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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
I am at the end of my needle!
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[QUOTE="jmics19067, post: 621664, member: 27963"] Bruce there are plenty different sizes available. watch out though an 88 rm250 tms is different than a 94 yamaha yz tms carb. both are the "d" shaped throttle slides without a replaceable nozzle. the suzuki has a different top<where the cable mounts> a different needle<shorter length then yz> and a different pilot style<short jet that sets in a well like the old round slide mikuni compared to yz no well long style pilot jet> You should be able to get the short pilot jet down to a 15 and the long style down to a 10<1999 white bros catalog has them listed that way> the stock yz jet needle is 6ej33-61 where acoording to my manual says that the e is the angle of the first taper the j the angle of the 2nd taper and the 61 atthe end is the root diameter of the straigh portion,<higher number is thicker .....leaner> the rm needle is a 6 ej12-55 now I suspect that the 12 is the actual lenght of the needle since it is shorter than the yz according to my catalog here a flatside 35mm carb takes a say a 6 en 11- XX while a 38 would take say a 6 ej 12-xx but I would have no clue where the yamaha numbers fit in Your different pilot jets you have is it possible that the band you are talking about is only a difference between geniune Mikuni and somebody else making it? I am not sure how this would affect you being a newer carb with different requirements but I hope it can help decipher some of the coding. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
I am at the end of my needle!
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