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Sparkles
05-08-2002, 01:44 PM
what jet should i put in my bike, i just bought a pro circuit t-4
05-08-2002, 01:53 PM
I'd go up 1 or 2 sizes,,start with the 2nd larger first and go down.
05-08-2002, 04:11 PM
probably a 152,155 or 158. only you will be able to tell how your bike reacts with different jets.
05-08-2002, 07:47 PM
hey sparkles u goin to the pit saturday?
DEAL
05-08-2002, 08:10 PM
170 man , i already told you , thats what the dyno jet kit says.
05-08-2002, 08:11 PM
don't trust the kit ...
DEAL
05-08-2002, 08:20 PM
I'm just goin by what it says , I did his jetting when he first put the filter in and it worked pretty good.
MichaelS693
05-08-2002, 08:27 PM
guys help me out all i have a is a sparks x-4 and a filter what do i need to put in its to rich with a 128 im fixin to put a 132 in tomorrow what do yall th8ink
DEAL
05-08-2002, 08:29 PM
Make sure your needle position is right.
Wheelie
05-08-2002, 08:57 PM
Don't put the 170 main jet in....it will run way too rich.

If you are running with the airbox lid still in place/unmodified, use a 150 main jet.

If you decide to remove the airbox lid or modify it, step up to a #40 pilot and a #155 main jet.
generalg
05-08-2002, 09:22 PM
Like everyone else has said. Don't use the 170mj. That is the jet my 400 had in it when I bought it. It would crap out 3/4 to full throttle. Called Dynojet and they said that the 170 was to rich even with the airbox lid off. They said to warm the bike up and than take the air filter off, run it. If it runs better than drop down a notch on the main jet. I ended up going to a 155 with the airbox lid off. I can still run with the lid on, especially on the hotter days so it will not run to lean.
05-08-2002, 09:33 PM
When I bought my Big Gun they sent me the jetting specs. Call Pro Circuit and see what they say. Also find out if they recomend a K&N or removing the airbox lid. BG recomended both.
Sparkles
05-09-2002, 03:24 PM
im gonna use a 170
RED121572
05-10-2002, 07:07 PM
A buddy of mine is running a T-4 with a K&N. He claims a 155 main works well.
DEAL
05-10-2002, 07:23 PM
It depends on your elevation.
Wheelie
05-10-2002, 07:41 PM
A 170 main jet will be too rich no matter what the elevation happens to be.
quadfamily
05-10-2002, 08:20 PM
correct me if I'm wrong but aren't Dyno Jet jets sized differeently than stock jets? What I'm getting at is that a 170 Keihin jet may very well be too rich but a 170 Dyno Jet may be just right? Am I way off base here??
DEAL
05-11-2002, 07:42 AM
Yeah i heard that too.
Red Rooster
05-11-2002, 08:11 AM
Originally posted by quadfamily
correct me if I'm wrong but aren't Dyno Jet jets sized differeently than stock jets? What I'm getting at is that a 170 Keihin jet may very well be too rich but a 170 Dyno Jet may be just right? Am I way off base here??


Yeah, quadfamily, you are correct. I heard the same thing...... I don't think they are even close!
05-12-2002, 10:24 AM
dyno jets are bigger then keihin jets. It's just the way they mesure them.