12/18/2022 0 Comments Hooked on dirt race gear![]() ![]() Kick it once or twice without priming any more, and it should start. You’ll have to pull out the wet plug and replace it with a dry one, properly gapped. ![]() You can spot a fouled plug by the plug tip wet with fuel, and it doesn’t spark. If your mixture is way too rich, or you prime it too much, you just might foul a spark plug, especially with a two-stroke. With the extra fuel, it can be sucked up, and out into, the air stream more easily. When you kick over the engine, the airflow through the venturi passage can pick up the extra gasoline, because the fuel level is higher in the bowl. This causes the fuel level in the bowl to be too high for normal operation, but just fine for priming the engine. This opens up the float valve and lets gasoline flow into the bowl until you release the tickler button. When you push down on it, it reaches into the float bowl and forces the float downward. Some carbs, such as Bings or Amals, have a little plunger on the side, called a tickler. The vapor mixes with the air, and when the ratios are correct, it can be ignited with ignition spark To create a combustible mixture in the cylinder, some of the fuel has to evaporate and make a vapor. However, when it’s cold, the problem is that gasoline drawn into the engine tends to remain in liquid form and not evaporate. Just open the throttle part way, boot it, and it starts. When an engine is warmed up, it usually restarts easily. Here are some simple tips on how to dial-in your round slide. Perhaps the most prolific dirt bike carburetor of all time, the Mikuni round slide is a simple, dependable high-performance fuel mixer that is easy to tune. And, if nothing else, making your vintage dirt bike (or late-model dirt bike) easier to start and less prone to fouling plugs, will be worth the time to learn a few things. A basic understanding of this carb will make life a whole lot easier. Still, many dirttbikes equipped with the Mikuni round slide run poorly or are hard to start. ![]() In fact, just about every Japanese bike from the 60s and 70s came with this mixer. A huge number of vintage bikes come equipped with the good old round-slide Mikuni carb. All things considered, the round-slide Mikuni is an excellent carb, with a wide range of tuning capabilities. ![]()
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