[dirtboy62617]

Put in a power up kit...runs ok but backfires at start sometimes and bogs hard when i crack throttle wide open. Opened the air box and removed spark arrestor like i was tod i should, now i'm lost. I did order a dg slip on and k&n filter (not installed) will this cure my problem ?

[crfsonly]

welcome to CRF's Only! not sure what kit you have installed but the symptoms you are describing indicate a lean condition in the pilot circuit (at a minimum). the exhaust and air filter will only make this condition worse. what needle, needle position and jets are installed?

again, welcome.

ken

[dirtboy62617]

I put in a honda factory upgrade kit .....it came with a 45 pilot jet, a 132 main jet, a thicker needle wich i set at halfway or dead center, and a new seat.....i could not figure out how to remove the old seat so i just used the needle. Im not sure exactly how to adjust the fuel mixture either, i am inexperienced at this. Any help would be appreciated and i also want to say that i will be replacing stock plug with a ngk iridium and putting the pipe and k&n on soon if that helps to get a better idea of where im going and what i need help on.

[crfsonly]

make sure you have installed this needle:

16012-KPS-921

also, make sure it is installed correctly (fully seated on the clip. fuel screw should be opened 1 3/4 turns out to start with. also, you may have to go one larger with the main depending on your mods, altitude and temps.

ken

[dirtboy62617]

Thanks ken, i will be sure to do as you've said to check the needle size, and i know it seated all the way i made sure that i checked it before i put the carb back together. My main concern was whether or not i needed to replace the seat because i did'nt. Also i still have the stock fuel screw....might sound funny but last time i tried to adjust it ended up just removing the headpipe to do it, there is almost no way to get to it otherwise any suggestions here ?

[crfsonly]

also make sure your head pipe is installed correctly and the air boot from your carb to the head is installed correctly (no air seeping through the boot openings).

ken

[dirtboy62617]

How will i know if the headpipe is on correctly > it went back on same way as i took it off and doesn't sound any different so i am assuming its right....and the airboot is on all the way,also i refrenced the needle size and it is exactly what you said it should be. Now i need to play with the fuel screw and hope for the best i guess ? I have been told to turn the screw in and out and listen for the bike to hit the highest rev spot at an idle and that should be it ?

[VortecCPI]

If you still have a 42 pilot it will be too lean. Install a 45 pilot and the lean popping during decel will go away.

[Aussiecrf230]

If you didn't change out the jet for the needle it isn't really a problem unless the one in there is damaged or worn from old age or fuel with lots of abrasive particles.

Go the 45 pilot.
What year is your bike?

[VortecCPI]

If you didn't change out the jet for the needle it isn't really a problem unless the one in there is damaged or worn from old age or fuel with lots of abrasive particles.

Go the 45 pilot.
What year is your bike?

Correct - They are all the same. Some may tell you otherwise but we've measured them and they're all the same.