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Discussion Starter · #1 ·
:bawling: i rode my yfz today and im not 100% sure if my trail tech vapor is set right but it would only go 63 mph and it is piped and has k&n with outerware
stock gearing
stock tires
and was wondering what could be wrong

my jetting is
165 main
50 pilot
2 1/2 fuel screw
r&d ajustable leak jet
 

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I'm no expert but that sounds right to me, I don't think mods will change your top speed just how fast you get up there. If you want higher top speed mess with the gearing.
 

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im pretty sure stock yfzs go like 75 or so, but i have nothing to back that up with. it may be a little rich, but that shouldnt make it that slow. are you sure it has all 5 gears? lol
 

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Discussion Starter · #4 ·
another thing i noticed was it was fine 1-4 gear in last gear it just was like running out of steam and hitting the limiter it was only at about 6000 rpm so i dont think something is right i think it should do 75-80 because it seems stock ones go faster than 63
 

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someone who actually knows stuff is bound to chime in at any moment now =P
 

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Discussion Starter · #6 ·
yes i think it has 5 because i counted i am not the original owner so i am not sure what was done complety got it from the stealership
 

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Discussion Starter · #8 ·
what would you sugest for jetting
first real quad before i had 03 250 trailblazer
when i first got this quad they had a 131 main in it suprised it didnt blow up
 

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thats right, no polaris is a real quad. i dont care if its the outlaw!
 

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How long was it ran at 131 main? Have you looked at the spark plug?

Yfz top speed is approx 73 MPH. Bone stock. There are of course outside variables that make it approx.
 

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Discussion Starter · #13 ·
i am not sure how long it was at that jetting the previous owner raced it
but the only place that jetting might be close is death valley
i myself didnt run it for more than 5 min before i said
this isnt right and said wtf when i saw it
plug didnt look bad but changed it with the rejet
just seems to cut out in 5th gear
runs great in other gears
 

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QUOTE (Joester @ Feb 27 2009, 09:02 PM) index.php?act=findpost&pid=751954
thats right, no polaris is a real quad. i dont care if its the outlaw![/b]
those outlaws FAIL!!!!! my cuzin with his 400 almost beats them!!!
and so the top speed idk if this helps but i was traping @ 75mph on a 1/8 mile drag track with a 15 tooth and i sttill had plenty of gear left when i crossed the line.....
 

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Your clutch may need new plates if it seems to cut out in 5th gear or you may need to adjust the clutch cable or clutch. 168 or maybe even a 165 jet would work, maybe put the needle down a clip to the 3rd groove. You just got to play with it for awhile.
 

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Discussion Starter · #16 ·
ok i think i almost got it
running good it and i was wrong about pilot it was a 48
now its
168 main
48 pilot
it now can pull wheelies using only the throttle in 1-3 it only
cuts out a little now in 5th at about 9000
so i might wait till a little warmer then play with it if it needs it
speedometer now reads 82 with a little more left in it i think.
i might need to play with the tire size on the vapor though,it might be off a little.what should it be set at for in mm for stock tires if anyone knows
 
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