Seized up stihl ms290

[a. palmer jr.]

It's a possibility you could have an air leak, assuming the correct air/fuel ratio and had the proper amount of oil in the fuel mix. Other things could be a crack in the intake boot or the pulse hose. You have to be careful when you put the engine together so you don't have a leak between the engine pan and the cylinder. Use good quality sealer on them and not rtv.

 

[HarleyT]

View attachment 543247 Just put in a new short block on a ms 290 same problem ran for about 10 minutes got hot and quit check compression 90 and good spark took off muffler and piston and ring fryed on exhaust side . Any help ?View attachment 543247

Post a pic of your fuel line. What about the carb? Did you rebuild it? Adjust it?

 

[a. palmer jr.]

Also, some of these complete engines you can buy do not have the bottom end sealed down, they expect the customer to do that..

 

[Kevin Urubek]

Post a pic of your fuel line. What about the carb? Did you rebuild it? Adjust it?

carb has limit screw can only turn about 3/4 turn . I sealed bottom end fuel line look ok .

 

[a. palmer jr.]

Sounds like you may have a Walbro, you can remove or trim the plastic limiter.

 

[Kevin Urubek]

Sounds like you may have a Walbro, you can remove or trim the plastic limiter.

Send engine back to ebay what place to recomind to get any engine my friend want it running only paid $80.00 for the long block .

 

[HarleyT]

Why are you sending it back???

 

[Okie]

Yep, read the previous post.

 

[HarleyT]

I did, that is why I asked with 3 question marks!!!

 

[HarleyT]

Hopefully he will tell us his E-bay user ID, so I can block him....

 

[a. palmer jr.]

I have several blocked...

 

[Full Chisel]

Well this thread has been a hoot to read. Definitely separated the knowledgeable posters from the wannabe armchair mechanics.

It amazes me how often the diagnosis is "lean seize" on here. Even after a piston pic of a pristine exhaust side!

The saw probably hydrolocked. Turning the nut on the flywheel freed it up. That would be my best guess from 1000 miles away...run it like you stole it, kill it and buy a better saw.

 

[Full Chisel]

If you want to see a lean seize, look at the pic posted on the previous page!

 

[HarleyT]

Well this thread has been a hoot to read. Definitely separated the knowledgeable posters from the wannabe armchair mechanics.

It amazes me how often the diagnosis is "lean seize" on here. Even after a piston pic of a pristine exhaust side!

The saw probably hydrolocked. Turning the nut on the flywheel freed it up. That would be my best guess from 1000 miles away...run it like you stole it, kill it and buy a better saw.

No, it is from a new poster inserting a new question/problem on an "old" thread instead of starting a new one.