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Post by edju1958 on Apr 1, 2020 8:18:55 GMT -5
I got my 925 running nicely with the HS26A carb I put on it,but while sitting there & idling I can hear what sounds like a "knock".There's nothing loose with the muffler or clutch.It seems to only be there when the saw is idling,or on a slight rev.Also,the chain spins while idling even though the chain is tight & the idle is set properly.If I turn the idle any lower it won't stay running.Rather than a connecting rod problem,could the saw be in need of a new clutch?It has a 6 shoe clutch on it now.I saw where the screws for the clutch cover started to come loose & started cutting into the drivecase cover.I tightened them up of course.
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Post by Clasec on Apr 1, 2020 8:38:35 GMT -5
I got my 925 running nicely with the HS26A carb I put on it,but while sitting there & idling I can hear what sounds like a "knock".There's nothing loose with the muffler or clutch.It seems to only be there when the saw is idling,or on a slight rev.Also,the chain spins while idling even though the chain is tight & the idle is set properly.If I turn the idle any lower it won't stay running.Rather than a connecting rod problem,could the saw be in need of a new clutch?It has a 6 shoe clutch on it now.I saw where the screws for the clutch cover started to come loose & started cutting into the drivecase cover.I tightened them up of course. Ed, The chain turning may be caused by a dry clutch drum bearing or a weak clutch shoe spring. The knock maybe a loose flywheel. |
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Post by edju1958 on Apr 1, 2020 11:43:36 GMT -5
Thanks for the input Charles! I've never had the flywheel off,so I don't know how it could get loose.Something I forgot to add - the saw will be idling just fine,then for no rhyme or reason it'll just shut off.
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Post by sweepleader on Apr 1, 2020 12:58:19 GMT -5
A loose piston or wrist pin can cause a knock at idle in a car engine, I doubt you could hear it in a two cycle though. Your noise is likely something much simpler.
The stalling could also be related to the clutch or clutch bearing grabbing or a loose flywheel causing loss of spart. I would go first with Clasec's suggestions before I tore the engine down.
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Post by edju1958 on Apr 1, 2020 18:33:41 GMT -5
It kinda dawned on me what the problem might be (clutch related) after I'd typed this thread.I don't know why I didn't think of it sooner.As soon as I get some time (busy time of yr.for me right now),I'll take the clutch off & have a look.I do remember taking the clutch off right after I got the saw to replace the rim.It was missing the clutch cover when I got the saw too.I don't remember if I greased the bearing or not when I put the clutch back on,but I've only used the saw 3 times since I got it running almost 1 1/2 yrs.ago.All 3 times were a short duration too.
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Post by 5terrysupersaws on Apr 1, 2020 22:04:53 GMT -5
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Post by edju1958 on Apr 1, 2020 22:08:06 GMT -5
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Post by edju1958 on Jun 21, 2020 16:31:16 GMT -5
Well I finally got around to the 925 today.I had a couple of different problems.1) The air filter cover never fit tight on the air box & I couldn't figure out why.I ordered a new air filter stud & then found out what the problem was.Some idiot had put a die on the stud & cut different threads so the AF nut wouldn't & couldn't tighten down properly.Once I put the new stud in & changed the nut in the AF it tightens down nicely now.2)The other thing that happened when I changed out the HS151A to a HS26A the air box grommet for the needles didn't line up anymore.I looked at the grommet on my XL-923 & figured that'd work,so I got one from Joyce (thank you Joyce!) & put that on & it fits nicely.3)The problem I had with the saw shutting off abruptly & the chain wanting to keep running had nothing to do with a dry bearing,one of the shoes was broken.I'm coming up with a part # 69754-1,but apparently there are several different variations of this clutch shoe - 69754-1,69754-1B,& 69754-1C.I have no idea what the difference is between the first two,but the last one, according to Leon,has no bevel on it & the other ones do(?) Fortunately I had another 6 shoe clutch from an old SXL-902 that fit right over.I'd like to get a replacement shoe to have an extra clutch on hand as it'd fit my 925,923,& 902 (maybe others too).
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Post by blythkd on Jun 21, 2020 21:41:14 GMT -5
Well that clutch shoe was undoubtedly your knock on this one.
When I'm listening for an internal engine knock, I take a shop towel and double it over a few times so it's several layers thick then hold it over the exhaust outlet with the engine at idle. You can hear the internals pretty well that way.
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Post by edju1958 on Jun 22, 2020 18:32:37 GMT -5
I put the saw all back together today & I've got the same issue with the clutch wanting to "lock up".I didn't take the clutch apart,I figured it was good to go on a visual inspection.This clutch may have a broken shoe as well.Maybe I can get enough good shoes from the 2 different clutches to make one good one,but while looking for replacement shoes I came across a couple of different styles of shoes.There's a beveled shoe - part # 69754-1B,& an unbeveled shoe - part # 69754-1C.I'd like to know if I can mix & match the beveled shoe with the unbeveled shoe?The clutch uses 6 shoes & Leon only has 5 unbeveled shoes.If need be I can pick up another unbeveled shoe on Ebay.
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Post by sawnami on Jun 23, 2020 7:57:49 GMT -5
I've got 23 of those shoes. I'm not sure what versions they are though.
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Post by edju1958 on Jun 23, 2020 9:05:24 GMT -5
I've got 23 of those shoes. I'm not sure what versions they are though.You might not have all the same style shoes,but Leon has assured me that it doesn't make a difference.I checked around on prices for these shoes & the price varied from $2.75-$12 ea.Most of the sellers had either only 1 or a package of 5.I can understand having one,but a package of 5?Doesn't make sense to me as the clutch uses 6 shoes. |
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Post by edju1958 on Jun 23, 2020 17:16:42 GMT -5
I pulled the clutch off the 925 again today trying to find out what the problem is & found absolutely nothing wrong with it.I pulled both springs off & pulled each shoe out to inspect for breakage & each shoe is sound & intact.I also tried to mix & match shoes from the original clutch & I thought it to be a no go.Both sets of shoes are beveled,but the beveling doesn't line up from one set to the other.I also found after closer inspection of the original clutch that the spider has a piece missing which very well could've contributed to the broken shoe,but not sure at this point.I'll get a pic of the spider on here & let you gurus decide. Edit:After seeing the clutch spider I've decided that it definitely needs a new spider.
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Post by edju1958 on Jun 23, 2020 18:20:35 GMT -5
I've also found that the 450 used the same clutch.I have 2 parts 450's in my shed,I'll need to find out 1st if they even have a clutch on them,& 2nd what style clutch they might have - 3 shoe or 6 shoe.
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Post by edju1958 on Jun 23, 2020 19:18:57 GMT -5
I managed to locate one of the 450's & it has a 3 shoe clutch on it.I suppose I could put a 3 shoe clutch on the 925 if need be.Any thoughts?I hate like heck to start stripping this 450,it's in pretty good shape & I think it could be a runner.It has no spark,so I believe the transformer is no good.I do have a couple transformers though.Lol It also has good compression.
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Post by sawnami on Jun 24, 2020 7:03:15 GMT -5
I've got 23 of those shoes. I'm not sure what versions they are though.You might not have all the same style shoes,but Leon has assured me that it doesn't make a difference.I checked around on prices for these shoes & the price varied from $2.75-$12 ea.Most of the sellers had either only 1 or a package of 5.I can understand having one,but a package of 5?Doesn't make sense to me as the clutch uses 6 shoes. I found out the hard way that they may not survive a drop on a concrete floor. That could explain the odd numbers. |
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Post by edju1958 on Jun 24, 2020 7:18:00 GMT -5
I guess that explains why you have 23 instead of 24.
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