OzVMX Forum
Marque Remarks => Yamaha => Topic started by: jimg1au on May 24, 2008, 02:33:54 pm
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hi
if i was to replace my std exhurst with a chamber would i have to go up in main jet size or leave the carby std.every thing else would be std ie air box
cheers
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just keep checkin the plug colour and get a feel for how the motor is working.
main jets are pretty cheap and DT360s don't rev too high, so if you're real concerned about it running lean or the like. just short shift it for the first ride and do the main jet if it don't "feel" right.
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There's a good chance that a decent exhaust will require a smaller main jet.
In my experience with the DT250, the standard airbox is a power killer, particularly when combined with the standard carby. I fitted a 34mm carby along with a sock filter, and it made a huge improvement on my otherwise standard motor.
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i have a 32 mm and 38 mm carby spare but i have to ride this bike at nepean on the 29th june and i will not get time to play around with jets and carbys.i have the specs for mx250/360 but i am sure the bike would just flood if i run those jets.any one can help with jetting a 38 mm mikuni for a dt360
cheers
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Try a 34mm on a 310-330 main, the clip will fix it it it bogs down, my mx360s run on 310-340 mains each bike likes it differant.
My 250's run on a 270 and 300 mains from memory so you should be good to go in the 300's also it would be under the 340.
so maybe start on 320 on the 38mm and see what happens whats the cut away ? you might be able to put a 1.5 in it or somthing to cut it down a bit of the bottom.