General Product Question
hi my husqvarna 450 is giving me alot of trouble when i try...
General Product Question posted December 7, 2014 by dan o connor
1953 Views, 5 Comments
Question:
hi my husqvarna 450 is giving me alot of trouble when i try to start it,the pull cord didnt retract after i pulled it,1 dealer reset for me,2 same thing happened next day.3 same thing happened again so i gave out to him about this as the saw is only 6 months old he said it was the "helper spring" and it was out of shape and that he heated it and bent it back into shape.4 a few days later i pulled the cord and it froze so he replaced the pulled cord and fly wheel but now the compression feels to tough and to hard to pull and now i cant start the saw, any ideas what the trouble is now.each trip i make to him is a 35 mile return trip.
Answer
Sound like he put you back to an older 450 starter style. The problem is that the 450 II has a helper spring to overcome the high compression of the engine. If it is possible with the 450 II cylinder he may need to add a decompressor valve to make starting easier. This depends on how the new style cylinder covers are made and if there is an access hole for it. He may need to go back to the original setup using new springs as usually once a spring is sprung it loses it temper and will not hold its shape after heating.
Hopefully this all it is and that there is nothing else has gone wrong.
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450's have a crv. I can't imagine them illiminating it on the new model. the center arbor that the spring cassette and wheel slide over may have succumbed to the lack of recoil tension. travel on the recoil rope should never exceed 12 inches. a 6" pop should be the intended length of travel. if you consistently yank out 18" of travel then this issue will follow you forever.
if the arbor has broken, the cover must be replaced. if that model has a crv that works properly, it should be used. most saw makers send out the entire recoil assembly if a problem occurs. Husqvarna is not one of those. be gentle, sharp, and short on the recoil. it will last that way. pull out slowly until the engine rotates into it's compression stroke. then pull the trigger. this is the correct method.
if the rope ever starts to bind again, take a look at the youtube videos that explain how to re-tension the spring cassette. there are many "how to" videos to watch. anyone can do it. you don't need to be a mechanic to fix a recoil starter on any small engine tool.
good luck sir. keep it short and sharp on the compression stroke to avoid these problems.
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Robert,
I would have thought that too but since I don't have a 450 II in hand then I ended up replying on the ipls. The ipl for the 450 II doesn't show a CRV or plug off and I also reviewed the OM and there is no mention of using a CRV. I looks like they are went with a spring assist starting system. Same principle as those systems that being put on string trimmers which are nothing but trouble after they get some age on them.
Eugene
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Dan,
Sorry to hear that your having so much trouble, the Model 450 is a really nice chain saw.
Anyhow, Roberts suggestion to watch a few U-tubes on how to repair a recoil is a good idea, they really are very easy to repair. I don't like the idea of heating the recoil spring and re-bending it, I would have probably just replaced the re-coil spring, the only time I play with shortening the re-coil or re-bending them is If I can't find a new replacement spring for maybe an old or obsolete chainsaw, but that is Not your situation.
Next, Your last sentence in the same paragraph disturbs me, your statement "compression feels to hard and tough to pull ...". That really may be the initial cause of your problem. I like to do forensic and diagnostics of chainsaws, and sometimes what one individual describes as the problem is really just a symptom, but the real cause is much deeper. ie. Pull cord not working properly, etc.
Yes - You will need to fix the starter and re-coil housing or get a complete replacement (Note: Sometimes a complete starter can be obtained for the price of the re-coil spring) . But I would also suggest taking a close look at why the compression is tough and hard to pull, A 50 cc chainsaw engine, whether it has or does Not have a de-compression valve should not be that difficult to pull. I can pull a 72 cc engine chainsaw with No de-compression valve and get it to start on the first or second pull, anything bigger and I probably wouldn't be able to pick up the chainsaw, never mind pulling on the cord.
Sorry to digress, but back to your problem and your diagnosis, If your engine is difficult to turn over that will certainly cause problems for the starter, and you should only be pulling the starter one or two pulls to get your chainsaw started, Not an excessive amount of pulls (ie. 5, 10, or 15 times), because that means there is something wrong so stop pulling, or the engine is not tuned up correctly, and that goes for any small engine both 2 stroke and 4 stroke like lawnmowers. I realize your chainsaw is only 6 months old, but things can happen to small engines in very short order, so I'm suspecting that there is probably something wrong with your engine. I hope that I am wrong, because again a Model 450 is a nice chainsaw. The first thing I would suggest is remove the starter housing and set off to the side, we will fix that second. Next remove the muffler bolts, baffle plate & gasket, and muffler and either from the clutch side or the flywheel side, turn the engine over by hand. It should be relatively easy to turn but there will be some resistance which is the compression, you could also remove the sparkplug, and then there will be no compression and very easy to turn over( If it does not turn over easily then their is a mechanical problem internal to the engine). Oh, I also always put about a teaspoon or less of engine oil into the sparkplug hole to do this check it should make the engine turnover even easier. Look into the muffler exhaust port and make sure the cylinder, piston, and rings look like brand new. There should be No scratches or grooves or scoring of the piston, rings, or cylinder. You may need a small bright flashlight to look inside the engine, If everything looks good while rotating the clutch or flywheel and observing the piston movement, then put the muffler, baffel & Gasket, and bolts back together. If everything is Ok, then Just say "Thank Goodness, and Karla was wrong".
Now, re-build or replace the starter housing and re-install on the engine, with nothing found wrong with your engine, then your forensic diagnosis revealed that the only problem is just a starter problem, However If you don't do this and you do have an engine mechanical problem, then you will probably continue to be replacing starters.
I hope this helps, and If you need additional help please give me a shout.
PS. If your Not comfortable with disassembly of your New chainsaw, then I would recommend another Husqvarna Dealer, and ask them to both check your engine mechanically, and repair your starter, this should not take a lot of time maybe 10 or 15 minutes.
Also, I am Not a Husqvarna Representive or Authorized Repair, Just an experimental chainsaw person.
Karla
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Dan,
Just some follow up info, here is a link to a reliable Husqvarna Parts company ( I have personally purchased parts from them, and never had a problem). The complete starter assembly with free shipping is a very good deal, and I would definitely recommend this path of troubleshooting, you can easily replace this complete starter, I believe there is even directions in your owners manual on how to remove a starter. So check this link out: http://www.ebay.com/itm/New-OEM-Husqvarna-Chainsaw-Recoil-Starter-Assembly-504597002-/201234715776?pt=LH_DefaultDomain_0&hash=item2eda861480
I would still have someone or yourself check that the engine does not have a mechanical problem, and that there is no mechanical binding on the chainsaw that would inhibit the operation of the starter.
Again, Please let me know what you discover. Also having a few extra spare parts is a good thing, so save the old starter parts. If you have future problems with the starter say in 10 years, you will have some extra parts.
I am Not a Husqvarna Representative or Authorized Repair, just an experimental chainsaw person. Also I am Not affiliated with the company in the link.
Karla
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