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Solo 644

Discussion in 'Chainsaw' started by buzz sawyer, Nov 30, 2017.

  1. buzz sawyer

    buzz sawyer Addicted to ArboristSite

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    A friend of my wife just gave me a Solo 644. P&C looked good so I commenced to cleaning about 1/2 pound of gunk from the inner reaches of the saw. Saw starts and runs OK. I had to dress the bar rails and decided to paint it as well. the back end of the clutch cover is broken out and I need a new rim sprocket. This has .325 chain and rim sprocket is .325 8 tooth. Is that too high for this saw? I was surprised it was not a 7 tooth.
     
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  2. SoopermanLuva

    SoopermanLuva ArboristSite Member

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    I'd say it's adequate and the saw has enough power. The .325 is a smaller tooth than your usual 3/8. I found that the standard for most saws of that displacement and output is either a 7 tooth 3/8 or an 8 tooth .325 sprocket. So manufacturers seem to consider them about equal in performance requirement.
     
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  3. buzz sawyer

    buzz sawyer Addicted to ArboristSite

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    Thanks! Here are some photos.
    solo 644-1.jpg solo 644-2.jpg solo 644-3.jpg
     
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  4. burnses

    burnses ArboristSite Guru

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    cool always nice to see something other than the big two manufactures...
     
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  5. 7sleeper

    7sleeper Addicted to ArboristSite

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    Excelent saw still made in Germany quality!

    7
     
  6. SoopermanLuva

    SoopermanLuva ArboristSite Member

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    Nice saw! I like that boxy old school style. Great job cleaning it! Looks almost brand new now.
     
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  7. Conquistador3

    Conquistador3 Le Comte de Frou Frou

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    That saw family (644, 651, 656 etc) came with a 7T sprocket: some models came with a rim sprocket and others with a spur one. I am 90% sure the 644 came with a rim type sprocket.
    So it's running an aftermarket sprocket. ;)
     
  8. SoopermanLuva

    SoopermanLuva ArboristSite Member

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    Interestingly there is no 8 tooth sprocket listed in the manual. http://www.solo-germany.com/gba_download/9644131/web/9_644_131_en_web_11_2007.pdf
    So yeah, I agree, definitely aftermarket. But like I said, the saw should pull the chain just fine. I see people switch to a smaller pitch so they can get a bigger sprocket and get the chain speed up. Unless you're running a really big saw, speed always beats tooth size.
     
  9. buzz sawyer

    buzz sawyer Addicted to ArboristSite

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    I don't know the history of the saw. It is a rim sprocket, not spur. Had it running today but it is DUMPING bar oil through the oiler. Thought I had a leak where the hose enters the oil pump but I resealed it and it's not leaking. Pump is set to minimum. I even machined a restricted nozzle for the outlet - the hole dia. is 0.04" / 1.016mm, and it still seems like a lot is coming out. Need to check the ipl to see if something is missing. Thanks for the ipl link SoopermanLuva!

    The plus side is, I'm getting about 13,500 at wot and still have a good 4 cycle sound. H screw is out about 1-1/4". Bad side is, I didn't get to cut with it yet because of all the oil.

    Oh, yeah, I got three good Stihl and two Oregon chains with it. I noticed the bar shows 66 DL but the chains are 67 DL - like maybe they added a link for the 8T rim.
     
  10. buzz sawyer

    buzz sawyer Addicted to ArboristSite

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    Just realized the link is for the owner's manual, not a IPL. Anybody have one they can share or send me the page showing the parts for the bar oiler system?
     
  11. SoopermanLuva

    SoopermanLuva ArboristSite Member

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    I was checking both user's manual and IPL. You want the IPL? Here ya go. :)
     

    Attached Files:

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  12. buzz sawyer

    buzz sawyer Addicted to ArboristSite

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    Many Thanks!!!
     
  13. buzz sawyer

    buzz sawyer Addicted to ArboristSite

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    Found the oil leak - from where the oil pump attaches to the oil tank. I cleaned the surfaces and applied a thin bead of rtv. Will check in the morning. If OK, maybe I'll finally get to cut with it tomorrow. I repaired the back of the clutch cover with stainless mesh and JP weld. Seems pretty strong. If it cuts strong with the 8 tooth, I'll use it. If I go to 7 tooth, the chains may be 1 dl too long.
     
  14. buzz sawyer

    buzz sawyer Addicted to ArboristSite

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    Leak stopped. Put it back together and this thing is quite impressive for a small saw. The 8 tooth rim is fine.
    Even with the restrictor I put in the oil line, the chain is getting plenty of oil at the minimum setting. I cut the top end down to about 13k.
     
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