How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask JON Your Own Question
JON, Small Engine Technician
Category: Small Engine
Satisfied Customers: 526
Experience:  Husqvarna Service Tech
Type Your Small Engine Question Here...
JON is online now
A new question is answered every 9 seconds

I have a 16hp v twin and I think both coils are firing on

Customer Question

Hi I have a 16hp v twin and I think both coils are firing on every revolution. what stops them from firing at the top of the exhaust/intake stroke.This is a brand new engine .
Submitted: 5 months ago.
Category: Small Engine
Expert:  JON replied 5 months ago.

A spark plug fires at the end of compression stroke and the power stroke. Piston goes down and draws in air/gas. Piston goes up compressing air/gas mixture and spark plug fires. Piston goes down. Piston comes up and releases exhaust and spark plug fires.

The keyway in the flywheel and the GAP of the coil is what controls the spark. If the keyway shears and the flywheel turns just slightly, the fire will be off and it will not fire when needed and engine will not start.

I am not sure I fully understand what you are asking.

What stops plug from firing at the top or exhaust/intake stroke? The flywheel key, Flywheel, and the coil.