HUSQVARNA 324L

[Scrubcadet10]

got a husqvarna 324L,4cycle, that apparently has a Honda engine, that is stumping me. Randomly dying, sometimes can save it with choke.. Fuel lines were about done for.
replaced fuel lines, filter, spark plug. Disassembled carburetor, it was spotless inside and everything is in good shape.
It may run for 4 or 5 minutes at full throttle and slowly lose RPM and die, no saving it.
It may also die if i tilt it the trimmer head up, engine down. Or it may stay running.
checked for air leaks around carburetor are and none present. Spark stays consistent, though i am using a glow tester and not one where it has to jump the gap.
problem seems to be more consistent once warm.
Oil level is good.
I'm going to inspect p&C next and check compression
I have not been able to find a published compression spec
This is my first time working on a 4 cycle trimmer so any help is appreciated.

 

[Tiger Small Engine]

got a husqvarna 324L,4cycle, that apparently has a Honda engine, that is stumping me. Randomly dying, sometimes can save it with choke.. Fuel lines were about done for.
replaced fuel lines, filter, spark plug. Disassembled carburetor, it was spotless inside and everything is in good shape.
It may run for 4 or 5 minutes at full throttle and slowly lose RPM and die, no saving it.
It may also die if i tilt it the trimmer head up, engine down. Or it may stay running.
checked for air leaks around carburetor are and none present. Spark stays consistent, though i am using a glow tester and not one where it has to jump the gap.
problem seems to be more consistent once warm.
Oil level is good.
I'm going to inspect p&C next and check compression
I have not been able to find a published compression spec
This is my first time working on a 4 cycle trimmer so any help is appreciated.

Possible ignition coil problem. The coil is borderline and as it heats up, begins putting out weaker spark. Don’t spend a lot more time on it trying to figure it out.

 

[StarTech]

If this is like the GX25 then the compression should be between 131-150 psi.

 

[Scrubcadet10]

If this is like the GX25 then the compression should be between 131-150 psi.

Will be checking this morning. Thanks

 

[Scrubcadet10]

Compression shows 60 psi, but that's with an ACR bump on the exhaust.
Hooked my leak down tester to it.
There's a slight, noise of air at the dipstick hole, but I can't feel air moving at all....

 

[ILENGINE]

Compression shows 60 psi, but that's with an ACR bump on the exhaust.
Hooked my leak down tester to it.
There's a slight, slight, noise of air at the lipstick hole, but I can't feel air moving at all....

Honda compression check for that engine states to install compression gauge and pull starter rope with force several times and compression should be 131-150 as Startech posted. So unless you are just playing with pulling the rope your 60 psi is the issue.

 

[Scrubcadet10]

Not at all, i yanked it good. with throttle WOT ...
even still, with that low of compression, could it run fine for a few minutes then stall out?

 

[Scrubcadet10]

alright, this is with my leakdown tester hooked up, in the video i went from 40,60, to 90 psi.
Both valves are closed and the rocker studs are removed, there are definitely places in the cylinder where the air gets quieter and and louder. No air from the intake or exhaust.

 

[ILENGINE]

Not at all, i yanked it good. with throttle WOT ...
even still, with that low of compression, could it run fine for a few minutes then stall out?

When the engine warms up and the oil is no longer being held in the ring grooves compression could drop to the point that it stalls. Funny thing is they also claim that engine is a 8.0:1 ratio engine which puts the max compression at around 117 not the 131-150 they claim.

 

[StarTech]

Loosen whichever valve the ACR is on until it is no longer active. This should the ACR out of the picture. Kinda hard to pull at 2000 rpm but that is what they are taking the compression reading at.