66cc 2 stroke motor

Discussion in 'Electrical' started by green45machine, Dec 13, 2015.

  1. green45machine

    green45machine New Member

    I went through and checked everything and I only start to get fire from spark plug when I am turning motor really fast, no spark when turning motor at a normal speed, what can cause this

  2. crassius

    crassius Well-Known Member

    hard to say as many folks have diff ideas for 'really fast'

    several months ago, there was a flood of bad CDI units going around that got weak within a couple minutes of use to the point at which they would only spark at something like 20mph - a lot of talk about them in threads here & elsewhere, but haven't seen any like that since

    If you have no spare CDI to use as a test, I'd recommend getting one to try (if it doesn't help, you'll at least have a spare when you need it)
  3. butre

    butre Well-Known Member

    something is wrong in the ignition system. try replacing the mag and the CDI. there's no telling which one is out of spec without testing the mag with a multimeter