Help with Jetting kit
- Thread starter casper1981
- Start date
You don't really need a "kit". You can go to Rocky Mountain ATV and buy the mains you need. Presuming you don't need a different pilot. Mains are like $2.50 a piece over there.
What carb, reeds, pipe, porting(by whom), compression, etc. are you running? That can usually get a lot of people to help point you in the right direction.
Mild porting on the cylinder, worm ported intake, boyesen pro-series reeds, 1mm base plate spacer (for increased port timing), Head mods (0.047" squish, 18.3cc trapped volume, about 7.2:1 corrected compression ratio) new piston kit 67mm bore. 125psi compression before break in. Im about sea level-100ft.
Just finished all the mods. I ended up getting a Vito's jetting kit, I dont think I should run the smaller pilot that comes in the kit. Anyone else have any input?
Just finished all the mods. I ended up getting a Vito's jetting kit, I dont think I should run the smaller pilot that comes in the kit. Anyone else have any input?
Vitos jets= garbage. I would stick with manufacturers jets, Mikuni if that's what u have or Keihin if that's what ya got. That compression seems a tad low, with the head work you have, I would think that you would be about 130-135. What is Worm ported intake?
That is exactly why it was advised against a kit, you now have atleast one jet you don't need (smaller pilot). What kind of pipe? Stock carb? Start with largest jet and work your way down.
Worm intake AKA: worm holes, boysen ports. Round hole drilled into intakes to transfers. Not recomended for inexperienced builders, you can eff-up (legal disclaimer on my part)
Worm intake AKA: worm holes, boysen ports. Round hole drilled into intakes to transfers. Not recomended for inexperienced builders, you can eff-up (legal disclaimer on my part)
stock carb, I dont know about the pipe it looks like it would be stock, its black? Why are the vitos jets garbage?
check with your yamaha dealer cuz jetting is a key thing and it depends what elevation you ride at and the extra stuff done to your quad
Yeah the ngine work doesnt cost me anything other than time. I work at a Yamaha authorized machine shop. I didnt really want to spend money on this project. Now that its almost done. Im thinking more and more about getting a pipe. It sure would wake the engine up. As for checking with a dealer. They dont know everything. Thats why Im here asking what other blaster enthusiasts what they recomend. Blasters are uncommon up here in Canada. Has anyone tried a Pro-Circuit pipe setup?
we do know all about jetting ported motors, and other mods too, but very rarely do we see someone with all that cylinder/head work using a stock pipe, that completely defeats the purpose of the motor work
i'm clueless, do we tell you 240 jetting for a stock pipe, as thats all it's gonna flow, or do we tell you around a 320 for the cylinder work ??????
or somewhere in between ?????
i suggest not even fooling with it till you get a pipe/silencer and A/M airfilter to match all your hard work, then we will definately get you on the right track with jetting
i'm clueless, do we tell you 240 jetting for a stock pipe, as thats all it's gonna flow, or do we tell you around a 320 for the cylinder work ??????
or somewhere in between ?????
i suggest not even fooling with it till you get a pipe/silencer and A/M airfilter to match all your hard work, then we will definately get you on the right track with jetting
