Re: cosmo colt4

Silverfox Sullivan /
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The thing you are referring to is the decompressor. It is used when starting the engine. You pull in the handle and then crank the engine over. When you get the engine to spin you release the decompressor to start the engine.

And, yes, it acts like a "Jake Brake" on a large diesel engine.

On some large displacement two stroke enduro type bikes it is used to slow the engine when going down a steep hill.

Have you disassembled the carb and cleaned it?

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