Engine was running fine and the next second it doesn't start.

core2kid

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So basically I had this bike go for about 25 miles. It ran fine, mo problems. Just a hard start on the first start of the day but once it started, it ran like a champ. Today I had to remount the engine on a new frame (Wal-Mart replaced the defective tire and bent the axle at the same time. They wanted the bike back, wouldn't just replace hub.) and it ran fine.

I rode around for about half a mile testing it out, stopping and revving it and it seemed to work. I headed over to my friends house (1/2 mile) and up the hill, the engine seemed fine. On the way down, I held the clutch and the engine died. At my friends house, I put in some gas thinking that I ran out. No luck, it still didn't start. I pedaled back home and I filled the tank 1/2 way with the fuel I used in the beginning. It started but was a very rough ride and then stalled. I started it again, which took about 3 minutes and then held the clutch and revved. It worked fine and revved. I let it idle for about 30 seconds and revved off and on. As soon as I lifted the bike and hit the gas to spin the rear tire, it stalled. Now it won't start again.

Any ideas? I haven't tested the CDI yet but it's had less than 25 miles on it. I'd be surprised if it broke. The carburetor is also mounted properly and leaks out fuel when I open that screw on it. Gas tank drips out fuel fine. (Even tried w/o fuel filter with no luck)

I've heard stories about the coil being bad. Do you guy's think that's the case? Does this seem electrical or an engine issue?
 
I doubt it'd be something with compression since it ran then just stopped and still ran at times. Also since pulling the bike without the clutch engaged is just as hard as it used to be.

The CDI at the settings 20M, 200K, 20K, 2K, 200 under OHM gave a reading of 0. I guess my CDI is dead. Do you think that makes sense?
 
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After I tested the CDI, I put it back together and it started right up and ran fine. I have no idea what the problem was but it seems to be working now. Any ideas what could have been the problem?
 
could be bad connections(came loose or something like that)
If it was my bike i would also change the plug because those chinese one fail really bad(not sure if yours is a chinese or not because you did not said anything about it but the only engines that have a cdi separate from the coil is a HT)
G-Superior:D
 
Are the HT Engines better than the Chinese ones? I bought my engine from a US Seller on eBay.
 
The CDI wires coming loose are a common problem, they use crappy short wires to boot.

I upgrade all my bikes now with my own little custom keylock CDI module add-on.

KeyKit1.jpg


It really shows how sad the stock offering in.

KeyKit2.jpg


Do it yourself part kits, assembled add-ons, and complete ready to drop in units including the CDI coming soon, I have the parts for 50 ;-}

KC.gif
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KC's Kruisers Glendale Arizona, USA
 
The HT engines are the Chinese ones. "HT" is just a quick to type reference to them.
Happy Times as it means.
 
I like the keylock CDI, it's probably something I could end up doing myself, I'm pretty confident in my electrical abilities. As for the connectors coming loose, I ended up tightening them with a plier and electrical taping them together. There's gonna need to be some serious vibration before those come loose again.

I purchased the kit on eBay from a seller called rawmotorsusa. He doesn't have the engine for sale anymore though. The title of it was:
2010 V2 80CC BICYCLE ENGINE MOTOR KIT MOTORIZED BIKE

He is a seller from CA. How can I tell if it's a china engine?
 
Does it look like the in frame engines in a lot of the bikes in the photo section?
 
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