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Discussion Starter #1
ok here we go,:angry::angry: i recently cracked my case so i bought one off ebay and swapped all the guts over installed it in my quad and it started right up but the shift drum wasint sitting in the case right so i took the left cover off fixed it now it shifts fine i started it shut it off put the plastics on and went to start it again and the flywheel fell off i put it back on and it still wouldnt start so i took it off and the key in the flywheel was sheared i put a new one in put the flywheel on set the cam timing where it should be and now it wont start at all its getting plenty of spark and fuel when i try and start it the carb sucks in toward the motor i dont know if thats normal also a little fuel comes out the intake side could the lobes be the wrong way? or what else could be wrong ? ive just about had it with this quad but after all ive done with it recently id hate to give up now but im stuck i dont know what the hell to try now
 

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this might be a stupid answer but it happened to in the middle of a ride bus check the connection on the spark plug i had to get towed out of the bush [about a mile] and we went over a lot of stuff only to find the boot wasent on good enough
 

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Discussion Starter #7
when i bought the quad it had a small crack in the case around the chain i put jb weld on it the first time i rode it i hit a jump and the chain snapped and the crack when all the way around the left case so i just replaced it ill check the timing again tomorow but im pretty sure it was right on and i messed around with the boot as i was trying to start it i dont think its that
 

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Discussion Starter #8
the piston was in backwards now its right i had to replace two valves it has much better compresion now but still wont start
 

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This reall sounds like a timing Issue if you have spark and you have fuel physics say it will run try something go to the left side of the quad (shifter side) look for a gray wire and a gray/black wire. one of those leads to the other side of the engine under the brake pedal lever ...ok... where that wireconnects to the harness unplug it from the harness make you a jumper wire about 2" long strip both ends now on the harness connect that jumper to the gray coming from the CDI box and the gray/black. try that and see if it will start. be sure the red switch on the bar is on and the key.. oh and hold in the clutch... it will start in reverse now.
 

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Discussion Starter #10
ok i tride that the red reverse light came on but the bike wouldnt even turn over the key was on on and i held down the clutch
 

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There are 2 or 3 gray wires coming from the harness I'll have to look on my quad try the other one... one activates the light the other leads to the CDI and I think the other goes to the resistor the wire with the light may have a "Y" connector I'm not sure. let me look this afternoon on my 250 and i can tell you.
 

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Discussion Starter #12
ok ill look at the wire diagram in my manual also i checked my oil today somehow it was double what should be in there so i drained half my battery was dead so i couldnt try it yet but could that have somethingg to do with it
 

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Discussion Starter #14
ok i made some progress today i think i took off the top end i cleaned the piston rings and all the carbon build up off the piston put it all back together set the timming tride to start it same as usual so i sprayed starting fluid in the carb it sounded like it wanted to start so i tride that for about a half hour with nothing so i took off the carb and sprayed it in the hole for the carb and it started for about a second so i put the carb back on sprayed it in the carb still the same as before so i took off the plates on my pipe i have a fmf power max or something like that so now the exuast is upened up i tride the starting fluid in the carb again and it started it ran for about a min maybe a little less i havent tride agian since i dont want to mess anything else up do you think it will be fine now if i let it run for a little bit or what could still be wrong with it? i also cleaned the carb it seams to be spraying out better now too
 

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No but I would be careful doing that.... Have you actually disassembled the carb and cleaned every part in it.?
 

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yeah sounds carb related. Did you clean your jets out really good? Like take them out and blow high pressure air thru them?

What about when the chokes on will it start while you hold the gas lever all the way down while cranking it over? If its cold outside(below 40) I have to do this with mine, or it wont start at all.

My 250 kicks over and starts good, but for some reason the 300 I have is very cold natured.
 

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Discussion Starter #19
i took the bottom off and and took out the two brass pieces and blew thru them i didnt really go through it that good, before all these other problems the carb was working fine i dont know too much about carbs i had one of my buddys over a couple weeks ago when i was trying to figure out why it wasnt starting he looked at the carb and said it was working fine when i pulled the throttle the gas whould come out in a mist i remember on my old two stroke bike it would shoot out in a stream i dont know if its diferant for four strokes hows it supposed to come out? ill be pretty pissed if i did all this work these past couple of weeks when it was the carb all along allthough ill be very happy when its running again
 

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Not sure what you've done I'll just ask some basics.

Did you set the lobes of the cam facing down when you put the timing gear and chain on and line the gear marks up parallel with the top of the head? Also was the flywheel lined up on the T of the F and T side?

When you set the timing did you set it on the flywheel side where there is an F and a T or just the side with the T? You need to set the flywheel with the F and T side. The single letter side is 180 out.

Also if you said gas was coming out the intake, you might not have set your valves properly (or if you did the step mentioned above improperly)causing them to never close or open fully.
 
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