Does anyone have any suggestions for carb adjustments/mods. Here is my current set up- White Bros. slip on. Superbike Air force air box kit using their #1 jet, Head is polished/Ported, 12:1 Piston, I run 110 Octane fuel, K&N filter. Here's my problem no matter what I adjust I just can't seem to get it jetted right. I would really like to try someone else's Air box mod. I keep hearing how fast these Preds are and I just don't see it with mine. It's barely faster than a 400 EX! Also, has anyone put cams in and how do you like the performance?

Thanks, Quickscrambler

 

what size mainjet are you using?

 

have you cut your throttle return spring yet and also drilled out your vacum holes?

 

I don't know what size the main jet is Superbike Shop grinds the number off and identifies them with lines 1 line being their #1 jet, 2 lines their #2 jet and so on. I have " their" #1 jet and yes I cut the spring 21/2 coils off.

 

drill your vacum holes out also find the bit that fits in the holes and start drilling there is a lip on the inside of the holes that is what you wantto drillout

 

Quickscrambler, a 50 pilot, needle in the center clip and 180 main jet should be close on your set up. cut 4 coils off the slide spring and don't woory with drilling the holes. Now if your having trouble with a 400ex you have bigger problems. I would doublecheck cam timing, sounds like you could be a tooth off.

 

Would the spring/slide hole mod help a stock air box with a K&N(drop-in) filter? I have put the uni-vents in my box, but thats it....

 

yep!!!

 

Does this mod affect jetting? Will it make it richer or leaner? Just curious......

 

You will need to run a 50 pilot jet, leave the needle in the factory position. Main jet should be in the 160 to 170 range depending on how many uni-vents and your altitude.