Heeelllp! Need guidance on newish Husqvarna 450

[david newbie]

I got this saws as a trade form another member, looks like new, and piston is pretty much perfect. Other member was able to get it to pop sometimes, but not run. He checked the following things.Compression, spark, flywheel key, vac and pressure, no holes in the intake boot. He suggested I try another coil, so I found a used one on ebay. Now, it will almost run, but very slow and will sputter and die within 10 seconds or so. I removed the muffler, wondering if there was an obstruction, no change. Almost felt like the brake was on, but noooo... I removed the fuel filter, no change. Tried adjusting the carb some, but no change. It does seem to start fairly well, but no high idle like I would expect on starting. Oh, and if I touch the throttle it pretty much kills it. Has anyone else had this problem? If you are the smart problem solver, you may be entered in a drawing for a non running Wild Thing!!

 

[singinwoodwackr]

At least you got it to idle…much better luck than I had

 

[huskydave]

I got this saws as a trade form another member, looks like new, and piston is pretty much perfect. Other member was able to get it to pop sometimes, but not run. He checked the following things.Compression, spark, flywheel key, vac and pressure, no holes in the intake boot. He suggested I try another coil, so I found a used one on ebay. Now, it will almost run, but very slow and will sputter and die within 10 seconds or so. I removed the muffler, wondering if there was an obstruction, no change. Almost felt like the brake was on, but noooo... I removed the fuel filter, no change. Tried adjusting the carb some, but no change. It does seem to start fairly well, but no high idle like I would expect on starting. Oh, and if I touch the throttle it pretty much kills it. Has anyone else had this problem? If you are the smart problem solver, you may be entered in a drawing for a non running Wild Thing!! View attachment 1180791View attachment 1180792View attachment 1180793

Try pouring a small amount of premix in the spark plug hole and see if it runs normal for a bit.

 

[heimannm]

My guess is that the coil it the issue still. I had a 435 that acted pretty much the same, new coil fixed it.

Mark

 

[david newbie]

My guess is that the coil it the issue still. I had a 435 that acted pretty much the same, new coil fixed it.

Mark

do you remember if it was oem or aftermarket? (the new one)

 

[huskydave]

I would not put an aftermarket coil on it personally, if that is what it needs. I get saws in all the time with aftermarket coils that died quickly. The coil will sometimes develop a crack and when the saw warms up a bit it will ground out to the case. I asked you to try a little fuel in the jug first because it could also be a fuel delivery problem, this would rule out the coil if it runs well. In that case you would only have to rebuild the carb and check the impulse/fuel line, both cheap fixes.

 

[coffeebrk]

This ^^^^
I'd Also put pressure in the fuel line and see if it holds.

 

[david newbie]

I would not put an aftermarket coil on it personally, if that is what it needs. I get saws in all the time with aftermarket coils that died quickly. The coil will sometimes develop a crack and when the saw warms up a bit it will ground out to the case. I asked you to try a little fuel in the jug first because it could also be a fuel delivery problem, this would rule out the coil if it runs well. In that case you would only have to rebuild the carb and check the impulse line, both cheap fixes.

I tried fuel in the plug hole, and haven’t decided if made a difference, tricky as it just runs for 2-3 seconds, so a little hard to tell. I need to try again

 

[singinwoodwackr]

I tried fuel in the plug hole, and haven’t decided if made a difference, tricky as it just runs for 2-3 seconds, so a little hard to tell. I need to try again

That's about all you'll get. It won't run for more than a couple seconds on a splash in the plug hole.

 

[david newbie]

I tried fuel in the plug hole, and haven’t decided if made a difference, tricky as it just runs for 2-3 seconds, so a little hard to tell. I need to try again

Tried it again First time a standard start and second time priming the plug hole. Both times I noticed the plug seemed wet. It may have possibly run closer to normal, too brief to tell. It definitely dies if I squeeze the trigger So maybe I will rebuild carb first a see if that does anything. Not quite as nice to work on compared to a 350.

 

[cookies]

These may have tygon fuel hoses from the primer/carb/tank that get cracks you can not see until removed and looked through with light or they get hard and allow air past the connections...I would dissect the carb looking for fueling issues and install a new kit in it.

 

[ballisticdoughnut]

Pull the fuel filter and pressure test the entire fuel system. If it fails you’ve got a leak somewhere. If it passes rebuild the carb.

 

[heimannm]

Bad coil was original Replacement coil was AM, sold it to a local guy and he's never brought it back with a complaint. I'm sure it's been over 5 years and he runs that saw regularly.

Mark

 

[Wood Doctor]

Interesting that I am working on a Husky 450 Rancher today in the shop. It operates flawlessly. The owner chewed up two chains by not using the tensioner correctly and then running the chains so loose that they kept flying off. The pin on the tensioner was simply pressed against the bar rather than inserted into the bar's tensioning hole. I was able to save both the chains with careful machining.

The model in OP''s pic is newer than the one I am working on as evidenced by the flippy caps. Believe me, this saw is worth fixing. The 10 year-old engine in my shop runs flawlessly.

 

[david newbie]

pressure tested the fuel line in the tank through to the carb, no problem. Then I rebuilt the carb.... No change in how it runs, although the metering diaphragm was quite stiff. So regardless , it needed the rebuild.. On to the AM coil next

 

[Chevboy0167]

Worked on my plant managers Husky 460 last summer. Among other things, had a slightly pinched fuel line going into carb. from factory.

 

[Tomos770]

Go on YT....." The greasy shop rag " has covered all the problems of 4xx Huskies...

 

[coffeebrk]

What is the compression?

 

[david newbie]

Piston looks pristine to me. I have not checked compression, but the member I got it from did. Not low

 

[Crftrapper535]

Sounds like fuel issues I remember when I fixed my buddy's husky 450 had the same issue and all I did was clean the fuel tank put new lines in new filters new carb and then he had me put a different muffler on it