Answer

My rm 125 is jumping out of gear?

Do you "kick shift" a lot? (shift at high rpm without the clutch) or did the gear box run low on oil at any point that you know of? If so the syncros in the gear box may be worn. Probably not a do it yourself fix, unless you are familiar with this.
Good luck. Please rate, thanks.

Mar 03, 2010 | 2003 Suzuki RM 125

1 Answer

RM 125 wont run

hi tyler,

how is the carb settings and jet? hows the mixture?

Jul 11, 2009 | 2005 Yamaha TT-R 125 L

1 Answer

Wont kick over

Sounds like a bad crank bearing. Pull the spark plug and kick it over by hand real slow if it hangs up you have a bad bearing. It could be the more but I would check hear first and you will find the rest if any.

Mar 19, 2009 | 2003 Suzuki RM 125

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