If your air screw is less than one turn from fully closed you need a larger pilot jet, if it is more than 2.5 you need a smaller pilot. Turn the air screw slowly in, and then out, until you find the point where the idle is fastest, stop there. Start the engine, speed up the tick over until you get a slightly fast idle speed. Using the air screw you can determine if you have the correct pilot jet, screw in the air screw fully then out roughly one and a half turns to start. Here are the corresponding throttle marks to the relevant parts of the carb. Now you can see which part of the throttle you are at (by looking at the mark on the grip against the throttle) when the problems occur. The best way I have seen to do this is to make a mark on your throttle housing and a small mark on your grip level with it, open the throttle fully and make another mark on the housing, now split the space in between the marks into four equal sections with two more marks. Before attempting to tune your carb you should always clean your carb, air filter, add fresh fuel and buy a jet kit (It is recommended by some companys to use genuine brand jets even if you are using copy carbs as the quality of the jets is very important and universal sizes are needed)įind which bit of the throttle the bike is not running properly at, this could be anything from dying when you first open the throttle to slightly bogging at 3/4 revs. If you are not familiar with which jets are which and where the needle jet is etc then see Johnr6's how-to guide “How to service the carb and change the jets”. 125cc engine would be upgraded to a 24mm carb) generally speaking if you are using a bigger carb for the engine it will be harder to dial in. If you are happy with the way your bike is running, but want to increase performance by buying a bigger carb then simply go to the next size up on the list (E.g. Take into account however that the more suited size carb you are running the easier the bike is to tune the carb. With a huge variety of Chinese/Japanese engines on the mini scene and hundreds of possible different carb/exhaust setups it is impossible to give any exact sizes or details of the correct jets and settings you need.
#Ducar 125cc pit bike mod
Setting up the carb properly makes a big performance increase as well so next time your thinking of buying a performance mod make sure your carb is set up properly first otherwise it could be sucking all your power. Badly setup carbs can also cause harmful damage if you go wrong such as overheating if the engine is running lean, backfiring with an over rich mixture etc. Hopefully this guide will help you to dial in your carburettor for maximum performance and smooth running throughout the rev range.
Setting up a carb on a pitbike can be quite tricky if your not sure what your doing, most of us have come across “problem carbs” before that for whatever reason just will not run right. Came accross this on the net and thought id post it on here as it is good advice imo.
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