fuel in bottom of engine leaking into magnito

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CdubLu33

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May 22, 2013
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Southern Maine
My bike has been running funny lately. I thought it was water in the gas by the way it was running so I put new gas in it, no change. The next day it got worse and wouldn't run at all, no spark. So I took off the magnito cover and out poured a gas water mixture. Confused as to why I had gas in there I took the engine off the bike to see what's going on, and found that there was a lot of gas in the bottom of the engine leaking into the magnito case. How can I fix this? Has this happens to anyone else?
 
Your carburetor needle valve may not seated properly or your carburetor float has a hole in it allowing fuel to enter the engine. Check for these problems first.

Then, air out the engine, try removing the spark plug and letting the engine air out. Or you can disconnect the black and blue wires from the CDI unit, remove the spark plug and peddle the bike to air out the engine case. ***You don't want your CDI connected to the magneto or you might ruin the CDI***

It is important to turn the fuel off when you park the bike, especially if you park it in a garage with a water heater or other source of combustion.

Good Luck,

Chris
AKA: BigBlue
 
the needle valve in the carb is leaking,

and for the fuel to get into the magneto...

the magneto side crank seal has bust...as usual...easy repair. pop the magnet, shove in new seal (or old seal thats fine but been popped out if lucky)...
 
Sounds like you have a failed crankshaft seal on the magneto side of the crankcase.

For a newbie, it's not an easy repair (if the seal hasn't popped out) because you have to try and pick out the crankshaft seal without damaging/scoring the area where the seal contacts the crankshaft and/or the area where the seal presses into the crankcase.

If you score/damage the crankshaft surface, you are totally screwed because the engine needs to come out of the bike; with the engine requiring a total strip down to replace the crankshaft.

From what it sounds like, the engine needs a new crankshaft seal. Hopefully you have an engine design which uses a thick seal rather than the less common "thin" design.
 
my bike has been running funny lately. I thought it was water in the gas by the way it was running so i put new gas in it, no change. The next day it got worse and wouldn't run at all, no spark. So i took off the magnito cover and out poured a gas water mixture. Confused as to why i had gas in there i took the engine off the bike to see what's going on, and found that there was a lot of gas in the bottom of the engine leaking into the magnito case. How can i fix this? Has this happens to anyone else?

if yoou got moisture in the magneto id have one on standby anyway..or tak eit out now and clean it and even resolder the joints, they fai from vibtration rather easiy i have a few go bad on me.....my first bike i didnt even break in ..i took it to about 40 by the second tank and by the 3 and 4th tank i was doing near 60...with just few minor upgrades...so i know where im headed !!! You reay can get so much out of these engines!!!
 
TO BREAK IN OR NOT TO BREAK IN ...THAT IS THE QUESTION..... no need i say!!

60 miles per hour or 60 kilometers per hour?

km/h australia so we go by kms..soooo fast

also with my first bike which is now running stronger then ever, after sitting for about 2 months straight for i was gobsmacked about what was wrong wouldnt fire...changeed the magneto coil and walah!!!! i honestly thought my engine blew....but to my surprise it was just the magneto coil....thisis a major issue on most 2 stroke engines..secure this part!!!! anyhoo...so i first started doing about 25-35 first go...and by second go i ws already doing 35-45..and then by the end of the 2nd tank i was doing 60 down hills.....i also just liek to add....at the start...it was standard...then by 2nd tank i put a 3prong plug....a hd CDI and spark plug lead.... nothing else so far and it was doing 60nicely and consitently down hills.....but on ave it would cruise at 50-55.. now thast with no break in.... so i ask do u break in a lawn mower?...same principle///.. ? im not trying to be smart..its kinda like a opinion only mine! but wouldnt mind some advice or ffeedback
 
by the end of the 2nd tank i was doing 60 down hills...

A gravity assisted speed (as you have described and in km/h) sounds much more believable. There are some on here who claim 80 km/h (on flat ground) and do so with their hand on their heart; trying to convey looks of pure sincerity, whilst doing nothing more than placing a piece of plastic pipe over the air filter, bent to face into the wind and then gutting the muffler internals for that little bit extra; (but giving precious little power improvement) other than making one hell of a racket; not to mention upsetting everyone in the neighbourhood and also those who question the calibration of the speedo and the levelness of the road.
 
A gravity assisted speed (as you have described and in km/h) sounds much more believable. There are some on here who claim 80 km/h (on flat ground) and do so with their hand on their heart; trying to convey looks of pure sincerity, whilst doing nothing more than placing a piece of plastic pipe over the air filter, bent to face into the wind and then gutting the muffler internals for that little bit extra; (but giving precious little power improvement) other than making one hell of a racket; not to mention upsetting everyone in the neighbourhood and also those who question the calibration of the speedo and the levelness of the road.

ye your right, creating a racket for notmuch power gain is a waste, thast why all ive done is the plug lead, 3 promg plug, and cdi and it flys, after the exhauhst and sprocket to 33 or 36 should go almost 70kms/hr on flat ground i was doing 50 easy consistenly...and down hill would go 60 62 max....so im hoping with the sprocket down to 36 should go about 70....maybe..... also forgot to mention i only have a speed carby on here now and havent trested it full throttle yet...just installed it yesty..will give it a go soon...... just wanted to add that i prettt much opened fullthrottle on at the start of the dsecond tank ...and still goes strong.....
 
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