jet size for a blaster
Jan 27, 2000 | 11:35 AM
#1
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Trailblazer
Joined: Sep 1999
Posts: 51
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the stock jet size for a blaster is 230 what size should i put in my carb for an aftermarket pipe and reeds and a .20 over bore with wiseco piston and rings. help me please
[This message has been edited by 98'blaster (edited 01-27-2000).]
[This message has been edited by 98'blaster (edited 01-27-2000).]
Jan 30, 2000 | 01:55 PM
#3
Weekend Warrior
Joined: Jan 2000
Posts: 14
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Jetting is a both an art and a science. You have to get a feel for it through trial and error.
You're talking about the main jet. This will only effect from 3/4 to full throttle. The air screw, pilot jet, needle, and slide effect from idle to 3/4 throttle. Modifications to each of these components needs to be made to fully tune a carb.
The process to tune each of these components is lengthy. You should do a web search on carburetor tuning to pull up several methods.
For the main jet, if the ATV blubbers and excessive smoke comes out of the exhaust at full throttle than it's too rich. If you get hesitation and erratic engine response at full throttle then the jetting is too lean.
Any mods such as a pipe, silencer or even a different brand of gas could require carb jetting mods. The weather also effects each component. The colder and dryer it is outside, the leaner your ATV will run. You thus need to richen the jetting. The warmer or more humid it is outside, the richer the bike will run. You must lean the jetting in this case.
The type of terrain you ride on also dictates jetting mods. Riding on long straight aways, up hills, or in sand or mud requires richer jetting.
I rejet my Motocross bike several times throughout a race day. It's cool in the mornings and warmer in the mid afternoons. If you want to maximize performance this needs to be done.
If you have to error on either the lean side or rich side, go rich. You might foul a plug or two if the jetting is rich, you'll sieze the engine if the jetting is too lean.
Have fun tuning your ATV.
Dave
You're talking about the main jet. This will only effect from 3/4 to full throttle. The air screw, pilot jet, needle, and slide effect from idle to 3/4 throttle. Modifications to each of these components needs to be made to fully tune a carb.
The process to tune each of these components is lengthy. You should do a web search on carburetor tuning to pull up several methods.
For the main jet, if the ATV blubbers and excessive smoke comes out of the exhaust at full throttle than it's too rich. If you get hesitation and erratic engine response at full throttle then the jetting is too lean.
Any mods such as a pipe, silencer or even a different brand of gas could require carb jetting mods. The weather also effects each component. The colder and dryer it is outside, the leaner your ATV will run. You thus need to richen the jetting. The warmer or more humid it is outside, the richer the bike will run. You must lean the jetting in this case.
The type of terrain you ride on also dictates jetting mods. Riding on long straight aways, up hills, or in sand or mud requires richer jetting.
I rejet my Motocross bike several times throughout a race day. It's cool in the mornings and warmer in the mid afternoons. If you want to maximize performance this needs to be done.
If you have to error on either the lean side or rich side, go rich. You might foul a plug or two if the jetting is rich, you'll sieze the engine if the jetting is too lean.
Have fun tuning your ATV.
Dave
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