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Post by leslieas1 on Sept 19, 2020 16:54:04 GMT -5
we upgraded our2020 tao tao 49 cc to a 90 cc bbk. It ran rough, wouldnt idle down, electric start acted like it wasnt strong enough or batt dead. Used kick start till it broke twice. Eventually it got to where it woyld turn over once and lock up..then turn over once and lock up. Even using kick start. We have upgraded the starter, wires from battery, clutch, carb..battery.. nothing fixing it. Any ideas?
When we get it started (starting fluid helps) it runs and drives fine.. it just locks up turning over..any ideas?
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Petro
Scoot Enthusiast
Posts: 149
Location: Gothenburg, Sweden.
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Post by Petro on Sept 20, 2020 9:38:50 GMT -5
I do not understand "locking up" but a new kit is tough to the starter before it's ran in. On my cheap first scooter the starter was not able to run anything over 72cc... Even when ran in You might have electric starter issues with 90cc...
To make it start easier in the beginning a lower compression might be needed, double bottom or head gaskets is the easy way to go.
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Post by GrumpyUnk on Sept 21, 2020 10:54:00 GMT -5
I have done a half dozen or so 72cc changes and all had no problem cranking. If you cannot kick the engine over using the manual kick start, something is likely wrong internally. It could be a cam timing issue, a chain guide or tensioner problem, or even something in the CVT.
You should be able to use the kick starter by hand to rotate the crankshaft. Not quickly, but just pushing with a hand, slowly.
If it seems that it is getting harder and harder to crank as you add more run time, it is possible that the rings are seating better increasing compression, or the other side of the coin, that the piston is not sliding smoothly, and may be running hot, and is slowly grinding itself up or getting ready to seize.
You did put the ducting back when re-assembled, as it will certainly cook to a cinder without it. Bought one like that. BBK, and it wouldn't even start. Piston and cylinder both ruined.
tom
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