question on jetting

[grnenvy]

Hey guys got a quick question. Does anyone know what the stock main jet size is. Also my brother inlaws Blaster has a pipe and a high flow intake with k/n on it where do you think we should start out for jetting. I also need to know what position on the needle do you guys run on with a pipe and open lid box. Thanks
Yeah we need to get a manual for this bike.

 

[ron89]

the stock main jet is a 230.. i would say start around a 260 and u can run without the lid but u need to run a bigger jet .. hope i helped ..

 

[hickskateboarder]

depends on kind of pipe and whatnot, but i would think slightly bigger than 260 with the airbox lid removed. i'd say try a 280 or 300. the only way to know is try one, ride it for 20 min or so, get it nice and hot, then check the plug color. there is a diy on reading plugs. its better to be rich than lean, start big then go smaller.

 

[grnenvy]

yo

Thanks

depends on kind of pipe and whatnot, but i would think slightly bigger than 260 with the airbox lid removed. i'd say try a 280 or 300. the only way to know is try one, ride it for 20 min or so, get it nice and hot, then check the plug color. there is a diy on reading plugs. its better to be rich than lean, start big then go smaller.

 

[Chevy1500z71]

always remember, if it looks like its jetted good, and you think your done, make it a little richer. you should always make sure you never run a 2 stroke lean...

there is far more to it than you are getting from this thread and the only way you will learn is by doin it, its just a shame that the blasters carb is such a pain to move around with that stupid throttle thing on top.

you will need to adjust the air fuel screw also, it needs to be around 1-3 turns out, if its way out, then your pilot jet is rich, if its way in then your pilot jet is lean. the needle is only adjusting how much of the main jet you are using and how it ramps up to the main jet, once you hit wide open throttle, the needle means nothing, you are now running on the main jet only. if the midrange power feels rich then move the needle down, if it feels lean, then move the needle up. you will develop a feel for it.

the needle has everything to do with throttle response but how you set it has to do with the idle, and if its withing spec of the pilot jet. if you get the air fuel screw correct with your idle and pilot jet you will have good response and that will be taken care of.

 

[grnenvy]

yo

Thansk for the info.
Well after focking with it for 2 days it's running awesome throttle response is crazy and the bike is plain out fast. I'll tell ya I had the carb out about ten time. I know that little carb in and out. Ok whats next lol

always remember, if it looks like its jetted good, and you think your done, make it a little richer. you should always make sure you never run a 2 stroke lean...

there is far more to it than you are getting from this thread and the only way you will learn is by doin it, its just a shame that the blasters carb is such a pain to move around with that stupid throttle thing on top.

you will need to adjust the air fuel screw also, it needs to be around 1-3 turns out, if its way out, then your pilot jet is rich, if its way in then your pilot jet is lean. the needle is only adjusting how much of the main jet you are using and how it ramps up to the main jet, once you hit wide open throttle, the needle means nothing, you are now running on the main jet only. if the midrange power feels rich then move the needle down, if it feels lean, then move the needle up. you will develop a feel for it.

the needle has everything to do with throttle response but how you set it has to do with the idle, and if its withing spec of the pilot jet. if you get the air fuel screw correct with your idle and pilot jet you will have good response and that will be taken care of.

 

[quam]

hey chevy, maybe i read your post wrong, but isn't it backwards on the pilot screw?
i always heard if the pilot screw is on the intake side of the carb it controls the air circuit (turn out = more air, turn in = less air) and if it's on the engine side of the carb it controls the fuel in the pilot circuit (turn out = more fuel, turn in = less fuel).

also, grnenvy, a good way to tell if your needle is in the right position is to take the wheeler down the road in 2nd gear and hold the throttle at about 1/3 throttle, then pull in the clutch and hit the killswitch at the same time while keeping the throttle at 1/3. pull over to the side of the road and check the plug. then do it again at about 3/4 throttle.
this will give you a general idea of how your needle position is set up.

 

[hickskateboarder]

hey chevy, maybe i read your post wrong, but isn't it backwards on the pilot screw?
i always heard if the pilot screw is on the intake side of the carb it controls the air circuit (turn out = more air, turn in = less air) and if it's on the engine side of the carb it controls the fuel in the pilot circuit (turn out = more fuel, turn in = less fuel).

thats exactly what i was thinkin quam..