Saw doesn't want to run at high rpm's? (Poulan 245A) [SOLVED] but a problem has reoccured.

[user 119840]

Dear community,

I was just going to make a quick check with y'all. As I have no way of showing you in a video what happens when I rev the saw at high rpm's, all I can do is tell with words. Basically, it sounds like it's about to die when I quickly squeeze the trigger and let go again. I suspect it's the H screw that needs to be adjusted?

Any reply with advice is greatly appreciated right now

 

[HarleyT]

back off your low first to see if it improves, but I would suggest that you go through the fuel system correctly, checking fuel lines and diaphrams, and for dirt/varnish.

 

[user 119840]

back off your low first to see if it improves, but I would suggest that you go through the fuel system correctly, checking fuel lines and diaphrams, and for dirt/varnish.

Hi there,

Strangely, it idles fine, and also runs on half rpm's good, but on high revs, it wants to die. The fuel lines are clean though, I'm suspecting it is the governor. Don't want to mess with it too much though. But, if I needed to remove it, and put it back for adjustments sake, can it be done? And can the governor be adjusted at all? Or is it just there to limit too high rpm's?

 

[redtractor]

Compression? I haven't seen a saw with a governor.

 

[user 119840]

Compression? I haven't seen a saw with a governor.

This Poulan 245A has a compression of 165 PSI.

 

[redtractor]

This Poulan 245A has a compression of 165 PSI.

Very nice! That just sprung to mind considering the age and that I'm always walking past the 306 sitting on my top shelf with a dead cyl.

 

[backhoelover]

check the exhaust screen could be clogged

 

[backhoelover]

gov ball could be stuck open. you also cant adjust them unit at wot no load. they have to be adjusted under a load to be adjusted right

 

[MS460WOODCHUCK]

Try to back the low out a 1/4 turn. If not better try to back the high out a 1/4 turn. If either make it better then adjust either to your standard. If not and you are sure the fuel system is good with new filter then there is a governor on the carb...it is the big brass screw on the side of the carb. You can remove it and block it off with a small piece of a aluminum pie pan.

 

[backhoelover]

got a like from hotshot that means im the man. thanks man that mean alot coming from a small engine master

 

[hotshot]

gov ball could be stuck open. you also cant adjust them unit at wot no load. they have to be adjusted under a load to be adjusted right

Yep. The skull kid likes to piss rev 'em on the gravel driveway, shown a while back in an old video...

 

[user 119840]

I have a spare carburetor that I can use from my older 306A, will try that one and see what the difference is.

 

[alexcagle]

Are You meaning it hesitates when transitioning from idle to high speed. Or that it misses when held wide open out of the cut?

Have you checked your carb screen for debris. That can cause a top end leanout.

 

[a. palmer jr.]

I think there's a thread somewhere on how to bypass/block off that governor, very easy to do and really helps the saw. I think you can block it off with a small metal disc like comes in a carb kit, I think you just unscrew the governor and put the disc in and put the gov. back on top of the disc. Better try to find the old thread to be sure..
I'm assuming of course that yours is the carb that came out with that valve..

 

[user 119840]

Solved... it was the carb... although this carburetor has NO governor. It runs smooth now.

 

[NorthernLonewolf]

*BUMP*

I got some trouble with this carburetor again. But now it's a reverse situation. My Poulan 245A ran at pretty high rpm's, and I tacked it at 7500-ish rpm if I remember correctly... and if I'm not completely mistaken, this is a bit on the high side.

I screwed the governor back into the carb all the way, and carefully sealed it with some gasket cement. Not sure if that's a good sealant in this case, but that's what I used. It was liquid-like, and said on the bottle it would take about 24 hours to fully seal.

 

[NorthernLonewolf]

*BUMP*

I got some trouble with this carburetor again. But now it's a reverse situation. My Poulan 245A ran at pretty high rpm's, and I tacked it at 7500-ish rpm if I remember correctly... and if I'm not completely mistaken, this is a bit on the high side.

I screwed the governor back into the carb all the way, and carefully sealed it with some gasket cement. Not sure if that's a good sealant in this case, but that's what I used. It was liquid-like, and said on the bottle it would take about 24 hours to fully seal.

I am using the governor-less carburetor once again. Tuned now to 8500 max rpm. I hope that's good enough.

 

[Old2stroke]

Your saw would have a more secure life if you would learn to tune by ear under load rather than rely on tach numbers.

 

[NorthernLonewolf]

Your saw would have a more secure life if you would learn to tune by ear under load rather than rely on tach numbers.

I can imagine that. Although I'm not using them that much, I will try to tune it under load next time. Thanks for the tip and reply!