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Hi all, my 1st post here thanks in advance for the advise. I just upgraded from a 50cc Chinese scooter to a 300 cc (278 in reality). From my research it is the same as a Jonway 250, just with a 278 cc engine. Body and everything else is identical. Having had my 50 I have gone through it quite well and have it running great. I've had it for 4 years, put 4000 miles on it. I replaced air lines, re-did the crappy electrical connections, had my buddy tune it up, replaced the Chinese fuel lines.

The 300cc I just picked up is a 2012 with 750 miles on it. So far I love it, but alas, new problems. I know I should do a coolant, oil and gear lube change. Since I got it Friday I have put 120 miles on it. It ran a little rough from day one, stalled out on me with an idle set at 1000 rpm. The idle didn't scare me much as the tag says it should be at 1500. If i kept it at 1500 it would not stall so I was going to adjust the idle this weekend. What worried me more is the fact that it was "missing" quite a bit. Over the last 6 days it became progressively harder and harder to start and this morning it would not start at all!


The previous owner bought it brand new, put the majority of the miles on it in 2012, and only rode it once or twice last year and stored it away with old gas in it. I had to being it home 50 miles, so filled it up with new fuel (without draining the old half tank of fuel). Ran that tank down to half, and again refueled, this time adding seafoam to the tank in hopes to aid in any cleaning that was causing it to miss. 

Any advise for me? Things to look for? My buddy will be helping me I hope, he's  small engine mechanic, but hasn't worked on many scooters. Just wondering if there any "must change parts that I should take care of or common problem areas?


I'm also wondering which engine this unit has, where can I get a manual, and what size "charging unit" is on this bike?