Author Topic: New 450 at altitude  (Read 652 times)

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Offline i82much

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New 450 at altitude
« on: September 03, 2014, 12:58:02 pm »
Hi all,

First post.  I have very little experience with chainsaws.  Just bought a new Husky 450 for hunting season in north Idaho, in the past we have had some blowdowns blocking the road and winching them out took forever.  We hunt at about 6500 feet elevation or so.  Does anyone know if I can leave the stock settings alone for the carb at this altitude and expect the saw to run reasonably well?  Doesn't have to be dead-on perfect, just functional for moving a few trees.

Thanks!

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Offline 660magnum

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Re: New 450 at altitude
« Reply #1 on: September 03, 2014, 01:44:58 pm »
I have to adjust the high needle my non computer chainsaws every time I use them for the temperature has changed. The limiters are removed from all the needle valves.

No matter what intentions the EPA had . . . . Chainsaw don't run correctly at different temperatures and altitudes.

Best to get the correct kind of needle valve screw driver just in case?
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Offline Cut4fun .

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Re: New 450 at altitude
« Reply #2 on: September 03, 2014, 01:54:43 pm »
Roger and others live out that way and I have sent saws there. Hopefully they chime in for their adjustments.

I lived in MT and remember the MX PE and Can-am dirt bikes having to be adjusted out there. I cant remember how though it has been so long.  Thinking they were lean and had to be richened up? Not sure and cant remember so wait for info.

Offline i82much

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Re: New 450 at altitude
« Reply #3 on: September 03, 2014, 02:37:31 pm »
Typically the air is less dense as you go up so carbs will run richer, if anything I would expect to need to lean it out?

Any idea where I can find one of these carb adjustment tools?  A quick google search turned up some discontinued Poulan product but nothing else. 

Offline Cut4fun .

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Re: New 450 at altitude
« Reply #4 on: September 03, 2014, 03:01:19 pm »
Told yeah I dont remember. Had it backwards. All I know is the big block monte and bikes needed adjustments. Couldnt remember which way.


I had to refresh my brain. copy paste

High Altitude Adjustments  a carburetor internal combustion gasoline engine at higher altitudes requires a bit of adjustments to the air/fuel mixture and a slight increase in the engine timing. Generally most vehicles are set at sea level and will operate somewhat smoothly up to 6,000 feet in altitude. The deal is, there's less air up there, so you need to "lean out" the mixture to maintain the proper fuel/air mixture.


Offline Cut4fun .

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Re: New 450 at altitude
« Reply #5 on: September 03, 2014, 03:02:42 pm »
I dont remember the 450 being spline for use of rednecked or oem special tool. I will check.   

Can you look and see on yours? slotted or splines?

Offline Cut4fun .

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Re: New 450 at altitude
« Reply #6 on: September 03, 2014, 03:06:54 pm »
Is your carb zama C1M-EL37B   My poulan 5020 that I think had same carb used the splined tool.

http://www.zamacarb.com/carburetors/10

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Re: New 450 at altitude
« Reply #8 on: September 03, 2014, 03:12:57 pm »
another http://www.hlsproparts.com/poulan-carb-adjustment-tool-p/530035560.htm  get 10% off but still more then above.


Offline i82much

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Re: New 450 at altitude
« Reply #9 on: September 03, 2014, 06:45:24 pm »
Yeah I ordered the tool from Amazon, probably should have checked the carb first to see if mine uses the tool ...

I don't want to mess with it, if it will cut me out of a jam I am content.  Sounds like up to 6000 feet should be ok so that is about the range I am looking at, I think the road goes up to 6500 feet but hopefully that 500 feet won't make a huge difference.

Incidentally, I'll be taking a carbureted 72 Chevy 4x4 pickup with us and hopefully will spend more time hunting than fixing carburetors!

 

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