Question about 2008 Yamaha Zuma

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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 right up and sometimes revs high enough for me panic and to shut it off before it takes off on its own. Other times I can get it to idle slower but when you open the throttle while riding it sometimes goes into the high idle condition again. It goes about 25mph when this happens. I have to blip the throttle a few times to get it to stop. No amount of idle speed screw and or idle air screw adjustments will stop this issue. If I adjust the idle speed screw down eventually it will stall out. I have cleaned the carb and removed the jets to clean them out also. Blowing air through the jets and making sure that then are not plugged. Removing the connector to the electric choke has no effect it still idles erratically warm or cold. Mechanically the throttle slide action is smooth and the throttle returns to the hard stop when released. This high speed idle condition can also go off oni ts own without using the throttle at all. Warm or cold it suddenly starts revving like the throttle is being moved to 1/2 open. I can't safely ride this thing or allow others to ride it at this time. I hope that I have given enough information. Please help!

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  • 75 Answers

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..

Posted on Apr 05, 2015

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

SOURCE: Yamaha DT 125 1986 - High Revs when idling

i would say the answer from polar cycle is good...but if it is not the case....you may take a look at crankshaft seal..sometimes the primary compression is not good if cranks seal leaks and it make the bike running lean in gaz and having you're idle getting up sometimes.........check the transmission oil if its low in quantity even after replacing it recently (this means that you're transmission oil is getting burn by you're motor) and also remove the magneto cover to see if there is gaz accumulation in that area...if so that means the seal leaks on the magneto side.....

Posted on Aug 15, 2009

Testimonial: "After finally rebuilding the carbs and replacing the reeds and air filter, the problem was actually solved by replacing the crank seal. "

  • 1 Answer

SOURCE: Strange thigs about YAMAHA TW 125

Hi
I have been working on my carb today,the pipe from the bottom of the carb should just run down by the bottom of the swinging arm,there should be another pipe from the pipe on the left side of the carb just above the fuel intake which also runs down to the swinging arm and connect to nothing.
Cheers

Posted on May 30, 2009

ollie reece
  • 1167 Answers

SOURCE: wont idle

lol buddy if its not idling turn the idle screw in until it idles get back to me if no difference 2ee8c57.jpg

Posted on Sep 30, 2009

  • 8404 Answers

SOURCE: Motorcycle idles up to 3,600 rpm warm at stops ,

Did you do the work on the carbs? Do you have the equipment and expertise a pro uses to balance the carbs? If you had this done by a pro, take it back amd make them fix it.

You are right, this is dangerous and expensive. I suggest you have a Yamaka shop take a look at your motorcycle.

Posted on Apr 28, 2010

heimlich
  • 1978 Answers

SOURCE: I have a 2002 Yamaha

Air screws can be altered slightly for your elevation. Stock setting is for sea level conditions. Example if all your riding is at 1000 ft elevation maybe your standard setting should be 2 and 1/8th turns. I suggest you try resyncing your carburetors. One or more of your carburetors may be set too high or too low , causing the slow return to idle. As you adjust your carbs remember to keep resetting your idle to the recommended RPM. If you decide to try a different air screw setting be sure to double check all you intake manifolds for cracks or separation from the flange, air leaks will also effect your idle. Altering the air box can effect your carb intake vacuum (vacuum carbs are sensitive to this.).

Posted on Sep 07, 2010

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