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Husqvarna 550xp pop up

Discussion in 'Chainsaws' started by WoodsliverDan, Dec 4, 2018.

  1. WoodsliverDan

    WoodsliverDan Mechanical Beaver Builder

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    I checked squish today, @.025". So a little shy of my .020" goal. That's ok, I'll check timing numbers today since I have to head to work now. Hopefully I'll get it started as well..
     
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  2. WoodsliverDan

    WoodsliverDan Mechanical Beaver Builder

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    Tomorrow *
     
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  3. Farmchuck

    Farmchuck Super OPE Member

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    Hi guys, not trying to derail this but it sounds like a lot of 550 experience here. I have a 550xp which was ported by Randy & I love it, my only issue is that I’ve never owned a ported saw before & had no idea how LOUD they were. After running it a while I couldn’t handle the noise ( yes I do wear hearing protection) so I purchased a new factory muffler of Bob Spike60. I have had it on the saw for the last year or so, as you probably know it doesn’t run nearly as well as with Randy’s customized muffler.What I’m wondering is there an in between solution? Perhaps a way to modify the factory muffler to let the saw breath a little better but not be quite so loud. Also am I risking cooking my ported saw by running it with a factory muffler? Thanks guys.
     
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  4. AlfA01

    AlfA01 Powered by Olive Oil and FETA Cheese..

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    Have you had any issues with it not starting when it's hot? You can open the muffler a little bit to let some heat out without it being over the top loud.

    I've never had one of Randy's 550's so I'm not sure how he mods the mufflers. Most of these saws don't cook themselves from heat.

    The reason these saws had problems with scored pistons and cylinders were due to several factors.

    Air leaks, lean condition, too lean of fuel mix and dull chains are the usual causers of scoring. If you are running by Randy's suggestion - 40:1 Only, you shouldn't have a problem there.

    On another note. IIRC Randy drops the cylinder on those, which causes the exhaust not to fit just right. Make sure you elongated the lower bolt holes so you get a good seal at the cylinder.
     
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  5. Farmchuck

    Farmchuck Super OPE Member

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    C261628B-B84E-4E39-BB51-53190ADB7BEA.jpeg CEE0E250-323A-40BF-8427-9B8DB94AC478.jpeg No hot start issues. Factory muffler seems to fit fine with existing bolt holes. Can you explain in a bit more detail about the muffler modification you speak of? I’ve never attempted to modify a muffler before & I’d hate to mess it up.Here are a few pictures of the modified muffler.
     
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  6. Farmchuck

    Farmchuck Super OPE Member

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    Forgot to mention I do run @ 40:1 am soil saber & 90 octane e free fuel.
     
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  7. Farmchuck

    Farmchuck Super OPE Member

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    Not that I am trying to start an oil thread here or anything but if anyone has any better suggestions I’m all ears. Seems a while back I read Randy was going to try some am soil dominator, wondering if that is better than the saber?
     
  8. Farmchuck

    Farmchuck Super OPE Member

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    If these questions need to get moved somewhere else I understand. Not trying to derail but since we were on the subject of 550s I figured what da heck.:)
     
  9. Farmchuck

    Farmchuck Super OPE Member

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    9D27B9DB-3FB7-4260-B274-8D3F9153F77D.jpeg 81047101-511C-46EC-89B2-3567A74F2EEA.jpeg Perhaps these are better photos. I do love the way the saw runs with this muffler. Much Much better than with the factory one . Just wondering if there is some middle ground.:)
     
  10. Backtroller

    Backtroller Pinnacle OPE Member

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    I know what you mean about the loudness. It bothers some worse than others. These and the 562 seem to get loud with any muffler mod.

    I had a 2252 with a big 1” pipe and it ran great but using it for extended periods bothered me. I ended getting a new one and just opened it up under the factory baffle....but this was on a basically stock saw. Performance was a bit less in this situation.

    Now on a mmws I’m betting that performance is going to take a big hit without a free flowing muffler.

    Maybe foam plugs under muffs?
     
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  11. Farmchuck

    Farmchuck Super OPE Member

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    That’s what I wear for protection when I run it. For me personally one or the other alone isn’t enough.
    Can you explain in more detail what you mean by”just opened it up undythe factory baffle”
    I’ve never attempted to modify a muffler before.:)
     
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  12. Backtroller

    Backtroller Pinnacle OPE Member

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    I cut the baffle a little on each side with a dremel and bent the baffle open. I then grinded to make the “hole” as large as the area that the baffle had covered. So I basically made it open around the “tube” under the baffle. I then folded the buffle down and welded the cuts that I had made.
     
  13. huskyboy

    huskyboy Sorta a Husqvarna guy.

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    Try two 3/8 holes on either side of the one under the deflector. They get louder when you open the big internal baffle/diffuser whatever it’s called inside.
     
  14. Backtroller

    Backtroller Pinnacle OPE Member

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    Or that
     
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  15. Backtroller

    Backtroller Pinnacle OPE Member

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    That is probably the total area that I opened up. There isn’t much real-estate under the baffle since I didn’t totally cut off the baffle
     
  16. Farmchuck

    Farmchuck Super OPE Member

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    Is the deflector the thing that sticks up on the muffler with the screen inside?
     
  17. huskyboy

    huskyboy Sorta a Husqvarna guy.

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    Yes, make sure whatever you grind/drill is under the deflector. I just used pliers to lift it up to get room to work and then I tapped it back down with hammer. Make sure u get all the shavings out.
     
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  18. WoodsliverDan

    WoodsliverDan Mechanical Beaver Builder

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  19. WoodsliverDan

    WoodsliverDan Mechanical Beaver Builder

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    Got the wheel on it tonight, came out with 106-115-78 and stratos at 79. Figured that is an ok start, so I put new ring in piston and put carb back on. Popped after 6 pulls. Haven't put a bar on it yet, and since it was about midnight, it will have to wait til later this week. So far I'm impressed with the snappiness and compression.
     
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  20. Chainsaw Jim

    Chainsaw Jim CJ Saws, LLC

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    Stock numbers?
     
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