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
  4. sp1ke

    sp1ke Member

    mine is the same these engines turn over fast and need to go pretty fast to get good spark upgradeing cdi coil wires leads plug will all help