Re: Re: no fire on H4 magneto

Posted by Steve Wisnewski on July 03, 2001 at 07:49:03 from (199.46.199.233):

In Reply to: Re: no fire on H4 magneto posted by Andy Martin on July 02, 2001 at 20:13:31:

The coil is easy to check with a VOM. Disconnect coil wire from points and condensor and measure the resistance from this wire to ground. I am assuming that other end of coil is grounded. You are just trying to verify that the coil has some resistance (not open). Do not get hung up the exact resistance. If it is NOT open the coil is probably OK. Mag coils are made up of many loops of real fine wire. The insulation on the wire tends to deteriate with time causing the wire to break and therefore an open circuit. Sometimes the coil will show a closed circuit when cold and will open up when hot. If the engine is running, chances are the engine will misfire when the coil opens up. I always check the coil first if an engine starts to misfire after it gets hot, but runs good cold. By hot I mean the engine has been running for several minute under load. Remember that the misfiring willget worse as the gap between the broke loops in the coil increase, eventually stalling the engine due to NO SPARK.

Follow Ups:

Post A Followup Name: E-Mail: Subject: Re: Re: Re: no fire on H4 magneto Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]