WA55 Junior Sportsman Carb.

Ron Gordon · Joined: 27 Dec 2009 Posts: 150

My son will be starting this year in the Yamaha Rookie class, after running kid karts the last 2 years.

I read most places, that the carb settings for a sprint track setting on the wa55 should be around 2 1/4 L and 1/8 H. Is this about right?

I am also wondering about the idle screw on the carb.

Are there any adjustments I should be making on this screw as well?

Thinking is that this may aid him in the initial days of him starting out in this new class and engine, compaired to what he has always been used to in his Comer powered kart that idles.

What are you guys thoughts or actual experiances when you started your kids out with this engine package for your kids.

Any information and help you guys can give me on this situation for a kid comming out of the comer c50 to a kt will be greatly appreciated and will be passed along to several more dads to help our kids start out on the best foot possible this year in this class. AS they will all be new to this class and we look for all of them to grow and succeed together this year.

Thanks, Ron
_________________
Just another one of the Many OVKA Karter's
and OVKA Kid Kart Director

Saul Morse · Posted: Sat Feb 23, 2013 9:13 pm Post subject:

If I recall on the WA55 we usually ran the high side at around 1/2 (this was when we ran in Phoenix) and around 2 1/4 to 2 1/2 on the low. Hopefully others will chime in as well.

patrick slattery · Posted: Sun Feb 24, 2013 5:27 pm Post subject:

Ron set the low at 2 1/2, the high at 1/2. If it four cycles, lean the low down slightly and leave the high at 1/2.

Pat

Ron Gordon · Joined: 27 Dec 2009 Posts: 150

Thanks Pat and Saul, that what we will go with to start with...

Any thoughts on the throttle screw position,

thanks, ron
_________________
Just another one of the Many OVKA Karter's
and OVKA Kid Kart Director

Matt Overbeck · Joined: 15 Jul 2012 Posts: 21

Ron, good question about the idle screw.

I am not at all familiar with tuning a kt100. James single concern, and at this point the only reason he wants nothing to do with a Yahama, is that it doesnt idle. Is it possible to tune a kt to idle? I understand that this may not be an ideal tune, but it would be nice to have it behave more "Comer" like at least until he gets use to it.

Ron Gordon · Joined: 27 Dec 2009 Posts: 150

Saul Morse · Posted: Thu Feb 28, 2013 8:14 pm Post subject:

I don't recall what we did with idle screw either. When my daughter first started though I took a different tact to get it to idle...I adjusted the throttle stop so it was giving just a little gas (and not enough to engage the clutch obviously). I also adjusted the stop to not allow full gas after the first time she was in the kart and went bounding off across the desert...