Hi...
OK.
My first "build"...a 80 cc Chinese kit on an 18" aluminum mountain bike.
After perusing this forum for a few days, and taking into consideration the 'tips', e'g' stonger bolts, careful sprocket centering, rubber under the mounts etc etc...I finished up last night.
Unable to wait until daylight, and against the better judgement of my wife - I set out on the driveway for guts and glory!
We have a quite steep drive, but after 5 or six tries, I could not get the engine to continue to run on its own. The hill part of the driveway is not long though, and probably just before it "started", I was already braking.
Back to the forums this morning, where I read that, particularly on the FIRST start, it may be becessary to pedal along at 10 MPH for quite a few seconds until the engine comes to life. Also, I read that it's a 'tickle valve' that primes the engine, NOT a "pump" (d'oh)...and that 2/3 choke might be enough.
Sure enough, after holding the "tickle valve for 3-4 seconds, and putting the choke lever to 2/3 up...I pedalled like mad on the level, and slowly she began to fire...and then by using full throttle burst into life!
In fact, I had TOO much acceleration for ME (on my 56 tooth sprocket) and backed off, easily keeping up about 15 MPH...the engine was purring along nicely...
...but I got about 100 yards up the drive, on the level, and WHAM! - my chain broke - a peice flying up and hitting me in my smug ass, the rest trailing on the ground, and still wrapped around the drive sproecket.
I have done a search...and cannot find any examples of what might lead to this...my sprockets seem pretty well aligned...the chain tensioner gave me only 1/2 "play" in the chain...I thought I was good to go.
The "good" news if the motor worked...choke, throttle, clutch etc...but the chain failed after 30 seconds or so.
Any ideas? I mean this chain broke BIG TIME, not just one link...here's a pic.
Thanks
OK.
My first "build"...a 80 cc Chinese kit on an 18" aluminum mountain bike.
After perusing this forum for a few days, and taking into consideration the 'tips', e'g' stonger bolts, careful sprocket centering, rubber under the mounts etc etc...I finished up last night.
Unable to wait until daylight, and against the better judgement of my wife - I set out on the driveway for guts and glory!
We have a quite steep drive, but after 5 or six tries, I could not get the engine to continue to run on its own. The hill part of the driveway is not long though, and probably just before it "started", I was already braking.
Back to the forums this morning, where I read that, particularly on the FIRST start, it may be becessary to pedal along at 10 MPH for quite a few seconds until the engine comes to life. Also, I read that it's a 'tickle valve' that primes the engine, NOT a "pump" (d'oh)...and that 2/3 choke might be enough.
Sure enough, after holding the "tickle valve for 3-4 seconds, and putting the choke lever to 2/3 up...I pedalled like mad on the level, and slowly she began to fire...and then by using full throttle burst into life!
In fact, I had TOO much acceleration for ME (on my 56 tooth sprocket) and backed off, easily keeping up about 15 MPH...the engine was purring along nicely...
...but I got about 100 yards up the drive, on the level, and WHAM! - my chain broke - a peice flying up and hitting me in my smug ass, the rest trailing on the ground, and still wrapped around the drive sproecket.
I have done a search...and cannot find any examples of what might lead to this...my sprockets seem pretty well aligned...the chain tensioner gave me only 1/2 "play" in the chain...I thought I was good to go.
The "good" news if the motor worked...choke, throttle, clutch etc...but the chain failed after 30 seconds or so.
Any ideas? I mean this chain broke BIG TIME, not just one link...here's a pic.
Thanks
Attachments
-
290.6 KB Views: 228