jetted correctly

[tnc110]

2005 ltz 400 with innards removed from muffler and lid off. Elevation 3500'. I first tried a 142.5 jet and it ran fine. plug was clean, but a little white. Now has a 145 main and still runs good, plug still a little white. 25 pilot. If it ran fine with the 142.5 and i bumped it up to a 145 am I safe as far as not being too lean? also, do i need to do anything with the needle?

[Duf6]

you could probley go a little higher on your main you want your plug to be a light brownish color and if its still running ok you might not need to do anthing to your needle

[tnc110]

what main should i use...ive heard anywhere from 145 to 160???

[Duf6]

try a 148 to 150 and see how that does

[tnc110]

and the fuel adjustment screw...should it be adjusted any? does it control the 1/4 to 3/4 throttle only?

[Duf6]

yeah you may need to make a small adjustment to your air/fuel screw but you need to remember where its at now so you can put it back if you need to and only make small adjustments at a time, and yes 1/4 to 3/4 only

[86250rrider]

i have a way of doing it while running. works perfect every time. hard to explain typing though. gotta wear gloves though.its gets hot !lol