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891 Views 8 Replies 4 Participants Last post by  CAM2, 
F
New to the world of pocket bikes. I purchased a used 49cc mini quad from a friend for my son and having problems to troubleshoot why it will idle but not rev up. I believe the motor to be a Cag motor from the decriptions and pictures others have posted? I have read many of the other forums and I have tried cleaning the carb, replacing the plug, gapping the coil. I removed the reeds from intake and tried to see if there are any signs of light between base and reeds. I can't see anything wrong. I am not sure where to go from here.:confused:
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CAM2
When you say it wont rev up...Does it die out quickly or does it bog out slow when the throttle is turned?
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F
It dies quikly. As I slowly open the throttle, the motor begins to pop either out the carb or exhaust. I tried to see if it is a lean condition by spraying a small amount of carb cleaner in the throat of the carb while opening the throttle but this stalled the engine. I also tried partially closing the choke while throttling up but stalled the engine. When I pulled the plug after running the plug is dry so this leads me to believe that the engine is too lean. The gas is new with a 40 to 1 ratio. I removed the carb to see the float level. The float bowl was 1/3 full of fuel not including the float in bowl. Is this the level it should be?
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MathieuOuellette
You might be jetted too lean and the bike is starving for fuel. Is the plug all grey?
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F
Dark gray to black in color. Not sure if anyone rejetted it. Can somebody explain the function of reeds for a two stoke. I have a good understanding of four stroke motors. 2 strokes are a bit of a mystery to me
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CAM2
family guy said:
It dies quikly. As I slowly open the throttle, the motor begins to pop either out the carb or exhaust. I tried to see if it is a lean condition by spraying a small amount of carb cleaner in the throat of the carb while opening the throttle but this stalled the engine. I also tried partially closing the choke while throttling up but stalled the engine. When I pulled the plug after running the plug is dry so this leads me to believe that the engine is too lean. The gas is new with a 40 to 1 ratio. I removed the carb to see the float level. The float bowl was 1/3 full of fuel not including the float in bowl. Is this the level it should be?
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Try changing the sparkplug...Ive had plugs start the engine but die as soon as the throttle is twisted............It also sounds like your float is set a lil too rich ...lean it by bending the float forks away the carb body a tad......You can also lean/richen the carb by raising and lowering the c-clip on the mainjet needle
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F
Tried replacing the plug. I tried raising and lowering float setting.Had no effect. I raised the mixture needle and it seemed to have a little effect. When I lowered the needle, it would not hardly run. Not sure if I should try a new carb. I am 100% certain there is nothing in the main jet. Not sure if I should just replace the carb to rule out the chance of a fuel problem.
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EPR
Have you pulled the reed plate and see if the reeds are sealing on the rubber pads. That is like your valves on a 4 stroke engine. Did you take the main jet out and clean it. Could be as stupid as the gas turn off valve rubber blocking fuel flow from the tank to the carb. Thats why we all do the JB Weld trick.

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CAM2
family guy said:
Tried replacing the plug. I tried raising and lowering float setting.Had no effect. I raised the mixture needle and it seemed to have a little effect. When I lowered the needle, it would not hardly run. Not sure if I should try a new carb. I am 100% certain there is nothing in the main jet. Not sure if I should just replace the carb to rule out the chance of a fuel problem.
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make sure the coil and flywheel magnets arent rusty and regap the coil to the flywheel with a .020" thick business card.....Its possible your coil is crapping out and why the bikes running so badly.....
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