ozarkdrb Posted October 5, 2007 Share Posted October 5, 2007 Hi, I have nabbed a little old Yamaha Chappy from the late '70's as far as I can muster. It has NO oil tank/pump and instead is running on oil/gas mix. In theory, I can see how this will work OK, but I am unsure of what mix ratio (oil/Gas) should be used. Can anybody give a good guess? Thanks, Ozarkkdrb Fixing up a little bike for the nieces! Link to comment Share on other sites More sharing options...
fosdyke Posted October 5, 2007 Share Posted October 5, 2007 Hi 20:1 is usually a good ratio for standard 2 stroke engines. Do you have a picture of the bike ? Link to comment Share on other sites More sharing options...
ozarkdrb Posted October 5, 2007 Author Share Posted October 5, 2007 Hi 20:1 is usually a good ratio for standard 2 stroke engines. Do you have a picture of the bike ? Not yet! I sure can take a couple this weekend. Poor old Chappy actually feels like it has decent compression and such. I have a new battery, airfilter (the old one was a chunk of nerf ball held in place by a rattlecan paint lid with holes drilled in it, gaskets for petcock that was bad leaky, new fuel line). I love to get old bikes back into respectable shape and have a little fun. The poor baby just needs some TLC and common sense applied. Ozarkdrb Thanks for the info! Link to comment Share on other sites More sharing options...
JasonC81 Posted September 10, 2011 Share Posted September 10, 2011 I have also nabbed 2 Yamaha Chappies. I'm guessing its late 70's maybe early 80's. 50cc motors. I have them running ok and they top out at about 22 mph. I know these bikes don't go very fast to begin with but is there any way to get them closer to 30? If all else fails I might end up taking them to a repair shop and have them tuned up but I would rather save so money and try and do it myself. Anyone have any thoughts or ideas? Link to comment Share on other sites More sharing options...
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