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Old 04-18-2009, 03:09 PM
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Dirt Bike Jetting

Ok so heres the deal, my sister rides an '04 Yamaha TTR-125L. We went out riding today and I couldn't get her bike to start for the longest time. Finally, I took the carb off and cleaned it the best I could out at the riding spot. I found the float to be sticking and a bunch of sediment in the bowl. Both jets didn't seem clogged as I could blow through them fairly well.

After cleaning the carb, it fired right up but ran like crap. The second you put a load on the engine (like going up a hill) it would bog down and just die.

We brought the bike up from Denver and its in Casper now; around the same elevation, but all the Colorado riding we did was up in the 9,000 foot plus range. The bike still ran well in Denver, but it did sit on a trailer for about 3 years with no maintence.

I'm thinking either the carb is still dirty (clogged jet), or the carb needs rejetted.

What do you guys think?
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Old 04-19-2009, 05:28 AM
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So is there an elevation change or not? You said Denver and Casper are same elevation, but in Colorado you rode at 9000 ft??? If im not mistaken i think its every 2000 ft of elevation change requires a jetting change.

Pulling the carb off and cleaning it one good time is not a bad idea.

Best bet is to do a plug check. Run it wide open and then just kill it, dont let it rev down. pull the plug and check it. That'll tell ya where the jetting is at.
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Old 04-19-2009, 05:33 AM
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May sound silly but have you checked your air filter? cleaned and re oiled?
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Old 04-19-2009, 05:55 AM
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I would take the carb off and take it to a shop. Have them steam clean it and rebuild it. To me it sounds like the carb is in need of a rebuild. Also if you tell the shop the specs of the bike. Like after market exhaust, sprocket teeth, what type of air filter your running. When the shop rebuilds the carb, they can jet it for the elevation and modifications you have done to the bike.
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Old 04-20-2009, 05:37 PM
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Well, I dove a little deeper into the carb after I washed all of the mud off. It turns out the float was still sticking. Apparently the gas was never drained outta the carb when it was put on the trailer 3 years ago and all the old fuel gummed up.

I took the float apart and cleaned everything really well with carb clean, blew out the jets with compressed air, and reassembled everything.

Bike started right up, would idle (after playing with the idle screw a bit), and ran a whole lot better.
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