new to carb jetting

[banshee1998]

hello everyone. i am new to the group. i just bought a 98 banshee this last weekend. my problem is that i think it needs jetted. heres whats going on. starts up just fine cold or warm and idles good. go to take off and seems to have a bogging spot in the throttle just off idle if you slowly press into the throttle until you hit about 1/4 to 1/2 throttle, then takes off like a raped ape. now during acceleration it smokes pretty bad through all gears but doesnt bogg at all and when brought down to a idle was still smoking pretty bad. kill switch it and there was smoke comming out my exhaust lightly with the engine off. here are the mods that the guy told me when i bought it. it was bored .020 over, FMF fatty pipes, K&N air filter cone type with air box and lid still, and he said it was ported but i he didnt say how much. i havent torn into the carbs to see what jets are in it. and i live in washington state at evevation of around 500 feet. any help would be great!!

[bansheeboy02]

hello everyone. i am new to the group. i just bought a 98 banshee this last weekend. my problem is that i think it needs jetted. heres whats going on. starts up just fine cold or warm and idles good. go to take off and seems to have a bogging spot in the throttle just off idle if you slowly press into the throttle until you hit about 1/4 to 1/2 throttle, then takes off like a raped ape. now during acceleration it smokes pretty bad through all gears but doesnt bogg at all and when brought down to a idle was still smoking pretty bad. kill switch it and there was smoke comming out my exhaust lightly with the engine off. here are the mods that the guy told me when i bought it. it was bored .020 over, FMF fatty pipes, K&N air filter cone type with air box and lid still, and he said it was ported but i he didnt say how much. i havent torn into the carbs to see what jets are in it. and i live in washington state at evevation of around 500 feet. any help would be great!!

 

I would try cleaning the hell out of the carbs first. Take every jet out and clean the whole thing.

[fastrthnu]

try turning your air screws out a half turn each. If that fixes it a little but not enough,. turn it 1/4 turns until its good.

[banshee1998]

try turning your air screws out a half turn each. If that fixes it a little but not enough,. turn it 1/4 turns until its good.

 

 

ok, here is a update on the carbs. i took them a part and checked the jetting. idle jet was a 32.5 and the main was a 260. i thought the idle jet was a little to rich so i swaped it out for a 25 put them back togeather and checked the running. now the bike wont idle and backfires pretty bad. try ajusting the idle screws and no change. try messing with the air screws and seems to run a little better turned out 1/2 turn from the bottom but still backfires. so what did i do wrong?? am i way to lean now?? i have the tro switches on the carbs still and i am thiking about converting the to take them off. any other ideas?? shoud i go with a fatter idle jet??? thanks

[okbeast]

If it runs better at 1/2 a turn out I believe that means you need a bigger pilot. Try a 27.5 at 1-2 turns out and see how that does.

[banshee1998]

well, here is another update. i took the carbs compleatly off. elimanted the tro switches and converted it to 1/4 twist throttle, put 27.5 pilot jets and 280 mains with the needle clip on the 2nd one down from the top. put it all back togeather and now idles and runs pretty good. have the mix screw out about 1 turn. now all i have to do is run a plug check and see where i am at. this dang washington weather is rainy so havent got to do a good ride and the plug check, so i am waiting for the nicer weather to run it and check.