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Scooter problerm Hi I just bought a speedfight 50cc and I have hardly any power I have had it a part right down to the piston rings cleaned the carb new spark plug new air box new throttle cable new piston and rings and yet it stays at 20 mph can any one help please as I ran out on ideas

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Isnt there still restrictors on it, normally on peds they may have a washer in the exaust ristricting the exause gasses causing pressure, or they have a washer on the variator to stop it fully opening under throttle, also on the back of the variator check the rollers as you may want to get diffrent weighted ones, but check a performance website for that mate

Posted on Jan 18, 2013

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 3567 Answers

SOURCE: honda 1300c backfire through carb at wide open

Try balancing ans syncronising the carbs.
BALANCE THE CARBS
Turn the throttle screw on the LEFT carb one half turn inward. Now start the engine and get it warmed up. With the engine running, remove the RIGHT spark plug wire. Adjust the idle speed on the left carb to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.

Now turn the throttle screw on the RIGHT carb one half turn inward. Restart and rev the engine. Next, remove the LEFT spark plug wire. Adjust the idle speed on the right carb to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.

Turn the idle screw on each carb EXACTLY ONE QUARTER turn outward and restart the engine. The engine will be probably be idling very fast. Adjust both the idle screws equally from this point to get to the desired idle speed.

SYNCHRONIZE THE CARBS
Remove the air filter and rubber fittings to allow you to see into the throat of both carbs. You may need a mirror to see inside. You need to be able to see the slides go up and down when you twist the throttle. Now turn the fitting where the cable goes into each carb such that there is just a bit of slack in the cable, 1/16" is plenty. Lock ONE of the cable adjusters down tight. All further adjustments will be made on the other carb.

With the motor turned off twist the throttle very slowly while looking at the slides. Both slides need to begin lifting at the exact same moment. If the slides don't raise at the exact same time then slowly twist the throttle until the locked adjuster slide just barely starts to move. Hold the throttle still and turn the adjuster on the other carb so that the slide on that carb just barely starts to move also. Now recheck the slide movement timing. Do this process until the slides on both carbs begin to raise at the EXACT same moment. Lock down the loose adjuster and re-check the slides.

Please rate this solution. Thanks!

Posted on Mar 30, 2009

ginocussen
  • 216 Answers

SOURCE: belt on scooter keeps breakin

Most adults have excellent records of never breaking a belt. Here is the reason why many kids break their belts,--- If you hop a curve, you must let go of the throttle. DO NOT have the throttle on wide open (full open) and hop a curve. If you do when the rear wheel comes off the ground, the rear wheel spins faster. When the scooter lands and the rear wheel hits the ground, you stop the tire from spinning, it will snap the belt. If you do hop a curve, let go of the throttle. When you land give it a little throttle. As you pick up speed then give it full throttle.

Posted on May 14, 2009

Techjoel
  • 79 Answers

SOURCE: 2003 Geely 50cc Moped wont start without starting fluid.

Both types would use fuel enrichment to make the fuel/air mixture richer for cold starts. Motorcycles deliver extra fuel to the intake through small holes in the intake bore when the choke is activated. When cleaning, use something soft like a plastic broom bristle (not metal wire) to avoid scratching the inside of the jet or passage.

Good luck,
Techjoel

Posted on May 25, 2009

  • 47 Answers

SOURCE: Bogs down at 50 mph or over

this is an air intake problem check the air filter is clean also check air filter is the same model as original as some air filters require a carb retune to function properly


hope this helps

Posted on Jun 17, 2009

  • 375 Answers

SOURCE: 1989 Zuma, just rebuilt carb to OEM specs, turned

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Posted on Jul 01, 2009

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