it wont idle By todamgdlok (Read 896 times)

[todamgdlok]

hi i live in vegas so getting parts is easy but right now im not working so i got the 80cc kit ported the head and laped the valves myself opened up the jet little by little till it was burning right it had a 84 in it i also opened up the muffler sawed it in half drilled it so it goes stright thru filled it with steel wool to keep the noise down i still need a uni filter, cdi, and ethier a torq spring or lighter sliders to get the rpms up to the power band i dont know how good the speedo is but it will climb a hill from 0 to 45 mph and on a stirght away it will peg the needle well past 55mph and im 230lb its a vip sport qmb139 50cc i got it for $65.00 had to buy muffler $45.00 and i got the bbk form srappydogs for $49.00 plus tax had to rebuild carb 3 or more times clean tank freind had a batt. for a harley so i had to mod the batt box to fit the oversize batt but it was free and it has 25cca ok now that i have givin you the rundown when it warms up it idles better but its wont stay idleing it will rev high then low then stall ive tried setting the idle higher but it does the same only it revs higher then low then stalls it was worse before the mods also notice it idled better when i put high octaine gas in it sorry im not the best speller

[Alleyoop]

It is running LEAN, richen the AIR/FUEL mixture up, if it surges at Idle that is your problem.
Alleyoop

[todamgdlok]

air/fuel mix screw? or open the jet more? also i didnt have a feeler guage so i used a flexable razor to set the valves could that be part of the problem

[Alleyoop]

Here is a picture of my carb you see the Air/Ratio screw that controls the amount of Fuel coming from the Pilot Jet. If you turn it Counter Clockwise it allows more fuel if you turn it Clockwise it allows less fuel.
What you want to accomplish with the setting is to get the HIGHEST IDLE out of the adjustment.
1. Turn it 1/4 Turn Counter Clockwise wait 10-15 seconds so that the engine adjusts to the new setting.
a. If the IDLE goes up REPEAT 1, when the Idle doe not go up anymore Turn it Clockwise 1/8 and that should be your highest IDLE out of the Fuel Mixture screw GO TO 2.

**** IF ON THE FIRST 1/4 TURN COUNTER CLOCKWISE the Idle does nothing or IDLE GOES DOWN Turn it Back the 1/4 Turn and then DO 1 BUT CLOCKWISE.****

2. Now set your IDLE using the IDLE SPEED SCREW to around 1500-1800.

Now give the Throttle a QUICK Bleep the Engine should REV up without Bogging or Hesitation and come down to where you set your IDLE at.
Alleyoop

[justguy1]

How can you adjust this if the scooter doesn't stay running?? Is there a way to give it more fuel with the scooter off??

[sprocket]

>>>so i used a flexable razor

ahhhh ya! That could be part of the problem!


>>>How can you adjust this if the scooter doesn't stay running??

You can't. That is why you turn the screw out 2 1/2 turns. This should put you in the ballpark.
The scooter must have been run for 5 minutes, so it is off the enricher before this adjustment can be made...