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View Full Version : Does my jetting sound about right?


07ERider
08-21-2007, 07:14 PM
Hey guys I am getting ready to make a trip to get my quad dyno'd soon and would like to get my jetting about as close as possible so I hopefully dont have to change anything on the dyno.

Mods are:
Rossier Exhaust
HRC cam
Airbox lid removed

Carb changes are:
162 main
48 pilot
HRC needle clip 3rd groove from top
55 leak jet
Fuel screw 1 7/8 out
Accelerator pump screw 1 1/8 in from stock

Does this sound about right?
07ERider
08-22-2007, 12:28 AM
Anybody?
quadracer505
08-22-2007, 04:14 PM
you sound lean still. I have a 160 main with just the lid off and a k and n. I can't be sure though, you might be fine. Mine is an 04 too I don't know what year yours is it might be different.
mrnate400ex
08-22-2007, 07:57 PM
With a Dasa pipe, Web 943/921, and k&n filter I had a 162 main in mine and it was way lean on the dyno. I put a 175 in but didn't run it again. I figure if nothing else, run it a little rich!!
4ABURN
08-23-2007, 07:12 AM
I am the same only with FMF pipe and the only think differant in jetting is I run a 45 pilot, I think your at a good starting point:D .
sandmanblue
08-24-2007, 02:50 PM
Originally posted by 07ERider
Hey guys I am getting ready to make a trip to get my quad dyno'd soon and would like to get my jetting about as close as possible so I hopefully dont have to change anything on the dyno.

Mods are:
Rossier Exhaust
HRC cam
Airbox lid removed

Carb changes are:
162 main
48 pilot
HRC needle clip 3rd groove from top
55 leak jet
Fuel screw 1 7/8 out
Accelerator pump screw 1 1/8 in from stock

Does this sound about right?


Prediction after your dyno test - you will end up with a 170 - 172 main and the rest will be fine.

The 162 HRC jet was designed for the full HRC pipe/silencer combo - NOT aftermarket full pipes. Wouldn't Joe at Rossier tell you what jetting he recommends? He built nearly this same combo (ran a HC2 instead of the HRC cam)....
07ERider
08-24-2007, 08:00 PM
Ya I talked to Joe at Rossier and he recommended exactly what the bike has now.

I personally thought from all the reading and dyno graphs I have seen on certain combos I would be needing about a 172 main jet also but Joe has a lot more experience and knowledge than me so I am going with his recommendation to start with and go from there.