I cut 4 coils off the spring in my carb. It is running faster now. However, I now have a studder if i try accerating (wot or loading situations) through a gear from low rpms. I have a dynojet jet (180) and neddle. I moved the neddle from to second clip to the first (leanest) and there was noticable improvement. Also after I tried this, I read that, in addition to cuting the spring that 1/8 holes have to be drilled. Will these hole fix my problem, or should I look somewhere else?

 

I think on the dyno jet needle you need to put it on the 3rd clip for best perfomance. It sounds like you are lean on the low to mid range.

 

1/8 holes should be drilled where?
I was never aware of this little tidbit of info..... someone please explain

 

Check this out. It explains it in detail.
http://forums.atvconnection.com/mess...=carb%20spring

 

Drilling holes or enlarging the hole in the bottom of the slide dates back to people tweaking the mikuni on Harleys. Somewhere along the line we ended up with two holes in our slide.

 

Bahazzz is yours stock and whats your sea level ?

 

So is drilling the holes a benefit or not? Worth the effort? any drawbacks?

 

Andrew Thomas, If you want to mess with the slide then drill a small extra hole and if it doesn't seem right then you could plug it. Much easier than resizing an overbored hole.
A few other things to try are other springs of various tensions, taper boring the carb, altering the vent hose diameter or necking it down to try to cure the slide flutter at full throttle.There are more parts to the jetting cicuits that I don't quite get-some brass vent ports in the carb opening. I would really like to talk to the Japanese engineers who developed this carb and see if anyone has really tuned it for performance.

 

My sea level is 400ft. I have a dynojet kit and a modified end cap. Other then that it is stock.

 

yeh by the time i'd gotten my carb tuned and kickin. my Lectron was already hear, but it was screamin i dom think the 1/8th inch holes did help. of course I dont know what kind of mods you have. still have carb and all jetts & neddels spings....