Author Topic: Poulan 3400 carb settings  (Read 1192 times)

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Offline countryhog

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Poulan 3400 carb settings
« on: February 11, 2016, 05:36:10 pm »
Let me start by saying I hate HD- carbs.
Now, rebuilt this 3400 - carb, rings, lines, etc. deleted gasket and modded muffler. Starts well but loads up at WOT and commences with fluctuations in rpm at high rpm. also floods really easy.
Took the carb apart, soaked it again in solvent couple days, sprayed it liberally with brake cleaner, and adjusted the lever to couple hundredths below the recommended height.
Started it yesterday, revved it couple times and it still fluctuates. Shut it down. Tried to start it today. Naturally I engaged the choke. Big mistake. That thing flooded bad. Pulled the starter couple hundred times with throttle fully open. Sometimes it'll pop. I figure eventually it'll start. Ok fine
Question is - I have the L and H screws set at one full turn out. As per the shop manual. Wondering if, since gasket delete and muff mod, what the settings should be?
Did I mention I hate the walbro HD- carbs?
Thanks for any insight
now is never here but the past is always present.
semper fi ya'll

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Offline fossil

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Re: Poulan 3400 carb settings
« Reply #1 on: February 11, 2016, 06:06:43 pm »
Are you sure you have the correct gasket under the circuit plate?

 Also if it's leaking under the plate. it will run very rich. The manual says the fuel will bypass the mixture needles.
Tim

Offline countryhog

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Re: Poulan 3400 carb settings
« Reply #2 on: February 11, 2016, 11:27:26 pm »
Pretty sure about the gasket. Everything matches up.  Will take it down again to recheck. Aargh
now is never here but the past is always present.
semper fi ya'll

Offline ChipsFlyin

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Re: Poulan 3400 carb settings
« Reply #3 on: February 12, 2016, 12:20:51 pm »
With the muff mod I would  give the high a little more. Mine is about an 1/8 extra out.  It all depends when the saw 4 strokes out of a cut though. I also found that elevation can make a big difference from the  1 turn out manual  settings.   

The 3400 that I did was hard starting - After the carb rebuild one of the flaps on the circuit gasket was off alignment and catching.  I fixed that which made it easier to start but just not right so gave all the screws a tweak which solved the problem.
Mark

Poulan 2000, 2300 CVA, S25CVA, Craftsman 2.3 PS/VL (S25CVA), Craftsman 3.0/ Poulan 3000, Craftsman 3.3/ Poulan 3300 (2), Poulan 3450,  Poulan 3400, Wright 141A/401A,  Olympyk 284, Homelite Super XL 925,
Husqvarna 288XP

Offline countryhog

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Re: Poulan 3400 carb settings
« Reply #4 on: February 15, 2016, 06:46:58 pm »
New development. Gets curiouser. Rebuilt the carb again today. Tried to start it, no dice. Then put it on a known runner. Voila, started on first pull.
So now I have spark (plug out and grounded), fuel (wet plug), and air. I know the spark is not conclusive. Gonna swap coil with a known runner just for jollies.
Only other thing I can think of is I may have gapped the rings too wide. Had to file down a sxl set of rings.
This saw has never run consistently since the build. It's about to **** me off. Have no idea of compression but this thing has run with passion several times. Switch is good. As said, had good white spark today and it wouldn't start. Starting to see why this thing was laid aside before. Someone may get a good deal sometime
now is never here but the past is always present.
semper fi ya'll

Offline countryhog

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Re: Poulan 3400 carb settings
« Reply #5 on: February 23, 2016, 11:10:39 am »
replaced the new Champion plug with another new Champion plug. voila. cut all day with it yesterday. go figure
now is never here but the past is always present.
semper fi ya'll

 

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