Question about 2003 Suzuki RM 125

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Engine revs up while idling

When riding everything runs good but stop and let it idle for 5 to 10 secs it revs up check throttle,carb and jets,everthing looks good

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Any stuck cables or jets or vacuum hose leak?

Posted on Apr 26, 2010

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The choke lever on my 03 rm250 wont stay up why and how can i fix it

Posted on Jun 22, 2010

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1 Answer

Briggs Stratton 5hp I/C starts ok, runs, but will not rev


My money is on a partial blockage of the main jet or the passageway to it. You're having to force it to run through the idle jet by fully choking the incoming air. There's not enough gas coming in with the choke open to allow it to run.

I'm thiniking total carb disassembly, carb cleaner and an air compressor combined with a ton of patience will take care of the issue.

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I own a 1990 3cv it increases revs from idle to around 3000 once it has warmed up if I stop the motor for a bit then start it again the revs will do the same I have cleaned out the carbs and replaced


You mean the revs come up even if the throttle is left in idle?
If yes: it means your idle runs too lean AND the carbs aren't balanced ( one gives more air than another )
Unscrew all the idle mix screws 1/2 turn
To balance, remove 1 spark plug lead, check the rev falling.
Replace the lead and remove another one. Check the rev fall etc...
Regulate the carb opening so that all the cilinder disconnects give the same rev-drop.

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07 harley xl1200c. go for a cruise at steady rpm. highway speed. start to slow down and the idle stays high. if i pull in the clutch it really revs up. downshift and it can actually ride me along at like...


Hi Fareseedjr, high idle on fuel injected models can be casued by a faulty IAC valve located on the top front of the induction module. It has either failed electronically and needs to be replaced or mechanically getting gummed by contaminated engine blow by. You can try cleaning the unit by removing the air cleaner and backing plate, unplug, unscrew and remove the IAC. Using carb cleaner and " LOW " volume compressed air to clean the metal pintle and shaft that is spring loaded and has an operating length of just under 1 inch. Aventurous souls who did not heed the low air warning have launched pintle and spring into parts unknown. There is no guarantee this will work but worth a try since a new one is $50 Good luck

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2008 Yamaha Zuma Idle Speed Problems This is a stock 2008 Zuma 50cc scooter with 2200 miles on it that has a high speed surging issue. I can't get this to idle properly. When cold the engine starts...


TRY THIS;WHILE RUNNING SPRAY WD40 ALL OVER ENGINE..MOVE SLOWLY WHILE SPRAYING..NOW IF ENGINE REVS UP MAJIOR VACUMM LEAK....FIX AND BE HAPPY..GOOD LUCK..INDIAN HEAD SHALAC IS THE BEST SEALANT FOR ALL GASKETS AND VERY CHEAP COMPARED TO OTHERS THAT FAIL AFTER GETTING HOT A COUPLE OF TIMES..BUT I WOULD SAY YOU HAVE SOME KIND OF LEAK..THE ENGINE WILL BE SUCKING ALOT OF AIR THRU THIS AREA.PLUS IF IT LOOKS WET AROUND GASKET OR OIL LEAKS FAILING GASKETS..POTENTAIL VACUMM AREA..HOW DID IT RUN AFTER REBUILT..COULD BE SHOTTY WORK..JUST EXPLORING ALL AVENUES..COULD NEED HEAD RETORQUE IF THEY DIDNT USE LOCK TITE..BLUE NEVER THE RED..RED IS PERMANTE NEVER COMMING APART..HOPE THIS HELPS..BUT IF THE WORK YOU HAD DONE IS STILL UNDER WARRANTY THAN GIVE IT BACK TO GET FIXED..

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1 Answer

Engine revs up while idling


Check the Exhaust Valve actuating rod is firmly in it's bush and the actuating arm is screwed to the valve actuator...the diagram on this link below refers.
http://www.cmsnl.com/suzuki-rm125-2001-2005-usa_model16177/partslist/87624.html

Have you looked closely for air leaks between carby and engine, airbox obstructions or wrong sized pilot jet? Choke plunger thread not loose allowing extra fuel to surge through? Try turning air mixture screw IN half turn. The site below has the complete bike in exploded diagrams. Hope this all helps, good luck.
Cheers.

http://www.cmsnl.com/suzuki-rm125-2001-2005-usa_model16177/partslist/

May 10, 2010 | 2003 Suzuki RM 125

1 Answer

While driving the engine stays at 3000rpm for 2sec and drops


hi,just a thought,if you have had two sets of carbs on it and they have been tuned/balanced and still does it,then it is probably not the carbs causing the problem.check your throttle cable,check it is in good condition with no kinks or tight spots,also check it is not jammed between any other component causing a sticky spot,also,check the freeplay in the cable,you should have around a 1/4 " freeplay at the carbs,with the engine running turn the steering lock to lock,the engine revs shouldn't change..s aticky cable can cause the problem you describe.hope this helps...cheers

Apr 16, 2010 | 1990 Yamaha FZR 600

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Won't idle without choke, turn throttle boggs out


have u checked the float hight on the carburator? also make sure ur choke curcuit i clean and free of dirt

Apr 13, 2010 | 2005 kawasaki KLX 125

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Motorcycle shuts off at stop lights


idle screw by sounds off it buddy on the carb will be the idle screw turn this in till it idles at 1000rpm on rev ometre get back to me if its injection d86be27.jpg

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4 Answers

Yumbo motor scooter


Hi and welcome to FixYa,

Appreciate the direct "Ask Me".

Initially, pls confirm that it uses a two-stroke 50CC engine. Additionally, your description "It refuses to rev beyond idle speeds." could indicate several conditions:
  • throttle up above idle speed, engine stalls/dies - fuel related issue, fuel starvation, clogged jets, nozzles, too much 2T oil, contaminated fuel (water). Basically a carb rebuilt;
  • throttle up above idle speed, no change in engine RPM - mechanical problem, possible broken accelerator/throttle cable, stuck plunger in carb, detached needle valve;
  • throttle up above idle speed, engine backfires/dies - electrical issue, check CDI, stators, trigger/pulse, their physical state/mounting, electrical connections;
  • throttle up above idle speed, engine hesitates/flat spot - air/vacuum issue, check rubber coupling from carb to intake manifold, blocked or absent air filter.
Good luck and Thank you for using FixYa.

Pls be informed that due to my current rank and rating, even a Helpful would be detrimental to my status. Should this solution not address your concern, it would be appreciated if you could just not rate it at all. Cheers.

Dec 28, 2008 | 2004 Yumbo Dakar 200

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