Bikemovile
New Member
Hello everyone, first of all I apologize if my English is not very good.
Maybe someone can help me because I can't find an answer to the problem with my bike.
As this may be too long to read, the most important things are in bold, the rest is only less important information that could help to indentify the problem.
I recently purchased a cheap chinese 80cc 2t engine kit.
The assembly was not as quick as I thought it was going to be but finally I'm really satisfied with it.
I think the chain/spring tensioner and the sprocket are really well adjusted.I was very careful in the overall assembly.
As soon as it was ready, refill the tank with 16/1 mix. Then I saw signs that there might be too much oil in the mixture. At this point I couldn't wait to test the bike LoL.
To my surprise it started on the first try without any effort. I was really happy and made a couple of 0.5 mile trips with it, letting it cool down in between.
Then I kept using it that same day and several more days making short trips of that distance or a little more.
Because of my lack of knowledge, I didn't know anything about break-in, so in those uses I may have gone full throttle too much time, although I also used it at half throttle.
Apparently it was working fine, the only thing was that a lot of oil was coming out of the exhaust when I stopped using it.
Now the problems begin:
1 hour after using it without any problem, I start up it and after 300 meters it starts to give some pull and turns off, I can not keep the engine running at idle.
As it was night and I couldn't see anything, I decided to leave it for the next day.
In the morning exactly the same thing happens at 300 meters after starting up without any problem.
Since I have my bike in a different place than where I usually live, I can only use it on weekends.
The next weekend I arrive and put directly a ngk b6hs, I was sure it was a problem of the poor quality Chinese spark plug.
At this point I start using a 40/1 mixture.
The bike works perfectly, I think even better than before, but after a few trips it happens exactly the same as before, only this time it happens after using it less often.
After some research, at that moment I think that the problem is due to a too rich mixture that spoils the spark plugs.
After several days I put a third spark plug, remove the filter foam and make a small hole in the casing.
The bike starts and runs incredibly well, after checking the spark plug, the mixture is definitely not too rich. No more oil leaks from the exhaust pipe but ... the usual problem happens again. After a few short rides, 300 meters after starting the bike it shuts down. I try to put new spark plugs and it doesn't start either, so that's not the problem.
I'm sure that without touching anything, the next day it will start up again and it will work fine several short trips to start again with the same problem.
I just can't figure out what is going on, if I stop using it for a few days the fault resets but after a few rides the same thing.
What part could be at fault for this to happen? CDI?
Thank you very much
Maybe someone can help me because I can't find an answer to the problem with my bike.
As this may be too long to read, the most important things are in bold, the rest is only less important information that could help to indentify the problem.
I recently purchased a cheap chinese 80cc 2t engine kit.
The assembly was not as quick as I thought it was going to be but finally I'm really satisfied with it.
I think the chain/spring tensioner and the sprocket are really well adjusted.I was very careful in the overall assembly.
As soon as it was ready, refill the tank with 16/1 mix. Then I saw signs that there might be too much oil in the mixture. At this point I couldn't wait to test the bike LoL.
To my surprise it started on the first try without any effort. I was really happy and made a couple of 0.5 mile trips with it, letting it cool down in between.
Then I kept using it that same day and several more days making short trips of that distance or a little more.
Because of my lack of knowledge, I didn't know anything about break-in, so in those uses I may have gone full throttle too much time, although I also used it at half throttle.
Apparently it was working fine, the only thing was that a lot of oil was coming out of the exhaust when I stopped using it.
Now the problems begin:
1 hour after using it without any problem, I start up it and after 300 meters it starts to give some pull and turns off, I can not keep the engine running at idle.
As it was night and I couldn't see anything, I decided to leave it for the next day.
In the morning exactly the same thing happens at 300 meters after starting up without any problem.
Since I have my bike in a different place than where I usually live, I can only use it on weekends.
The next weekend I arrive and put directly a ngk b6hs, I was sure it was a problem of the poor quality Chinese spark plug.
At this point I start using a 40/1 mixture.
The bike works perfectly, I think even better than before, but after a few trips it happens exactly the same as before, only this time it happens after using it less often.
After some research, at that moment I think that the problem is due to a too rich mixture that spoils the spark plugs.
After several days I put a third spark plug, remove the filter foam and make a small hole in the casing.
The bike starts and runs incredibly well, after checking the spark plug, the mixture is definitely not too rich. No more oil leaks from the exhaust pipe but ... the usual problem happens again. After a few short rides, 300 meters after starting the bike it shuts down. I try to put new spark plugs and it doesn't start either, so that's not the problem.
I'm sure that without touching anything, the next day it will start up again and it will work fine several short trips to start again with the same problem.
I just can't figure out what is going on, if I stop using it for a few days the fault resets but after a few rides the same thing.
What part could be at fault for this to happen? CDI?
Thank you very much
