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Post by deivydasrnr on Jul 16, 2014 16:58:14 GMT -5
Hi guys again! So today my scooter died 4 times, and I don't know what's wrong with it, I started the scooter up as always, it warmed up for five minutes on idle, then I started driving, drove maybe 10km max, then I was going WOT at 70-80km/h and the scooter started dieing, I was holding WOT but it sounded like it wasn't getting fuel or something, I stopped at the side of the road, tried to start it - nothing, it didn't start. I took maybe 5 minutes for it to cool and and then it started, got up to 80km/h no problem.Then the same thing happed three times the same day, just that it took longer for it too cool down, the third time, the scooter stood for maybe 2hours, I started it, on the stand it was all good, revs go up to 7-9k, from no throttle to WOT on the stand the revs go high, but when I took it off the stand and tried to drive with it, it died, it sounded more like a flood. The fourth time the same thing happed and I had to push the bike back home. I changed the spark plug and everything looked great, drive maybe 7km and it was all good, I left it to stand for an hour, took it again and went to my friends house (4km drive) everything was fine, we checked the compresion, slightly low but still does the job - 6bars, the scooter stood for an hour again, and I couldn't start it, when it did start, if I gave it more than 1/2 gas it would die, after the fourth time, it started up, on the stand everything looked good, gave it WOT, 9k-10k rpm, I took it off the stand, drove on to the street and it died, we charged the battery, checked the compresion 6bars again, one thing that my friend father didn't like was that the spark plug gap was maybe 0.2-0,25. I raised it to maybe 0.30-0.50 and then it started and I got home with no problems. What should I check tomorrow and what could be the problem? Bad spark plugs? Spark plugs get clogged? Bad coil? Some problems with oil? Electric Enricher maybe? The scooter is a 2009 Gilera Runner, 2008 Piaggio 49cc engine. Thanks in advance!
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Post by chehystpewpur on Jul 16, 2014 17:57:10 GMT -5
Check compression when its warm vs cold. Possibly the cylinder is expanding more than the piston and rings can make up for very possible if they are different metals. Jetting could be a hair off or a gasket could be failing and when it warms up everything expands and the gasket splits. Crank seal or cylinder base gasket could have very little effect on the primary compression but would kill crank case pressure and waste the air fuel and oil trying to get to the cylinder. Dirty air filter could be flooding due to more of a load driving it vs on the stand. If you have an intake manifold on that engine it could be leaking at that gasket. Or possibly even the exhaust. That made my minarelli do the same thing. Exactly same thing. High miles long periods of sitting too much oil or ran to hot could all ruin an exhaust for a 2 stroke. Even a small rust hole or one of the pipes being partially blocked could cause it to overheat alot because the exhaust is extremely important on these things. Also check plug color that can tell alot. Not just the very tip by the electrode but down inside the plug too. Thats the good stuff. Electrodes can make their selves change color just from the heat of the spark and give false readings.
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Post by deivydasrnr on Jul 17, 2014 10:38:01 GMT -5
It happened to me today as well, I drove 2-3km , left it to stand for an hour, warmed it up slighty for five minutes, then after 1-2km the scooter died, quickly i changed the spark plug, same thing, if I try to start it off the stand, it doesn't even start, if I start it on the stand, I can rev it up to 11k rpg, but when i place it on the ground when running it dies, place it on the stand, give it some gas to get to 7k anr quickly go off the stand, it drives for 20meter and dies, I can do this repeatedly. I'm getting 6bars compresion, could it be an overheated cylinder or piston rings?
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Post by chehystpewpur on Jul 17, 2014 12:42:10 GMT -5
It happened to me today as well, I drove 2-3km , left it to stand for an hour, warmed it up slighty for five minutes, then after 1-2km the scooter died, quickly i changed the spark plug, same thing, if I try to start it off the stand, it doesn't even start, if I start it on the stand, I can rev it up to 11k rpg, but when i place it on the ground when running it dies, place it on the stand, give it some gas to get to 7k anr quickly go off the stand, it drives for 20meter and dies, I can do this repeatedly. I'm getting 6bars compresion, could it be an overheated cylinder or piston rings? Are there any binds or kinks in the fuel line or vacuum line if it has one for fuel? The engine moves a lil between stand and ground. I had too short of a fuel line before and it would do that sometimes or just pop off when I hit a bump one time. Luckily the bump was leaving my driveway. |
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Post by deivydasrnr on Jul 17, 2014 13:04:41 GMT -5
The fuel line is okay, no leaks, and it only happens when it gets warm so im thinking overheated piston rings
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Post by chehystpewpur on Jul 17, 2014 17:23:17 GMT -5
The fuel line is okay, no leaks, and it only happens when it gets warm so im thinking overheated piston rings It could be a possibility. Check compression when the engine is hot and just died out. Right when it does and you hop off try the kick starter with your hand see if it feels different from when you try and spin it with your hand when cold. I had a helluva time trying to troubleshoot when I bought my bike but it was just the exhaust. I check everything and it seems like your in the same boat almost. Try and take your exhaust off if you can and clean it out. See if it helps any. Thats one thing that doesn't hurt to try. If it runs better or even somewhat least you'll know what it is. |
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Post by chehystpewpur on Jul 17, 2014 17:24:46 GMT -5
Also I forgot to ask again. What color is the spark plug. Can you take a picture of it? The tip and down inside it past the tip? That can tell us alot and give a better idea.
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