Jetting Chart - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums
 
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post #1 of 8 (permalink) Old 09-25-2009, 11:06 PM Thread Starter
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I've noticed a jetting chart floating around here. Gave jetting specs based on elevation.

I got a trip to St. Anthony's comin up. I currently ride at 900 ft. St. Tony's is 4800 ft. Need to find out how far I will need to drop in jetting. Currently, running a 190 MJ, 45 PJ....

Any takers?

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post #2 of 8 (permalink) Old 09-25-2009, 11:23 PM
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Search harder. :P

http://quadhub.com/extras.php?locati...g%20Calculator

I know what one you mean , and i dont think thats it .. But it might do.

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post #3 of 8 (permalink) Old 09-26-2009, 12:55 PM Thread Starter
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Yeah, I found that "calculator" and, it couldn't be more worthless. I am going up in elevation and, it is telling me too increase my jetting.

Less air, Less fuel.


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post #4 of 8 (permalink) Old 09-26-2009, 02:05 PM
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It probably wasent right but my bike is jetted for sealevel n when I went last year I dident re-jet

04 YFZ. WR crank, MMAD 14.25 piston, CW 98mm, KW ss Valves, KW spring, Velocity head, YZF cams, GYTR Kickstart, Dyna FS, Nology coil, Rossier exhaust, Tusk clutch, FCI intake, Boyesen quickshot R&D fuel screw .
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post #5 of 8 (permalink) Old 09-26-2009, 03:43 PM
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QUOTE (Defiant @ Sep 25 2009, 08:06 PM)
Quote:
I've noticed a jetting chart floating around here. Gave jetting specs based on elevation.

I got a trip to St. Anthony's comin up. I currently ride at 900 ft. St. Tony's is 4800 ft. Need to find out how far I will need to drop in jetting. Currently, running a 190 MJ, 45 PJ....

Any takers?[/b]
Just curious, seems a little weird that u only have a 45 pilot with such a large mj... I'm running a 60 pilot an 178 main, 3rd clip, and I still pop a little on decel?... You would think that if u were needing to run such a large mj then u be running like. 65 pilot? But if it runs good it runs good I gues haha

04 YFZ. WR crank, MMAD 14.25 piston, CW 98mm, KW ss Valves, KW spring, Velocity head, YZF cams, GYTR Kickstart, Dyna FS, Nology coil, Rossier exhaust, Tusk clutch, FCI intake, Boyesen quickshot R&D fuel screw .
Elka triple rate front & back, Houser +2 arms, +1 swinger & +2 stem, G-force axle, Streamline lines, wave rotors, AC nerfs, IMS pegs, douglas beadlocks, MXR6 tires, Pro taper bars, ASV levers, Gibson stablizer, MP twist.
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post #6 of 8 (permalink) Old 09-26-2009, 07:55 PM Thread Starter
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QUOTE (lbyfz450 @ Sep 26 2009, 02:43 PM)
Quote:
Just curious, seems a little weird that u only have a 45 pilot with such a large mj... I'm running a 60 pilot an 178 main, 3rd clip, and I still pop a little on decel?... You would think that if u were needing to run such a large mj then u be running like. 65 pilot? But if it runs good it runs good I gues haha[/b]
I actually don't remember exactly what my jetting is. I know I have a 190 or 192 MJ and a 45 or 48 PJ.

I've got an idea of where I need to be for jetting in Idaho.

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post #7 of 8 (permalink) Old 09-26-2009, 10:49 PM
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Just wanted to let you know I fixed that calculator. Thanks for pointing that out to me.
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post #8 of 8 (permalink) Old 09-27-2009, 08:51 PM
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QUOTE (lbyfz450 @ Sep 26 2009, 12:43 PM)
Quote:
Just curious, seems a little weird that u only have a 45 pilot with such a large mj... I'm running a 60 pilot an 178 main, 3rd clip, and I still pop a little on decel?... You would think that if u were needing to run such a large mj then u be running like. 65 pilot? But if it runs good it runs good I gues haha[/b]
I only have a 50p with a 172m. you might want to check out your air fuel screw. I had a 48 with a lot of pop, put in a 50, and an R&D flex a/f screw and that fixed all my problems.


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