Does this looked like a scored P&C to you??

[Squatch]

i just rebuilt my carb replaced my fuel and Impulse lines. When I tried to fire up the saw first pull felt ok. The 2nd lacking compression and same on the 3rd. Checked compression and it’s ZERO! (I checked the gauge on another saw just to verify it wasn’t the gauge. Pulled muffler, piston looked fine. Tried to fire it again, bad compression and it won’t start. So I pulled off the cylinder (figured I could use a base delete anyhow) and here are photos of what I found. Thoughts and opinions? For what it’s worth it’s an 026.

 

[JimM]

View attachment 662652 View attachment 662654 View attachment 662656 View attachment 662657 View attachment 662658 i just rebuilt my carb replaced my fuel and Impulse lines. When I tried to fire up the saw first pull felt ok. The 2nd lacking compression and same on the 3rd. Checked compression and it’s ZERO! (I checked the gauge on another saw just to verify it wasn’t the gauge. Pulled muffler, piston looked fine. Tried to fire it again, bad compression and it won’t start. So I pulled off the cylinder (figured I could use a base delete anyhow) and here are photos of what I found. Thoughts and opinions? For what it’s worth it’s an 026.

Was it a runner before you worked on it?

 

[Squatch]

Was it a runner before you worked on it?

Yes.
Cylinder looks to be original. Based on the SN it was originally sold in 1997

 

[cuinrearview]

What prompted you to replace the rubber parts and re-build the carb? The piston and cylinder do not look scored to me. The piston has some wear. Maybe the ring end gap is too large.

If it ran before I would suspect the carb. If not i would start with new rings and maybe a piston.

 

[JimM]

Yes.
Cylinder looks to be original. Based on the SN it was originally sold in 1997

Just wondering. Doesn’t look hurt. Cu is on it.

 

[Deleted member 117362]

+1

 

[Squatch]

What prompted you to replace the rubber parts and re-build the carb? The piston and cylinder do not look scored to me. The piston has some wear. Maybe the ring end gap is too large.

If it ran before I would suspect the carb. If not i would start with new rings and maybe a piston.

It was idling bad, I found a crack in the impulse line. The saw is semi new to me. I didn’t know the history too well so I figured I’d rebuild the carb and replace the rubber parts.
Would a carb really cause a saw not to have compression?

I am definitely going to replace the Piston and rings while apart.

 

[Deleted member 117362]

It was idling bad, I found a crack in the impulse line. The saw is semi new to me. I didn’t know the history too well so I figured I’d rebuild the carb and replace the rubber parts.
Would a carb really cause a saw not to have compression?

I am definitely going to replace the Piston and rings while apart.

Short answer. No.

 

[Ozhoo]

Sure you didn't just shear the flywheel key?

 

[Squatch]

Sure you didn't just shear the flywheel key?

Yeah, it’s fine.

 

[Squatch]

Just wondering. Doesn’t look hurt. Cu is on it.

CU?

 

[Deleted member 117362]

Oz

Sure you didn't just shear the flywheel key?

Nice one. He better check that again.

 

[JimM]

CU?

I’m not a fan of stating the obvious. Cuinrearview.

 

[Squatch]

I’m not a fan of stating the obvious. Cuinrearview.

Got it! Didn’t notice the name.

 

[undee70ss]

I just can’t see zero compression with the way that piston looks. Does the saw have reed valves? A broken or stuck open reed will cause very low compression.

 

[67L36Driver]

Piston kit time. [emoji6]

 

[brandonstc6]

I would get a meteor piston kit for it.


Sent from my iPhone using Tapatalk

 

[Chainsaw Jim]

Zero compression?
I would say faulty decomp or loose spark plug. They don't run very good or make any compression with either problem. But with zero compression it's pretty much limited to that unless the rings are stuck in the groove which they aren't.

 

[Deleted member 117362]

Agree with the group saying ZERO?

 

[Squatch]

Just realized the older 026’s had a different fuel line compared to later versions. It went on fine, but definitely think I got the later version. Could that be root cause?