Trouble Shooting Guide - Cags - Add yours

This thread is designed to help out all cag owns when they have a problem.
It is a trouble shooting guide where you add your own experiences of problems you have encountered.
Im aiming to get this thread stickied for all to read when they have a problem.

The layout for your post should be similar too this.
Problem:
Symptoms:
Cause:
Resolution:
Cost:

Please keep all posts in this thread strictly informational and on topic.
Also if you see a post made in here and you dont think it is quiet accurate or you would like them to add some more info etc, shoot them a pm explaining your thoughts and hopefully they will fix it up or add what you wanted.

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Problem: Air leak
Symptoms: White/light colour spark plug, bike not idleing, revs change without you touching throttle
Causes: Broken gaskets in carby/manifold/reed block, poorly sealed carby/manifold/reedblock assembly, poorley sealed clylinder to crankcase, broken cylinder gasket, ruined crank seals, torn crank gasket.
Resolution: Find the broken gasket/poor seal and get a new gasket and seal it up.
Cost:Under $10

Ps. You must use silicon gasket goo on both sides of the gasket when reassmbling.

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Problem:Blocked main jet
Symptoms: Bike dying/ stalling at high revs or when you give it some throttle
Cause: Blocked main jet
Resolution: Take the carby off, take off the carby bowl, unscrew the main jet, clean it out with a aircompressor and give it a good clean in petrol.
Cost: Nothing if you do it yourself

Want more info? Use the forum search and type blocked main jet or something similar etc.

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Problem: Coil burnt out/damaged and not working
Symptoms: Irregular sparking, bike hard to start and doesnt run consistantly
Cause: Faulty coil, bad spark plug
Resolution: Get your hands on a new coil and NGK plug, take off the pullstart [3 bolts] take off your old coil [2 screws] put on new coil with a 1mm gap between the coil prongs[whatever you want to call them] and the flywheel.
Cost:Under $40

If you want more info use the search.

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problem: jammed float
symtoms: bike pissing out fuel from overflow
cause:maybe dirt, plastic or some other material in the float bowl
resolution:tap the bottom of the float bowl with screwdriver or sumthing similar kinda hard then if still leaking lift the back of the bike about 15cm off the ground and drop to try and bounce the float unstuck( most of the time works)
cost: nothing

In this situation it would be best if you could remove the bowl and actually clean out the lower part of the carb. This way you wont have any more troubles. (for a little while ) If something got in there something else can too. Upgrade your fuel filter!

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Custom CAG Style Bike
14.5 to 1 compression 5 port head
Run on AV gas
Ported Piston
.005" Copper Base Gasket
Fatboy Exhaust
Balanced FC 10mm Crank
6mm Reed Spacer
BW Reeds
Ported stock carb: 15-16mm straight though,
tapered to 19mm
Jet size approx 80 to 84
Advanced Timing
Lightweight Flywheel

mine wont start and when it does it takes off at high revs ive checked every thing ive checked the spark plug, the carby, jets, piston rings, throttle, fule filter ive checked everything and it still wont start how can i fix it

wrong section to post in

hi i have a 49cc air cooled cag bike and for the last three weeks it has been running fine unitl the last few days. it runs fine for the first 3 or 4 minutes then once it hit full revs it starts to sputter as if it running out of fuel if u take it bak to half accelaration its fine but if u leave it at full revs the bike stalls. but as soon as u pull the starter it starts fine until u hit full revs agian. any help would be appreciated.

I think you just gave yourself the answer;shortage of fuel. make sure hose isnt kinked, fuel filter isn't blocked up. if float is sticking, could limit your fuel availability.if none of these help, maybe the problem is the opposite as in to much fuel for the amount of oxygen getting through your air filter. check the needle and seat aswell for contaminents
These are only my assumptions so better advise might be available shortly
gl
~Haggard~