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Post by alleyoop on Aug 13, 2014 20:32:12 GMT -5
Did you get a performance CDI? those have FIXED ADVANCE timing and it may be to advanced. But like I said check Align the Cam Sprocket and then take a look see at where the timing pointer on the case is pointing to on the flywheel.
If your off 1 tooth that is approx 10% and with a advanced CDI your pretty off.
Alleyoop
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Post by bigmac on Aug 24, 2014 19:59:21 GMT -5
I didn't see anything about it being a performance CDI. The CDI box I got was advertised by the seller as an OEM part. Though I don't know if "OEM" even exists when it comes to Chinese bikes. Should be "CEM" (Copied Equipment Manufacturer). Seriously, Chinese scooters are like the wild west of the bike world. I got head gaskets that differ, different size valves that also require different types of rocker arms. My new CDI box has a rubber holster for mounting it to the frame, but it's a different size than the holster on the old CDI and doesn't fit on the frame's metal tap, ridiculous. I will never get another Chinese made bike again.
Anyways, I took the bike out after adjusting the valves and cleaning the air filter, and it still won't idle, occasionally backfires and looses power and stalls at times.
The markings that indicate the engine is at top dead center on both the camshaft and flywheel appear to be in alignment at the same time. Is it possible that the flywheel may have shifted ever so slightly and is causing problems?
I have done a lot of valve adjustments. While getting the engine into top dead center for an adjustment, I use a socket wrench to turn a 13mm hex shaped piece that's on the center of the cooling fan. The cooling fan is attached to the flywheel. Maybe turning the engine over with the wrench caused a tiny shift in the flywheel's position on the crankshaft? Though the flywheel does feel snug and not about to move without moving the crankshaft with it.
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Post by seamus26 on Aug 25, 2014 6:26:57 GMT -5
I know that you've mentioned your air/fuel mixture is correct, but have you tried something as simple as rejetting the carb? I know someone mentioned earlier looking for sediment in your float bowl. I'm a big fan of Sea Foam, but I've never used it in my scooter. I used a little drygas once and it caused me all sorts of headache.
If your bike ran well after the top end rebuild, you might want to pull that carb apart and really clean it out. I had all sorts of gunk in the bowl and plugged jets after the drygas incident, and it took me a few tanks of gas and a couple of carb cleans to get everything flushed through. I had similar symptoms.
Just my 2¢.
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..BAD TO THE BONE..
