Question about Husqvarna , No.455 Rancher, 20" Gas - Powered Chainsaw

1 Answer

Husky 455 dies out at full throttle or under load

Saw starts and runs fine at idle. runs fine at half throttle under no load. dies quickly at full throttle or under load

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  • mrreyn00 Apr 14, 2009

    as Mr Fixit says, First, clean your air filter and replace the spark plug. then start with carb adjustment, next it could be dirty carb. I had the same problem with my 61, but after doiing all this (and I completely took my carb apart and made sure all passages and screens were clear), I was still having the same problem. Make sure to take note how to put it all back together. I put 1 gasket on backwards and covered up a hole that feeds the cylinder, believe me, your saw won't run at all then.

    If that doesn't fix it, it could either be blow-by in your piston/cylinder when putting load on the engine or the ignition system is going bad. If you have a compression tester, this is a simple process that will only take a few minutes. Otherwise, the strength of the spark may be your problem, not strong enough to power your saw under a load or at high rpm's.

    I have done all the cleaning and checking and found my compression to be a bit low. I took of my cylinder and had some light scoring along the exhaust port side. I ended up replacing my cylinger, piston, rings for $60 off ebay, nice kit from Kafar. However, once I got back to full compression same issue. It seems 1 of the 2 pieces of my ignition system were no longer able to deal with the extra compression (I have the god awful old 2 piece system and no way to test which one is bad)

    An ignition system must be healthy enough to fire a plug under compression. This seems to be my issue, since it is even more pronounced now with normal compression. Hopefully, you don't get this far along, but it could get this far.

  • Anonymous Apr 18, 2009

    The chaisaw will run fine while idleing but as soon as you increase the throttle it dies out

  • Anonymous Apr 20, 2009

    I have the same problem only it is more pronounced when the saw is hot. Seems to run and cut much better when it is first started.

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  • 7 Answers

Your carb may be the issue but your ignition coil could be the culprit. Once they start going bad, they can act up intermittently or give various symptoms from day to day. The fact that your saw dies at full load or under load, probably means that when your saw gets hot or requires more spark, your coil is not able to provide it. Your carb is easy enough to clean out, you can take it all apart and clean all screens, etc....

I just replaced my coil due to the exact same symptoms and now my saw runs great. $60 off ebay and you can put it on in 15 minutes yourself. Check your carb first though

Posted on May 03, 2009

  • mrreyn00 May 07, 2009

    REPLACE YOUR FUEL LINE!



    I thought my saw ran great, but it died once I ran it at full throttle for a few sec's.



    IT WAS THE FUEL LINE. A simple and cheap fix, takes minutes with right tools. Popped it in and my saw runs better than new, given I've replaced about everything.

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hi

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by for now savumihai71

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