Jeremybeiler
New member
Do the pilot jets have to be turned all the way in?thanks in advance!
Jeremybeiler
New member
Also running 160 main jets with mbrp can, Anyone have this set up, and what are your jet needles set at?
Yes, same as the main jets and air jets. Turn them in till snug.
Or, are you talking about the air screws on the bottom of the carbs?
Or, are you talking about the air screws on the bottom of the carbs?
Jeremybeiler
New member
ok, no I wasn’t talking about the air screws, thank you
What model and year is your sled?
160 mains are way too big, unless you have a big bore or something like that.
A 'can' doesn't usually affect jetting.
The stock jets for your Viper were 156.3 so as stated 160 is too big for a stock exhaust Viper even with a can.
For part throttle cruising safety, most people advised to change the needle position from the stock 3 to 3 1/2.
Position 3 would have the needle clip in the 3rd groove from the top and both plastic washers together below the clip.
Position 3 1/2 would have the needle clip in the 4th groove from the top and the plastic washers split between one washer on top of the clip and one below the clip.
These jetting specs are with the carb vent tubes connected to the airbox which is stock on a Viper.
For part throttle cruising safety, most people advised to change the needle position from the stock 3 to 3 1/2.
Position 3 would have the needle clip in the 3rd groove from the top and both plastic washers together below the clip.
Position 3 1/2 would have the needle clip in the 4th groove from the top and the plastic washers split between one washer on top of the clip and one below the clip.
These jetting specs are with the carb vent tubes connected to the airbox which is stock on a Viper.
Yep, I would run the stock main jets, move the clip on the needles to be at 3 1/2, and turn the fuel screws to 1 7/8 turns out.
(They are fuel screws, not air screws like I had said before)
(They are fuel screws, not air screws like I had said before)
Jeremybeiler
New member
It’s an 02 viper, talked to a Yamaha guy at a shop said I need 160 jets for an mbrp can
Jeremybeiler
New member
Have you ever seen a viper with the vent lines connected to the air box plus a vent or suction hose connected to the top of the carb? On the the black part of the carb, I looked everywhere and couldn’t find one that did which I thought was weird, and yes it a separate line directly into the air box
There is zero chance it needs a jet change for a silencer.
I think most here would agree.
I think the extra hose you are talking about is a temp or altitude compensator system.
I have no experience with them at all, but sounds like that is what you may have there.
I think most here would agree.
I think the extra hose you are talking about is a temp or altitude compensator system.
I have no experience with them at all, but sounds like that is what you may have there.
Jeremybeiler
New member
Thank you for the information! I will put it to use, ain’t nothing better than a smooth running viper
On a stock 700 Viper all the bowl lines connect into one T fitting that hooks to the airbox.
Jeremybeiler
New member
My viper has a t fitting that’s connected to the air box, it also has a separate line running into the head of the carb, which I find odd