JB - KT100 - WA55B or WB3A w/ .600 Restrictor Plate

[Keith Burnett]

I have an 8 year old who will experience karting for the first time. He will be running SCCA JB. I have a KT100 with the WB3A carb installed, rules state I would have to add a .600 restrictor plate. Or, he could run the WA55B. I have the carb, just need the intake manifold and the filter adapter kit.

Is there a "better" option? Is one easier to tune/keep running?

Any help/discussion is appreciated.

Thank you.

[Scott Boito]

If you get the WA55 carb set up, set it so it won't quite idle and won't quite stall when going off throttle at the end of a long straight. Then don't touch it. It's really a pretty good carb once you get it dialed in.

I can't speak to the WA3 with restrictor, but I imagine that it would be just as, or more, compromised than the W55.

Put a new plug in, set the WA55 to 1/8 turn on High and 2 1/4 turns on Low and try it out. Little movements can make big differences, so move in 1/16 type increments.
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BetterOffRacing
Member of the SCCA KAC

[Tom Reynolds]

I think most run/ran the smaller carb.

[Richard Jung]

Hi Keith,

We were the quickest JB KT100 at last year's nats, and the small carb works great once you learn how to set the 2 screws. At this point I would run it on the richer side to prolong engine life. Once he needs more power you can lean it out some. You''ll prob want a Mychron to monitor head temp/fuel mixture. I also found the the motor runs rich until it heats up, so I turn the low in for the first run.
Brian G. can provide much more info, if he sees this thread.

Rick

[Keith Burnett]

Thanks Guys...

So, I've decided to go with the WA55B.

I may see Brian G. this weekend, taking the kids the WDCR kart school, I think he is usually there. He has already helped me tremendously.

Thanks again.