Please confirm diagnosis

[Bobby Kirbos]

My 2005 PP3516 is being stupid.
Symptoms:

1. Saw dies when transitioning from WOT to idle after the cut.
2. No matter how I dial in the low needle, the saw idles rich.

Diagnosis:
Time for a carb kit.
Yes? No? Other problem?

 

[HarleyT]

Time for a real saw......

 

[capetrees]

ouch

 

[Bobby Kirbos]

Time for a real saw......

I already have one. This is the backup for when I get the 490 stuck, and it will be my truck saw (as soon as I own a truck).

 

[capetrees]

time for a real truck

 

[s sidewall]

How does it rev up and how does it run in the cut? What are the needles set at?

Steve

 

[Bobby Kirbos]

Revs well and runs fine in the cut. I don't know where the needles are, but I've dialed in the low at least 1/2 turn with no improvement.

 

[s sidewall]

1/2 turn out is too low for a stratos saw, around 1 1/2 to 2.

Steve

 

[HarleyT]

As with any saw/brand. Go through the fuel system correctly first {yes, new kit as well}...

 

[Bobby Kirbos]

Ok, so for $10-ish, I can get an OEM rebuild kit. For $20-ish I can get an aftermarket kit - complete replacement carb, 4 feet of fuel line, fuel filter, and purge bulb.

Which way would you go - rebuild kit or aftermarket?

 

[s sidewall]

Go with the new carb. I don't buy many carbs, most of my saws, a used carb will run about 30 and still have to rebuild, no new or aftermarket around.

Steve

 

[Old2stroke]

I believe that carb has 2 check valves, one in the body where the idle circuit gets its fuel and another as a nozzle check valve on the high speed jet. If the idle one is sticking open or has been destroyed by cleaning with compressed air, it will have the effect you are describing when you go to idle after the cut. If the main jet check valve is defective, it will usually cause a variable lean running condition at idle. Are you sure the idle is too rich rather than too lean?

 

[Bobby Kirbos]

I believe that carb has 2 check valves, one in the body where the idle circuit gets its fuel and another as a nozzle check valve on the high speed jet. If the idle one is sticking open or has been destroyed by cleaning with compressed air, it will have the effect you are describing when you go to idle after the cut. If the main jet check valve is defective, it will usually cause a variable lean running condition at idle. Are you sure the idle is too rich rather than too lean?

Yes, I'm pretty sure it's rich. The idle speed drops when I pick up the saw. If I let the saw idle on the ground it will die. The only way to get it restarted is at throttle lock with no choke, and it's a pull-on to get it restarted. The smell of fuel is very present during the pull-on process. Once it does restart at throttle lock, it sounds like it's idling for a few seconds then starts to wind up to throttle lock speed - like it's burning off the extra fuel and finally winds up once it can breathe again.



I think I'll do the $20-ish kit from Amazon and do the fuel lines as well.

(I think the current Poulan offering that most closely resembles my saw is the PP3314.)
The rest of the saw is still in good shape considering the number of miles that are on it. It has an inboard clutch. It's not an AV saw, but the piston and cylinder look good. 42cc with an 18" bar - it pulls a full chisel chain through that silver maple like a MoFo. The only exception being that the front bar lug has started to pull through the plastic housing. I blame the stupid InTenz bar that I ran for years (not knowing any better). I've since changed it out to a clutch cover mounted tensioner. Like I said, it's a good spare saw, truck saw.

 

[HarleyT]

I may have a new oem carb for a 3314 laying around.....

 

[Bobby Kirbos]

I may have a new oem carb for a 3314 laying around.....

It's a Zama C1M-W26.

 

[HarleyT]

Can you put up a pic of it?

 

[HarleyT]

I think the one I have is a Walbro.

 

[Bobby Kirbos]

I haven't taken it off the saw yet. Here's one from the interwebs.

 

[HarleyT]

$20

 

[Bobby Kirbos]

Now I need to go out to the garage to pull the cover off and have a look.

Standby.