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Post by rabbitpower on Aug 6, 2011 12:32:48 GMT -5
This has happened 2 times now. I will be cruising along at full throttle and the engine dies. The first time I heard a faint pop and just coasted off to the side of the road. I hit the starter and the scoot fired right back up and ran like a champ. No issues for the next 1000 miles. Then, yesterday I was moving along and i felt it loose power, like I hit a large headwind. It slowed and then the engine just cut out slowly. I coasted to a stop and tried to restart but it just cranked. I let it sit for 5 min and then it restarted. I pulled the plug and replaced it, as well as the cap with an NGK. Any ideas on why its doing this?
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Post by 90GTVert on Aug 6, 2011 16:58:52 GMT -5
:welcome:
Sounds like maybe a soft seize. It could need a little larger main jet. How does the spark plug look after a bit of riding?
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Post by rabbitpower on Aug 6, 2011 19:12:27 GMT -5
I pulled the plug and it was a carmel color...looked pretty good. The engine is deregulated, but completely stock. I guess I could pull the jet and go up one size but i thought the stock jet was fine as long as no mods were done?
What exactly happens on a soft sieze?
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Post by 90GTVert on Aug 6, 2011 21:00:26 GMT -5
Usually the stock jet is fine on a stock scoot, not always.
A soft seize is when the aluminum piston heats up (most commonly from a lean condition) and expands faster than the iron cylinder. Usually you're just riding along and it dies out. Sometimes it restarts immediately, sometimes it takes a few minutes to cool down before it will start. I caught a soft seize on the vid below.
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Post by rabbitpower on Aug 8, 2011 11:50:34 GMT -5
It never happens on cool mornings, only sunny afternoons after a long full throttle run.
Will a larger jet solve this?
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Post by 90GTVert on Aug 8, 2011 12:04:43 GMT -5
That definitely makes it sound like a heat issue and more fuel will make it run cooler. Make sure the fan and air shrouds are clear.
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Post by 2strokd on Aug 8, 2011 12:33:13 GMT -5
If this scooter is stock or close. Ide bet it is getting hot too. Have you tried moving the needle clip to a richer position? A leak test might not be a bad idea. I had a very small air leak once that hardly effected the performance around town, stoplight to stoplight. But if i took it on a long WOT stretch it softseized on me.
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Post by reveeen on Aug 8, 2011 16:27:00 GMT -5
On a stock scooter, with good plug colour, I'd bet money on a vacuum petcock going bad.
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Post by rabbitpower on Aug 8, 2011 18:46:11 GMT -5
Yeah, plug looks great. Its not spotty or white. If the scoot idles for 3 or 4 minutes it starts to smoke so i know its getting oil. I go through a liter of oil in around 400 (+- 75 miles) I don't know if thats normal or not, what do you guys think?
How many times can you softsieze it w/out scoring the cylinder and ruining it? This scoot sees at least 25 miles a day full throttle. I have put 2200 miles on it in 2 and half months.
If the piston siezes, won't it momentarily stop the rear wheel or doesn't a CVT work that way?
Can i richen the carb by adjusting the air fuel? How hard is it to move the pin on the needle?
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Post by rabbitpower on Aug 8, 2011 18:52:49 GMT -5
I just watched the vid. Mine does not die so abruptly ( It can take a few seconds) but the result is the same.
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