1 Trick Viper
New member
Any benefit from jetting down slightly from the stock jetting? What are the stock jet sizes anyway? I think it runs rich right now but I don't want to be on the ragged edge as I want it to be reliable more than anything. I ride by myself quite a bit so I don't want any surprises. How about the rest of the carb settings? Also, anybody hear about or have luck with drilling three holes on the top of the airbox to let the motor breathe a little bit better? I think I heard about drilling 1.5" holes next to the three slots on the top? Thanks for any advice.
Squeeze Play
New member
Hey Trick Viper I am practically your neighbor. I live in Otsego. I have a 2004 Viper S and the stock jet for mine was 156.3. I believe that I dropped down one size to 155s. I also did the airbox mod, but I used adjustable air horns that can be closed if necessary and that fattens the jetting back up +3 sizes. Couple of things to note, my carbs vent to the airbox and I also have DCS. So I am protected a bit with the DCS system. I believe holzman engineering had the air horns called Flow Rites. Hope it helps.
1 Trick Viper
New member
Thanks for the info Squeeze. I will have to look further into the jetting issue. How are the carbs vented into the airbox and what if mine were not? Is that easy to modify and what does that change? I checked out the Holtzman Engineering website and did not see the Flow Rites that you mentioned but I will keep looking.
mod-it
Member
As far a jetting, you'll have to read the color on your plugs or the top of the pistons to see if you can jet down. I don't think anyone will say "yeah, you can" when they don't know what your plugs look like. What elevation do you ride, and what "average" temperature? These are the main factors. 156.3 is the factory main jets.
If you do an air mod, it will lean you out some also. You will have to keep a close eye on your plugs. The Flow-rites in my dash are from SLP (Starting Line Products). An adjustable air vent would be sweet, because you could change your jetting slightly simply by opening/closing them.
I have SLP triple pipes and flow-rites. SLP was able to provide me with a base line jetting chart. Of all things, the stock jets are what I am running. I did the pipes first, and was running pretty rich. I thought I was going to have to jet down. I decided to add the flow-rites first, and it leaned it out quite a bit more than I expected. Temperature makes quite a bit of difference, it is usually around 20*F here. Last year on one of my rides it was about 0*F, and my plugs were as light brown as I would ever want to see them. What I'm trying to say is I like to jet a hair rich so that I don't have to freak out when it is a little colder than normal.
Jetting can be a PIA to get right, you have to be patient and plan on sacrificing some riding time.
If you do an air mod, it will lean you out some also. You will have to keep a close eye on your plugs. The Flow-rites in my dash are from SLP (Starting Line Products). An adjustable air vent would be sweet, because you could change your jetting slightly simply by opening/closing them.
I have SLP triple pipes and flow-rites. SLP was able to provide me with a base line jetting chart. Of all things, the stock jets are what I am running. I did the pipes first, and was running pretty rich. I thought I was going to have to jet down. I decided to add the flow-rites first, and it leaned it out quite a bit more than I expected. Temperature makes quite a bit of difference, it is usually around 20*F here. Last year on one of my rides it was about 0*F, and my plugs were as light brown as I would ever want to see them. What I'm trying to say is I like to jet a hair rich so that I don't have to freak out when it is a little colder than normal.
Jetting can be a PIA to get right, you have to be patient and plan on sacrificing some riding time.
nodoo_s
New member
i have been running i believe in the 152.X for the last 4 years and one layer removed with no problems.
Squeeze Play
New member
Hey Trick, here is the link to the company I bought the air valves from for my airbox:
http://www.thunderproducts.com/tpi_valve.htm I got the Knobby's which are adjustable. SnowTech put 4 of them on the airbox they modded, but I only used 3 which I felt was a bit safer. Sorry my memory was bad, good thing they had TPI stamped on top and that triggered my memory.
http://www.thunderproducts.com/tpi_valve.htm I got the Knobby's which are adjustable. SnowTech put 4 of them on the airbox they modded, but I only used 3 which I felt was a bit safer. Sorry my memory was bad, good thing they had TPI stamped on top and that triggered my memory.
Last edited:
nodoo_s said:
sounds like youve been to woodys in topsham
banditcj7
New member
2004 Viper s
just added slp triple pipes to my viper, running the 165 main jet, 47.5 pilot, needle at #4 position, air screw 1 3/4 out, take it out for a run and the plugs are white still? im in Northern Indiana so elevation is not to high. Any help would be helpful, Thanks
just added slp triple pipes to my viper, running the 165 main jet, 47.5 pilot, needle at #4 position, air screw 1 3/4 out, take it out for a run and the plugs are white still? im in Northern Indiana so elevation is not to high. Any help would be helpful, Thanks
If we ever get some snow I might have to hook up with you guys! I just moved to Rogers from Brooklyn Park. (Old Hassan township) Dyin for some snow now that I can ride out my back yard.
staggs65
Moderator
this is a 5 year old thread. those mn guys havent been on here for about as long0srx0 said: