"Bandit" (2bandit)
12/13/2014 at 17:16 • Filed to: bandit racing
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"Bandit" (2bandit)
12/13/2014 at 17:16 • Filed to: bandit racing | 7
| 11 |
Today I woke up and tried to get my race kart to run for the first time in three years. I've got a lot of carb tuning to do, there's an electrical glitch in the wiring that's preventing spark every now in then, and there aren't really any brakes. Not bad for someone who has no karting or 2-stroke experience though.
TDogg
> Bandit
12/13/2014 at 17:18 |
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Nice! That'll be a fun toy. Do want.
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Bandit
> TDogg
12/13/2014 at 17:22 |
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I've got 130 days to get it race ready. In that time I'll need to bring it up to current specs and get it running reliably. I really need sponsorship for the team because, well, this kart is so old and broken it really needs to be replaced and all the safety equipment needs to be replaced as well. I only have about $500 to spend for the year on everything, but no matter what we're going to be having fun.
Daniel Justice
> Bandit
12/13/2014 at 18:09 |
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Looking good, are you running the stock carburetor on your KT? The WB3A is a piece of work, especially with an expansion chamber.
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Bandit
> Daniel Justice
12/13/2014 at 18:12 |
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Required to use the WB3A so that's what I've got. I'm not sure what the adjustments do on it. I'm pretty sure the tall one is air/fuel mixture but I have no clue about the black one.
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Daniel Justice
> Bandit
12/13/2014 at 18:36 |
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That's what I figured, as most KTs run them, though there is one for juniors (WB55). Like I said, these carbs are very finicky, they don't have jets like other racing carbs. Some advice though, as I don't want anyone else to melt two KT100 pistons like I did, but with an expansion chamber you have to constantly adjust it out on the track. The blue needle pictured, or the taller needle, is called the low speed needle, used when pulling out of the pits and in low RPM turns. The smaller L shaped one is the high speed, adjust it on the straights when the engine is screaming at 13k. Twisting the needles will lean or richen the fuel-air mixture. Like I said, this year I melted two pistons from not adjusting the high speed needle. Here is one of the incidents (skip to 15:25).
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Bandit
> Daniel Justice
12/13/2014 at 18:38 |
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Oh, that's not good! Also, very interesting that whole system of adjusting it. Any suggestions on setting them? Like number of turns out? I don't know what a good starting point is.
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Daniel Justice
> Bandit
12/13/2014 at 22:37 |
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You have other factors that are set inside the carb too, the pop off pressure and fulcrum arm height. I'm by no means experienced with it (I'm the driver, my dad and any helpful bystanders are my mechanics), but I have some basic understanding of it. If the engine is bogging, open up the low speed. When you are on a straight and the engine is revving high, you open up the high speed, and close it when you get in the turn. Try finding a kart engine builder/blueprinter around your area, they can educate you and set your carb to race spec. Or if you can't find anyone, do what I did and dig into ekartingnews.
http://eknclassic.com/search.php?mod…
Type in WB3a and set the forum search to 2-cycle racing.
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Bandit
> Daniel Justice
12/13/2014 at 22:52 |
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Thanks! That makes a lot of sense. I'll read through those pages later. I can't get it to idle so that'll probably be my first task to fix.
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Daniel Justice
> Bandit
12/13/2014 at 23:15 |
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You're welcome, and actually I have another link for you. If you're looking for a setup that idles and doesn't really require on track adjustment, I found this a while back.
http://karting.4cycle.com/showthread.php…
I've never tried the build, but it looks good. Let me know how you do out there.
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Bandit
> Daniel Justice
12/13/2014 at 23:57 |
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Hmm... interesting! Come spring I'll be looking for a good race set up but that build looks interesting
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Daniel Justice
> Bandit
12/14/2014 at 15:34 |
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Yeah my racing starts up again in April-May too, we have 5 WB3as so there's plenty to experiment with. We might not run the expansion chamber next year, just to avoid the costs of melting engines.