Backfiring through the exhaust

[RevB]

Lots of info on-line about waste spark ignition systems
AND
Onan's waste spark ignition system

Boy...that really cleared that up....so is a Kawasaki and tons of other two cylinder engines. Nothing special.

 

[RevB]

The onan engines are opposed twins

Some but not all...

 

[Forest#2]

I have replaced the twin tower ignition coils on some emergency generators during a emergency and the gen needed immediately by using two automotive coils by connecting the primary windings in series. (have to keep a heads up about correct polarity primaries when connecting in series)

Few years ago the Onan dual tower ignition coils were costly, not readily available and only available from Onan at prices higher than todays clones and long waiting period for a replacement.