sthil 026 rebuild gone wrong

[muddstopper]

I had a 026 sthil gave to me a few weeks ago. Straight gassed. I decided to do a cheap china top end, Warhawk brand. Put the saw back together, but it wont hit a lick. Checked spark, all good. Acts like it isnt getting any gas. impulse tube looks good and the boot between carb and cyl looks good. Fuel line looks good. I have worn my arm out pulling on it and it isnt even wetting the plug. I sprayed a shot of ether in the plug hole and the saw wont even hit a lick off ether. I am guessing carb. I dont have rebuilt kit for carb so I just threw the saw on the shelf while I get around to ordering one. Any other suggestions as to what the problem might be.

 

[vortec325]

Wonder if you got the timming off


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[muddstopper]

I never fooled with the flywheel, just replaced the P/C. Of course that doesnt mean the timing in the ports couldnt be off, but even a cheap top end should have the port timing close enough to at least crank. I think I will do a compression and squish check just to see if there might be more clearance than their should be. I bought a cheap kit once that had .80 squish and it didnt want to run either.

 

[HarleyT]

I would still take off the starter, and rotate the flywheel to tdc. Then see where the magnets are in relation to the coil.

 

[Deleted member 135597]

If you sprayed ether in the cylinder and it won’t even pop how would it be carb related?

 

[HarleyT]

If you sprayed ether in the cylinder and it won’t even pop how would it be carb related?

Well, flooded... Maybe....
But who could tell?

 

[Deleted member 135597]

Well, flooded... Maybe....
But who could tell?

He said plug was dry

 

[HarleyT]

Yeah, well......

 

[dmb2613]

put a little oil in the cyl just a bit

 

[user 122190]

Spark, fuel/air, compression...

 

[muddstopper]

I only sprayed a light mist of either in the plug hole, 2 cycles and either dont play well together so I may not have put enough for saw to hit. I dont think it is getting any gas and will have to check vacuum when I can get a guage borrowed. With the snow storm coming in tonight, I probably wont even mess with it until next week. Weather man is all over the map with predictions, anywhere from 2 inches of rain to 2 ft of snow. Probably get up in the morning and the sun will be shining

 

[pioneerguy600]

Regular fuel mix is the best primer, just a couple drops dribbled in the carb throat will get the engine to hit and run a couple seconds.

 

[trains]

If some 2 stroke mix makes it fire, have a look at the choke butterfly in the air filter assy, these can cause problems by not fitting correctly, and thus, not ensuring a rich enough mixture to start.

 

[lone wolf]

If some 2 stroke mix makes it fire, have a look at the choke butterfly in the air filter assy, these can cause problems by not fitting correctly, and thus, not ensuring a rich enough mixture to start.

Plus 1!

 

[Giles]

I never fooled with the flywheel, just replaced the P/C. Of course that doesnt mean the timing in the ports couldnt be off, but even a cheap top end should have the port timing close enough to at least crank. I think I will do a compression and squish check just to see if there might be more clearance than their should be. I bought a cheap kit once that had .80 squish and it didnt want to run either.

If a crankshaft seal has a total failure (like blown out), saw will not even pop regardless. I have seen this in many two strokes.
I do not feel that if seal was just leaking it would have this effect, but would certainly have start an run problems.

 

[Jasonrkba]

I definitely would have done the seals while I had it tore down. That being said if everything was done correctly while being assembled id say put a new carb on it or rebuild the original. Maybe while waiting for the kit pull the H/L screws out and spray some carb cleaner through all the holes. Buckle in, there calling for around a foot here and that's a lot for these parts.

 

[HarleyT]

Wouldn't at least checking the flywheel key be a good thing to do first?

 

[HarleyT]

I once knew a guy that started to pull the engine on his truck because he thought the engine was locked up.

Turned out to be just a locked up alternator.....

 

[pioneerguy600]

Easier to check for fire/spark first, if you have that then its easier to dribble a few drops of mix in the sparkplug hole and see if it hits after a couple pulls. Then if it wont fire up look deeper.

 

[HarleyT]

Well he already said he tried that.

well, ether.......