SUNL 50CC SCOOTER

I lost my key to my sunl scooter Anon. contact a local lock smith, most of them can make a replacement key to work in scooters. Check the attached links or google search for locksmith for replacement motorcycle key, for your area. Good luck
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i have a 250 and there is a spacer in the gear box right under the starter if the spacer isn't sat right it will make gears bind and nothing will work starter wont turn over at all but if you pull the casing off the left side of motor the starter will spin free. reset the spacer or get a new one

with the spark plug out and the valve cover removed; place a screwdriver into the spark plug hole; turn the crankshaft until the valves are all the way up and, not moving as the piston just starts to go down in both directions; (use the screwdriver to see this) this is TDC or, top dead center now; you should see symbols on the faces of the cam gear and, the crank gear and, two places on the chain; line up the chain symbols with the gear symbols chain symbols facing out and, install the chain.
by the way they make a kit for stripped sparkplug holes an auto parts store will have it in case you need one again.

neutral/safety switch might be bad. the safety switch that is controlled by pulling in the brake lever

the gapping is standard you can u a match book and if it slides between the gap easy it is fine if it wont goo in the gap it needs to be gapped more if there is alot of space between it, it needs to be closed up some.

the battery earth to the bikes chasy may be dirty check all battery leads are clean and tight plus any to the frame,,,

no, if it starts on the kicker petrol is not an issue, could be battery though