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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Jetting on TTR125
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[QUOTE="ACS, post: 120299, member: 22784"] The TTR is a cold motor to start. I remember that the choke has to be on for ages with the stock setup. I think its the tiny carb they come with and lean jetting that is stock especially as you open up the airbox and exhaust. I foud that it started easier after it had done a fair bit of work. A bit like the YZF's. Bigger carb cam etc and they are still take a long time to warm up. You adjust the airscrew to whatever suits the particular bike where you are. The YZ250F/YZ426 guys spend ages checking out each others airscrew settings and its a lot of garbage. Jetting specs can vary a bit, sometimes a lot from bike to bike and if you want to be really fast you should jet on the day for temp, altitude etc etc. The air screw should be adjusted to get the bike idleing as smooth as possible by adjusting the idle on the slide stop then adjust the airscrew then the idle stop then the airscrew an keep on going and get the best and smoothest idle then richen a tiny bit and it should now idle perfectly and rev cleanly. Its a fiddle thing not a 1.75 turns out thing.:) I have tried different grades of plugs to see if I could jet differently but the stock seems best but for a stock bike just plugging around a try of a hotter plug could be worth trying for the few $$$ they cost. Be careful though if you then go out and thrash it as the plug could melt things.:eek: [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Jetting on TTR125
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