Question about Suzuki RM 125 Motorcycles

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How do you tell if the power valve is working on a 1990 rm 125. it is real doggy on the top end.

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If the bike does not bog out on the bottom end then the power valve is working. Try cleaning the carb and be sure gas flows freely past the float needle.

Posted on Aug 03, 2009

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Will a 1999 Suzuki RM 125 power valve assembly work on a 2000 Suzuki RM 125


Hi, Anonymous after careful deliberation 4 out 5 Suzuki Gods give this one a thumbs up, but just to be on the safe side you should give your local dealer's parts/service department a call to confirm. For more information about your question and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
http://www.crservice.dk/Suzuki%20cross/RM125/RM125K7_01A.pd OEM parts for Suzuki
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http://www.autoevolution.com/moto/suzuki-rm125-1987.html#aeng_suzuki-rm125-1987-124

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1 Answer

Low power it cant reach the max speed 100 k/ph


If you are talking about a 2003 RM125, it shouldn't reach 100k/ph, or 65 m/ph. But, ...
make sure the air filter is clean, your premix is 32:1, and do a compression test.
Finally, make sure the power valve is working, or you wont get that "top" end power.

Aug 10, 2010 | 2003 Suzuki RM 125

1 Answer

I have a 1990 suzuki rm 125 starts first kick, but boggs alot, every once and awhile power band kicks in and it runs good. I checked spark good and blue, checked reed valve in good shape. pulled head...


I'd start by thoroughly cleaning out your carb.,...check/replace the main jet with a leaner, [higher #], jet...change/clean pilot jet also,..spray carb cleaner in all holes and blow out w/compressed air. Re-check your float height and/or any damage to the float pin+tangs etc. Maybe try a 50:1 gas:oil mixture. Perform a leakdown test,..air will cause boggs as well. *[p.s.; does bike blow oil out exhaust?].

Apr 09, 2010 | 2003 Suzuki RM 125

2 Answers

125 wont idle


One of two things come to mind:

Either your pilot circuit is too lean (colder winter air needs more fuel) or your compression is down. 10 hours on a 125 top end doesn't sound like much but the longevity of the top end depends on many variables including how hard it is ridden, mix ratio, jetting, compression, etc. To me, 10 hours is a lot for a 125.

Where are you located and what is the temperature there? If it ran well in 75F weather and it's now winter, it's likely in need of a larger pilot jet.

Dec 29, 2009 | 2003 Suzuki RM 125

1 Answer

What year of motors will bolt up to my 1994 rm 125? i had 5th gear pinned and it just skidded to a stop, i removed the top end to see that the piston was moving but was hanging up on the lower end. the...


take the barrel off and inspect the bottom end is ther movement in the conrod is it stiff moving if not its your crank bearings probably gone or the small end bearing has worn and stiffened up

Aug 28, 2009 | 2003 Suzuki RM 125

1 Answer

Suzuki RM 85 exhaust valve adjustment


I will come back to you with the method for adjusting this.
If you set the power valve to open at a higher rpm or restrict the vavle from opening to its maximum then your problem will be solved.

If you do the latter though you will definately lose your power at high rpm.

Aug 04, 2009 | 2003 Suzuki RM 125

2 Answers

2003 Suzuki RM 125 with no power band.


Scatter gun approach > thoughts to check out > > >
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.

Hope this helps!

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2 Answers

My 2000 KX100 sputters real bad


check your power valve could not be workong

Mar 31, 2009 | 2003 kawasaki KX 125

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