Question about Suzuki RM 125 Motorcycles

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I have a rm 125 and it keeps fouling out the

I have a rm 125 and i just put rings on it and when i ride it it putts real bad with no power and the spark plug gets fouled out (soaked with i think oil, did compression test and everything ok) and it wont start and it wont have a spark, but if i change the plug i can kick it once, ride it for a little bit, but then it shuts off again need help dont know what else to do? what is the problem

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  • 194 Answers

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.

Posted on Nov 12, 2009

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Oil blowing out of my exhaust- rm 125


check ur compression dry and wet to see if u have bad rings oil will blow by if bad if ur wet reading is higher than dry. bad rings

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My 2003 Suzuki rm 125 kick starts with brand new spark plug then eventually bogs down and dies, does the same when push started, does it need new piston and rings?


HI,,sounds like your plug is fouling,,what pre-mix ratio are you running? and has the carb been played with? run 32-1 premix and remove and clean the carb.

piston and rings are not to blame for this behaviour.

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Fouled plugs are typically caused by jetting that is too rich. This could also be from a dirty air filter which can make the bike run rich. Clean up your filter and see if that is it. If the filter is not too bad, you might want to drop a size on your pilot or main.

Another possibility is poor compression - this can make a 2-stroke run richer than normal as the fuel can not be burned properly. Rings don't last long in these 125s. I used to re-ring each week when I was racing 125s.

You might want to run a B8ES plug, too - this is one step hotter and will help the plug from fouling as often.

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Clean and dry the air filter? Go back to a stock main jet, at least to check things out? Are "O" ring seals on the main jet going bad?Partial internal collapse in exhaust (remove exhaust pipe & do a quick run down the alley), Install a new stock NGK spark plug, Be sure battery connections are clean and tight, Be sure intake manifold and carb are good and tight.

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1 Answer

Spark keeps fouling but no clue why


Are you losing gear oil.
When the crankshaft seal leaks, oil from the gearbox is sucked into the crankcase, and this can foul the plug.
Also check the plug gap, most guys set the gap too small. It should be 0,7mmto 0,8mm. The plug should be a B9 EG, or equivilant.
Now, you can also change the plug cap to a type that has a built in resistor, this also helps with plug life.
Note that 2 strokes use plugs way more than 4 strokes, and you should replace the plug every 15-20 hours to keep your riding pleasant.
Good Bike you have there
Cheers
Jon

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2005 RM 85 fouling plugs every ride.


obviously theres way to much oil in the mix. Speak to your local bike shop and ask them on the best mix for the bike

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