Yes,older.The bottom seems fine. Should get the jug next week,so I'll see if I went the wrong way.
Husqvarna 50 big-bore upgrade question
- Thread starter Axlerod74
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Yes,older.The bottom seems fine. Should get the jug next week,so I'll see if I went the wrong way.
I can not say for sure because I gave it to my landlord after I fixed it, he had given it to me first because of the top end damage. I will check my pictures when I get home, I may have a photo of the serial number.
SawTroll
Information Collector
Yes, there was a change to the case in 1989 week 19, when the 50 Special came out - the 51 and 53cc cylinders don't fit the older saws.
Stihl Crazy
ArboristSite.com Sponsor
Which would be the best route, open the case or turn down the sleeve to fit?
Got a few 50's and P5000's that I want to put 55 cyl's on.
Got a few 50's and P5000's that I want to put 55 cyl's on.
In my opinon it is easier to work on the cylinder. Working on the case will involve metal shavings inside the crankcase and into your bearing.
Did the bolt holes line up and were they the same size fasteners?
The bolt holes did line up and the bolts were the same size. The only thing I forgot to mention is to make sure you take equal amounts of material off each "lip", could end up with all kinds of problems otherwise. The saw I worked on was one of the later black top models, can not say if it can be done on the early white top ones.
MechanicMatt
Cut Split Stack Burn
what are you doing with the old P5000 cylinders and pistons??? And how scored are they??
God only knows I have done my share of redneck modifications, but if theres alot of material too take off, sounds like putting it on a mandrel in a lathe might be a good idea.
No doubt if its not alot and your careful you can do it without one though.
Winn R
Rambling Wreck
I've done the case instead.
It's 1mm off the case all the way around. The new cylinder can be held with the bolts on the case, dykem sprayed around it. It still takes a little scribing but magnesium removal is easy up to the line.
Stuff the case with rags and wash well.
I'll try to be brief here but this is what I have found out so far. My 50 (gray top) is a 1987 model with the 44mm piston and cylinder. I took the piston and cylinder off to get a good measurement with calipers. The crankcase opening comes out to aproximately 50.6mm diameter. According to the service file that modified mark sent earlier (thanks again Mark, this has been very helpful) that should be plenty big enough to fit the 46mm upgrade. Intrestingly enough, according to the service file, my serial # 7160XXX should fit well into the older models that should have the smaller 48.5mm opening. The saw is all original and my Dad is the original owner so no funny business there. So I found an old 46mm cylinder (scoured) off a 55 that I had for a parts saw (1995 model) and compared the bottom cylinder openings of the two. The 46mm was noticably larger at the base. I slid the 46mm down over the connecting rod on the 50 case and it dropped right in. Then I checked the bolt hole pattern and all 4 cylinder bolts matched up. Not sure why there is a discripency in the serial number info from the service file or year of production info that sawtroll sent. I am now very optimistic that the NWP 53cc upgrade kit ordered from Baileys will probably fit. I'll let you know when I find out more.
On mine both saws had the same size fasteners............the 55 had 4mm allen head and 50 has 5\16 hex head fasteners but same length and thread.
The serial number on my saw was 5155017, sliver tag. I believe that translates to 1985 week 15. My landlord bought the saw new and his son straight gassed it along about the third tank. I installed a used 51 top end and a new bar/chain then gave it back to him around Christmas time.
Stihl Crazy
ArboristSite.com Sponsor
They were part saws that I picked up with no cyls or pistons.
SawTroll
Information Collector
What I have the info from is a 1990-01 service bulletin, that state the serial number for the change as 9190006 (= early in week 19 1989), and I know no more about the issue.
It is very odd that they issued a service bulletin on it, if it isn't an issue - maybe the aftermarket cylinder is specially made to fit both the newer and the older case?
What I have the info from is a 1990-01 service bulletin, that state the serial number for the change as 9190006 (= early in week 19 1989), and I know no more about the issue.
It is very odd that they issued a service bulletin on it, if it isn't an issue - maybe the aftermarket cylinder is specially made to fit both the newer and the older case?
Thanks for the info. My serial #7160181 looks like 1987, early in week 16 (if i"m reading that right).
Anytime aftermarket pistons are used, the reliability of aftermarket circlips comes into question. Anyone used the NWP kits before that can comment on their circlips? Any secrets to the orientation of the circlips for most reliability when installing?
MechanicMatt
Cut Split Stack Burn
I wish i knew how to link this thread into the one captain crunch needs to see but hopefully he'll find it now that it is on the first page.:hmm3grin2orange:
Captain Crunch
ArboristSite Operative
Matt,
I a'm here, thanks for the link. Rep sent.
The 50 on my bench is a 45 mm bore, s/n 0311318, black tag. Not sure what year that would be.
The bottom of the cylinder on this one, and a 1999 55 measure 49.96 mm, so pretty close to the service bulletin.
Good info, I will track this as I get ready to pull the trigger on my project. It seems this series of saws is worth the effort even though some look down on anything not a "pro" saw.
I a'm here, thanks for the link. Rep sent.
The 50 on my bench is a 45 mm bore, s/n 0311318, black tag. Not sure what year that would be.
The bottom of the cylinder on this one, and a 1999 55 measure 49.96 mm, so pretty close to the service bulletin.
Good info, I will track this as I get ready to pull the trigger on my project. It seems this series of saws is worth the effort even though some look down on anything not a "pro" saw.
