This can cause seizures (where the piston expands from excess heat so much that it no longer will move within the cylinder) or can even melt the piston. The problem with a bike running lean is that not only are you down on power but more seriously the engine can run much too hot. If the mixture ratio exceeds this (perhaps the jet is too small or there is an air leak) then the engine is said to be running lean, or in other words the fuel/ air ratio needs to be altered so as there is more fuel in relation to the mass of air. Roughly speaking it's necessary for the mass of air to be approximately 13 times as much as the mass of fuel for the engine to burn all the available fuel and develop it's full power potential (and run safely and reliably). 'Jetting' your bike means tuning or adjusting the carburettor so that it is always supplying the correct ratio (mixture) of petrol/ air at all times to the engine. Can I jet my bike by doing plug chops? If so how ?įirst of all the boring stuff- feel free to skip straight to the 'ANSWERS TO THE QUESTIONS'.Will my moped use more fuel with an open air filter.Will my moped go much faster with an open air filter fitted?.My moped has a brand X air filter and brand X pipe fitted, what size jet do i need?.This blog is intended to help answer some of the questions we're most commonly asked about moped jetting. ![]() Part 1: Guide to jetting a Moped ! An introduction to the basics.
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