I have a coolster 125 just out of warranty. It would not start, I traced the problem to the remote kill unit. If I unplug the unit the machine still will not. Is there a way to bypass this unit?

 

You bypass the remote module by unplugging it. You've done that and your quad still doesn't start, so you need to look elsewhere.

Do you have spark? Take out the plug and hold the plug threads against the engine. Turn on the ignition and crank the starter with the kill switches in the "run" position. Do you see sparking across the plug gap?