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yfz450 jet # when u remove lid and baffle

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Old Jul 21, 2003 | 09:18 AM
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Default yfz450 jet # when u remove lid and baffle

someone know jet size and clip position when u remove lid and baffle

thanks all
 
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Old Jul 21, 2003 | 09:22 AM
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Default yfz450 jet # when u remove lid and baffle

ouppss

may be it will help presently i have #158 in it (stock)
 
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Old Jul 21, 2003 | 09:37 AM
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Default yfz450 jet # when u remove lid and baffle

We certainly do. what is your altitude?

Take out the needle jet and move it from clip #4 (stock) to clip #6 --down towards the pointy end more by two clips.

file off 1/8 inch of the big fat end of the needle so you can get it mback in the screw holder .
if you are at sea level jet to 165
if you are 1000-2000 feet jet to 162
and if you are at 5000 feet jet to 160

this make the motor run sweet and really puts out about 5 more HP
very simple.
 
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Old Jul 21, 2003 | 10:12 AM
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Default yfz450 jet # when u remove lid and baffle

thanks daddogrider

my altitude is around 700 ft above sea level
 
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Old Jul 23, 2003 | 01:00 PM
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Default yfz450 jet # when u remove lid and baffle

(Question)

If you don't file off the head of the needle it will not fit back after moving the clip ring?

Can you get a difftent needle for the 450?

Also the jet sizes are they Mikuni or Dynojet
looking at the mikuni/dyno chart

Mikuni 160 = 170.7 Dyno
162.5 =173.3
165 = 176
-------------------------------------------------
Dyno 160 = 150 Mikuni
162.7 = 152.5
165 = N/A
165.3 = 155
I don't meant to be rude or anything I just would like to get it right the first time.

Thanks
 
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Old Jul 25, 2003 | 12:36 AM
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Default yfz450 jet # when u remove lid and baffle

Took the baffle out and removed a/b lid today. Did the 165 main and #6 position on the needle. Man, it runs sweet and the added power is huge. Has anyone else thats runnings these settings adjusted the mixture screw, if so how many turns out, I left mine where is was stock, seems to be right on though. thanks
 
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Old Jul 25, 2003 | 08:27 AM
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Default yfz450 jet # when u remove lid and baffle

Originally posted by: erich
Took the baffle out and removed a/b lid today. Did the 165 main and #6 position on the needle. Man, it runs sweet and the added power is huge. Has anyone else thats runnings these settings adjusted the mixture screw, if so how many turns out, I left mine where is was stock, seems to be right on though. thanks

i have done this set up with the recomendation of " daddogrider"
and yeah its rock !! and i put a 15 tooth sprocket and it better now
and yesterday i talked to the son of my dealer who is working there too he put is own 450 on dyno to fine tune it and he said it need to be jetted with a #172 no lid and no baffle needle clip stock and is dyno number are 44hp and 29lbs of torque (i know dyno# can vary)
mine is with a #165 and it not the same bike as a stock one ;-))

im at 700ft above sea level
 
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