372xp won’t start.

[Craigb]

So even with petrol dripped in the carb it won’t start. It has spark but the ignition coil is 

510 11 57 02 serial number 

this on paper is the wrong coil. Is the timing screwed and I need a new coil or should this coil work and it is a different problem? Compression is fairly good but I have not tested it with a gauge.

[Stubby]

25 minutes ago, Craigb said:

So even with petrol dripped in the carb it won’t start. It has spark but the ignition coil is 

510 11 57 02 serial number 

this on paper is the wrong coil. Is the timing screwed and I need a new coil or should this coil work and it is a different problem? Compression is fairly good but I have not tested it with a gauge.

Has it run previously in your possession ? Or have you just acquired it ?   

Edited July 6, 2023 by Stubby

[Craigb]

Just acquired it. The saw is full of gunk so it looks like it ran with the coil but the serial number got me. That and it not running with petrol down the inlet bypassing the carb.

[Stubby]

1 hour ago, Craigb said:

Just acquired it. The saw is full of gunk so it looks like it ran with the coil but the serial number got me. That and it not running with petrol down the inlet bypassing the carb.

for spud and adw  @spudulike  @adw

[adw]

That sounds like the blue governed ignition unit, I think it should work, so if you have a good spark and the flywheel key is not sheared ( checked the key ) and fuel is dribbled through the inlet, and it still does not even fire, then I would be looking for a large air leak, possibly flywheel side crank seal, or it has blown part of the base gasket out, 

[spudulike]

I think it is a coil off a 576 but as ADW says, it probably will work. The compression should be 150-170psi when measured with a suitable gauge (not one for cars). 

I take it this is the old 372 and not the Xtorq, not that it matters much, many Huskys shared similar coils with the same case design but with different ignition advance ramp ups and rev limiter thresholds.

Check the piston out, all the gunk may be raising the feel of compression but not actually producing it.

A bit of WD40 down the bore, pull it over a few times without the plug in and then spin it over a few times upside down to drain any fluid. Clean the plug, heat it up with a plumbers torch and stick it back in then pull it over on choke WITHOUT using the decomp.

If it doesn't fire in 6 pulls, Knock off the choke, hold the throttle open fully and try a few pulls with the throttle wide open and pulling with the other hand. This is frowned upon, it can be dangerous BUT, it can prove an effective way of getting a saw firing if it is proving stubborn. 

A running engine needs fuel, spark and compression - the spark needs to be at the right time and the fuel needs to be vapourised in the correct manner. 

Report back with what you find.

 

 

[Craigb]

Blue indeed.

[Craigb]

[Craigb]

9 hours ago, spudulike said:

I think it is a coil off a 576 but as ADW says, it probably will work. The compression should be 150-170psi when measured with a suitable gauge (not one for cars). 

I take it this is the old 372 and not the Xtorq, not that it matters much, many Huskys shared similar coils with the same case design but with different ignition advance ramp ups and rev limiter thresholds.

Check the piston out, all the gunk may be raising the feel of compression but not actually producing it.

A bit of WD40 down the bore, pull it over a few times without the plug in and then spin it over a few times upside down to drain any fluid. Clean the plug, heat it up with a plumbers torch and stick it back in then pull it over on choke WITHOUT using the decomp.

If it doesn't fire in 6 pulls, Knock off the choke, hold the throttle open fully and try a few pulls with the throttle wide open and pulling with the other hand. This is frowned upon, it can be dangerous BUT, it can prove an effective way of getting a saw firing if it is proving stubborn. 

A running engine needs fuel, spark and compression - the spark needs to be at the right time and the fuel needs to be vapourised in the correct manner. 

Report back with what you find.

 

 

What is the reason you warm the plug?

[lurch_918]

25 minutes ago, Craigb said:

What is the reason you warm the plug?

because its cold outside he's nice like that .