Post by axyb on Jan 24, 2022 8:05:53 GMT -6
Hello,
I have a Chinese 50 scooter with 4-stroke electric injection
It breaks down 90% or 100% of the time when the engine is hot, usually after 2/3 hours of riding with it. The more I ride it, the more I know that the breakdown is approaching; I can hear it by the noise when I'm on the idle while waiting at the red light: there are drops in speed/sometimes the speed increases almost as if the scooter wanted to run away; you can hear the engine jumping too. It's a mix of all that.
When I break down, sometimes it restarts instantly with the choke and by playing with the throttle; sometimes I have to wait between 20 min and 1 hour and it ends up restarting by playing with the throttle and still with the choke. It's about 50/50.
What I did :
- spark plug
- rollers, belt, variator cleat
- valve clearance adjustment
- ignition coil test
- test injector that spurts correctly
- pump test
- new air filter / I even removed a flange from the air box
- cold idle screw adjustment
What I think:
- it should not be an electronic failure because it is 90% of the time when the engine is hot; if it is an electronic problem it would be 90% of the time random as a failure. Cold, warm or hot. After that I could be wrong too.
Other details :
- Just after the breakdown, once restarted, it usually doesn't idle, I always have to put the gas pedal back on to avoid it cutting out. Then this problem disappears and it makes me strong increases in speed always at idle at the red light then after a few km it returns to a regular speed calmer but still not very "smooth" or correct.
- Also I can't start with the kick; my kick has never really been used and worked properly, we'll say that it works but when it wants; and not on this failure anyway.
- apparently it's not the ecu / electronic injection box
- I was told the valve sealing but probably if that was the case I would also have failures in the acceleration phase apparently... after I was also told that it was not always the case for the acceleration phase...
(If you can help me please use simple words cause I'm not english native)
I have a Chinese 50 scooter with 4-stroke electric injection
It breaks down 90% or 100% of the time when the engine is hot, usually after 2/3 hours of riding with it. The more I ride it, the more I know that the breakdown is approaching; I can hear it by the noise when I'm on the idle while waiting at the red light: there are drops in speed/sometimes the speed increases almost as if the scooter wanted to run away; you can hear the engine jumping too. It's a mix of all that.
When I break down, sometimes it restarts instantly with the choke and by playing with the throttle; sometimes I have to wait between 20 min and 1 hour and it ends up restarting by playing with the throttle and still with the choke. It's about 50/50.
What I did :
- spark plug
- rollers, belt, variator cleat
- valve clearance adjustment
- ignition coil test
- test injector that spurts correctly
- pump test
- new air filter / I even removed a flange from the air box
- cold idle screw adjustment
What I think:
- it should not be an electronic failure because it is 90% of the time when the engine is hot; if it is an electronic problem it would be 90% of the time random as a failure. Cold, warm or hot. After that I could be wrong too.
Other details :
- Just after the breakdown, once restarted, it usually doesn't idle, I always have to put the gas pedal back on to avoid it cutting out. Then this problem disappears and it makes me strong increases in speed always at idle at the red light then after a few km it returns to a regular speed calmer but still not very "smooth" or correct.
- Also I can't start with the kick; my kick has never really been used and worked properly, we'll say that it works but when it wants; and not on this failure anyway.
- apparently it's not the ecu / electronic injection box
- I was told the valve sealing but probably if that was the case I would also have failures in the acceleration phase apparently... after I was also told that it was not always the case for the acceleration phase...
(If you can help me please use simple words cause I'm not english native)