Troublesome MS660

[Mastermind]

I had a MS660 that I ported in 2012 come back for repair. It would not start......

The owner had put it in storage for a year. When he got it out, it would pop, but not fire up. He tried a few things, then let John King AKA T-Bone75 try to fix it. Finally, they gave up, an sent it here.

Ideas?

 

[Warped5]

 

[Mastermind]

Waiting for the questions to start.......you know. Did you try this....or that....

 

[Onan18]

New coil didnt fix it I assume? Thats a tough one. It doesnt have points hiding under the flywheel does it?

 

[Chainsaw Jim]

Mouse nest.

 

[Simondo]

This is just my way of thinking Randy so please excuse me if it sounds all to simple.
Without establishing a ...truth.. its a lottery of posable reasons.
Did it go into storage running good.
Was it dry stored...Fuel.
Those are 2 things that might point me in a given direction if i was in you situation . Thing is....the chap that has already given it what for i would think will have uncovered the normal stuff ....So at least you may have a list of things looked into...Ergo ...whats left .

 

[junkman]

I would check for spark ,then check for fuel feeding some down the carb throat see if pops ,but i think this thread must be beyond that point already .

 

[Jose A.S.T.S.]

Has the carb been reset or gone through had an 011 just yesterday wouldn't hit a lick rest the carb and she fired right up runs like a top, but I'm no expert....

 

[Fish]

Have compression?
Have spark?
Checked flywheel key?

 

[Four Paws]

Did anyone install an XP sticker and try again?

 

[Mastermind]

Have compression?
Have spark?
Checked flywheel key?

Compression 200psi
Good spark
Flywheel key is good.

 

[czar800]

Did it run out of bananas?

 

[junkman]

If he would have ran amsoil these problems would not exist .I blame the carb .

 

[Four Paws]

Fuel in tank?

Fuel and impulse lines in good shape?

Fuel/air mixture correct?
Air leak could be preventing saw from running, but still allow it to pop-off.

Intake tract/exhaust&muffler/transfers free of obstruction?

 

[czar800]

New plug?

 

[czar800]

Is the throttle and a choke working properly?

 

[Mastermind]

Fuel in tank?

Fuel and impulse lines in good shape?

Fuel/air mixture correct?
Air leak could be preventing saw from running, but still allow it to pop-off.

Intake tract/exhaust&muffler/transfers free of obstruction?

Half full of fuel.

Vac tested whole unit, then the impulse line, and the whole fuel line including the elbow and carb connection.

Rebuilt carb and pressure tested it.

No obstructions.

New plug?

Three different new and used plugs.

Now........one plug never showed spark, one showed yellow spark, and another was bright blue.

 

[Mastermind]

Is the throttle and a choke working properly?

Yes sir.

 

[Mastermind]

Also, I tried three different coils. And two different carbs. Tried blocking fuel off and just firing it on a shot of ether.....in case it was flooding.

Then I got a backfire. Still no extended run.

 

[Mastermind]

Mouse nest.

No sir.