Some by temp, some by humidity, some people just say "the air feels heavy today". Tuners like to monitor all sorts of environmental factors when evaluating which jet to use. The jets you now have in your PKT holder are all you'll ever need. Throw the rest away or put duplicates down the other side of the PKT Jet Holder. Now you can measure jets until you find jets that fit your pins from. So order these size Pin Gauges from McMaster: You can throw away any jet you have that this Pin Gauge will poke through. So according to the rules you can use a 60 size jet, and actually a large 60 that is just a but smaller than 61. WKA and Kid Kart Nationals use a "No Go" size of. What are pin gauges? These are basically little pins in various sizes you poke through the jet to figure out it's exact size. So what do you do? You buy a Jet Holder like this, then you go to Mcmaster-Carr and buy a set of pin gauges. First, did you know that the stamped number on top of a jet is practically meaningless? I honestly don't even know why they bother stamping them, they are rarely accurate. Proper Jetting - Here is some info that will likely change your entire outlook and effectiveness on carb jetting. In fact, buy the PKT Carb Retaining Bracket and then you'll have to tighten the carb even less, which is less risk of breaking it. We see people every year breaking carbs from being overtightened. When you put the carb back on the manifold tighten the retaining bolt just enough so that the carb is very hard to twist on the manifold, but you still should be able to twist it. Using brake cleaner (easier on plastic than carb cleaner) and air you can begin by blasting out every orifice in the carb with brake cleaner then blasting it clean with air, then doing the same to each part as you reassemble the carb. Finally, you can remove the fuel inlet cap to expose the filter screen under it, and remove the filter screen. Now pull the white float, and float needle out. Use something small like the end of a paperclip to slide that out. You'll see a little pin holding the white float in place. Next you will remove the two screws holding the black bowl at the bottom. You can turn it upside down at this point to drain out the excess gas. Remove the fuel line, then pull off the carb. Remove your K&N Filter, loosen the carb retaining bolt, remove the two screws holding the black throttle cable/slider assembly to the top and remove the assembly. If you carb still doesn't work after all this it may be time to retire that carb for the weekend and send it off to an expert.Ĭarb Cleaning - Cleaning Comer carb is a simple 10 minute task. Finally, check the internal filter screen on the carb for debris.
This is a good item to replace regularly. The float needle can form a ridge after a while (like a month) and stop working correctly. The other common reason that makes a carb not work is a bad float needle. One is your gas cap, is the vent working in it? Sometimes a gas cap vent will lock up essentially locking your fuel supply system so the engine starves of fuel. If these basics are covered and it is acting funny there are a few things to look for. If you have covered these basics then there really isn't much more you can do for the carb. Have it secured - so many people forget to tighten the retaining bolt and the carb falls off.
It is a good idea to take it apart and clean it before every important session like qualifying, heat races and finals.
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