MS460 clone - no spark

[grizz55chev]

Was the flywheel removed by hitting the crank with a brass hammer? Just throwing it out there. Magnets can be re- magnetized with another magnet or electro magnet.

 

[bwalker]

No. A drop on the concrete or a very close lightning strike maybe. However , the lightning strike would likely kill the coil and any nearby electronics that wasn't shielded.


Reverse substitution is the only way to confirm the FW fix hypothesis. Do you still have the original?

No, I pitched it.
To be honest the machine went dead during a snow storm and I wanted it up and running ASAP. The motor it came off of had thrown a rod so it was shot. At the time I saw no need to save it.

 

[bwalker]

Was the flywheel removed by hitting the crank with a brass hammer? Just throwing it out there. Magnets can be re- magnetized with another magnet or electro magnet.

I used a copper hammer to remove both flywheels. The bad one had never been off since it was built.

 

[samaritan]

It has to be rare, but last winter my snowblower wouldn't start due to no spark. I first bypassed the ignition switch and replaced the plug with no good result. I then pulled the existing coil, which have a high failure rate and replaced it with a known good one. Still nothing. Baffled I decided to swap flywheel. Bingo, great spark.
I have zero idea how the flywheel went bad.

I have the same problem, but my flywheel does have magnetism, maybe its not strong enough, I've done what you have to start out., I have a new flywheel ordered

 

[jon@camano]

No. A drop on the concrete or a very close lightning strike maybe. However , the lightning strike would likely kill the coil and any nearby electronics that wasn't shielded.


Reverse substitution is the only way to confirm the FW fix hypothesis. Do you still have the original?

One thing I do is check for spark by turning the saw over with a drill motor (spark plug out) counterclockwise.

Jon

 

[Old2stroke]

One thing I do is check for spark by turning the saw over with a drill motor (spark plug out) counterclockwise.

Jon

Be aware that electronic coils have a minimum rpm that must be reached before a spark will occur. Drill might be too slow for some

 

[OM617YOTA]

Drill is way faster than pulling a cord.

 

[stihltech]

Drill is way faster than pulling a cord.

No it is not. You have a pulley advantage on a starter.
Been there and been burned by that.

 

[OM617YOTA]

What kind of drills are you people using? Mine will do 2000 rpms.

 

[Old2stroke]

What kind of drills are you people using? Mine will do 2000 rpms.

Some drills with a 1/2" chuck have a serious internal gear reduction for more torque but less top rpm and many cheap battery powered ones will not deliver top rpm under load.. All drills are not equal.

 

[OM617YOTA]

My cordless would do it just fine. Has more power than many corded drills. 1/2" chuck and high/low gears.

You all caught that he said without the spark plug, right? No compression.

 

[samaritan]

Well, so much for checking coils with a multimeter, I did, it passed the test, but it did not work when installed. I just got a new coil, and now I have spark.

 

[pioneerguy600]

Checking the modern coil`s /modules with a multimeter is about useless as the coil part of the electronic module may still be serviceable but most times it is the chip in the module that fails, it causes the module to fire, call it the on -off switch if that makes sense, it takes the place of the points that was essentially a switch, contact no contact or open closed.