I'm really just guessing what's wrong at this point.
I'm the proud owner of a Motobravo Super Hornet 150cc with 422 miles on it.
On 4 occasions it has stalled out, I thought it was my error. All 4 times, I was at or near full throttle for several moments, when I felt the engine change.
(sorry, can't give detailed observations - this happened in traffic so I was focused on staying safe)
It seemed to be sort of in neutral - I think a couple times I did release the throttle then rev back up, and the engine revved but the bike continued to decelerate. This is an automatic transmission. Not completely sure about this though - I was coasting to a stop and focused on getting out of traffic without getting hit.
Anyway the bike just decided on its own to slowly (maybe 6-10 seconds) go from full throttle down to idle. Then it stalled out.
I was able to get it started pretty easily. The first time it just started right up like normal. I let it idle a moment and everything seemed perfect, so I let it warm up further as I checked traffic, and continued on my way.
By the way that was at maybe 250 miles on the odometer the first time it happened. Also that first time, I had gone from full speed to abruptly letting the throttle go, to let an aggressive driver merge in front of me. I thought I'd made it stall by changing too abruptly or something.
Since then each time it seems to get worse. It's harder to start back up. The third and fourth time I had to give it some gas while cranking it to get it to start. The fourth time it got started, then died, then after a few more attempts, it stayed running just fine.
So I've thought this was all my error, I wasn't handling it right.
Then yesterday was a 5th incident that's probably related:
I was going at maybe 80-
% throttle and it died again. I looked at the tachymeter and it slowly went down to idle, stayed there for a few seconds, sputtered and died.
I tried to get it started and couldn't. Then I noticed that gas was dribbling out of something that looks like some kind of pressure relief port. It's near something I think is the vapor seal. I'm guessing I might have dribbled like half a cup/250ml of fuel total. When I was trying to start it while giving it gas, it leaked fastest.
While waiting for a friend to come pick me up, I guessed maybe I flooded the engine. So after ten minutes without doing anything with the bike, I tried starting it like normal (no throttle.) It started fine, then quit after 3-5 seconds. I couldn't get it to start a second time. After I got it to my friend's house, I did the same thing - cranked it and it started right up then died.
Any ideas where to start?
I've just begun googling, and it seems that others have had possibly related issues with a new bike of the same model. Maybe it's some kind of carburetor adjustment, vacuum seal, or something? it's hard to tell, it seems people post a problem, fix it, then don't come back to the thread and say how it ended and what the solution was. So I'll definitely come back and say. Meanwhile, any thoughts would be appreciated. Thanks.
% throttle and it died again. I looked at the tachymeter and it slowly went down to idle, stayed there for a few seconds, sputtered and died.
?
