Crappy tach seized my mom's saw

[CR888]

A tach is just a tool or aid that should not substitute proper knowledge of tuning. Relying solely on a tach is kinda foolish. Tachs don't seize saws, people and other factors do.

 

[mountainlake]

Tachs don't seize saws, people and other factors do.

Right. Steve

 

[Okie]

I pulled the muffler and it isn't seized but will not rotate past TDC. There were some ferrous nail clippings on top of the piston I can only assume ring fragments. The cylinder wall has a spider Web pattern on it. This saw doesn't seem worth a cylinder replacement to me being a glorified Poulan but what the heck do I know. Thanks for the info everyone you folks are a source of knowledge and inspiration

Probably not the tach that caused the issue.
If the skirt on the piston does is not scored up and down kinda sounds like maybe a piece of carbon caught the edge of the ring at the muffler port and broke the ring. Wonder if a small magnet or low pressure air.
A broken ring should be visible in the ring groove.

$200 saw vs fix or replace. Being family probably best to replace????

Piston and jug $50 at least (and your time involved) and might have carb or something else that would cause the issue to re-develop after installing new parts.
If you had another 235 you would have some spare parts.

Your mom may not get you a xmas present this year. Too bad is was not your bro in laws saw.

 

[Khntr85]

I just tune by ear in all my saws.....I like them clean up in cut!!!!

 

[jacrawley]

Well I pulled the cylinder and everything looks fine and the ring is intact. Not sure where the metal came from. A shop looked at it before me and said it wasn't worth fixing and advised buying a new saw. Perhaps they accidentally dropped something in there? I guess I will put it back together and see how it goes.

 

[TBS]

Did you check the recoil and the clutch?

 

[jacrawley]

Not sure what you mean by recoil?

 

[TBS]

Pull cord assembly. Did you try turning the crankshaft after you pulled the cylinder?

 

[kevin j]

is the top end needle bearing intact?

 

[Honda_man]

Check the crank bearings. I've seen the cage come loose on those. I've also seen a small baffle come lose in the muffler and fall into the cylinder.

Sent from my SAMSUNG-SM-G930A using Tapatalk

 

[Little Al]

Trying to tune a saw with a tach if the saw has a limited coil is a bit like playing Russian roulette,is it 4 stroking or the rev limiter kicking in, If you have the knowledge do it by ear.

 

[Okie]

Well I pulled the cylinder and everything looks fine and the ring is intact. Not sure where the metal came from. A shop looked at it before me and said it wasn't worth fixing and advised buying a new saw. Perhaps they accidentally dropped something in there? I guess I will put it back together and see how it goes.

Can you post a picture of the metal you found?

I'm wondering if the shop that looked at the saw was trying to make a new sale.