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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Yamaha 1981 YZ465 hard to start
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[QUOTE="sm7482, post: 1371929, member: 84044"] sounds like the big bore maico 490 ive had problems starting. the fact of the matter is that a big bore twostroke is just hard to start. i'll list the way i go about starting the maico. 1st. turn fuel on pull off plug cap, turn on choke and give it some good kicks to prime the engine. 2nd. replace plug cap, use kickstart to bring piston to top dead center. 3rd. pull in compression release and give it a good hard kick. i'll usually get a few pops, a kick back, then a fire. same exact problem as your big bore. ive adjusted the ignition a bazillion times but i know its not that. carb is cleaner than it was from factory. next time you get it running spray some wd-40 behind the carb, if it picks up in idle you have a carb leak. that could cause it to be hard to start. also i'd try richening it up some. maybe picking up another jet but ultimatley lowering the clip on the needle. remember that with a bike this big, the kicking technique is everything. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Yamaha 1981 YZ465 hard to start
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