Stock jet size? - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums
 
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post #1 of 9 (permalink) Old 02-24-2013, 11:07 AM Thread Starter
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Stock jet size?

This yfz I acquired has a big bore kit aftermarket white brothers exhaust some kind of foam filter with no airbox lid.. When I took the carb apart to clean it I noticed the main jet was a 150,didn't look at pilot.. What size is the factory jets??
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post #2 of 9 (permalink) Old 02-24-2013, 12:35 PM
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42p 158m
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post #3 of 9 (permalink) Old 02-24-2013, 01:10 PM Thread Starter
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Huh, you telling me the previous owner went down on jet size after all the mods he did!!! Explains why I'm having all these problems!!
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post #4 of 9 (permalink) Old 02-24-2013, 02:28 PM
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It's prolly a dynojet...different sizing than keihen
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post #5 of 9 (permalink) Old 02-24-2013, 02:36 PM
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Not sure on the 450s but in 2 strokes when you go big bore you are sucking more air which vacumes in more fuel so you jet leaner. Not sure if this is the case though. Like posted above it could be a different jet kit that uses different numbers, Is the main a hex head jet or round with a screw driver slot?

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post #6 of 9 (permalink) Old 02-24-2013, 02:51 PM
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X2 on the dynojet. Definatley junk those out and switch to the correct keihin hey size. I think a. 150 dynojet is a 165 or 168 keihin jet. There's a conversion chart on here some where... ill get a link for you.
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post #7 of 9 (permalink) Old 02-24-2013, 02:54 PM
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post #8 of 9 (permalink) Old 02-24-2013, 09:07 PM Thread Starter
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Thanks guys
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post #9 of 9 (permalink) Old 02-24-2013, 09:52 PM Thread Starter
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It says that dyno jets are round and needs an adapter, I have the kiehin jet then... A damn 150!!
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