Author Topic: Husqvarna 50  (Read 5640 times)

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Offline Cut4fun .

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Re: Husqvarna 50
« Reply #100 on: April 27, 2020, 05:20:52 pm »
Thats a nice one . Take care of the recoil decal for the collector types. 
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Offline Spike60

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Re: Husqvarna 50
« Reply #101 on: April 30, 2020, 07:21:40 am »
The early and pre-special 50's were actually 44mm. Both white and gray tops. When the 50 became the 50 Special there was a crankcase change to accept the 45 and 46 mm top ends. There is a service bulletin on this that I can check later for actual dates. The switch from the white to gray top cover preceded the case change so there are gray top saws with the early case out there. The early cases won't accept the 45 or 46 mm top ends. The hole in the case just isn't big enough. (they will accept closed port Jonny 490 top ends if you have one laying around) 
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Offline 3000 FPS

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Re: Husqvarna 50
« Reply #102 on: April 30, 2020, 11:11:21 am »
Ok Thanks Spike.
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Offline Spike60

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Re: Husqvarna 50
« Reply #103 on: April 30, 2020, 12:01:24 pm »
Serial number break is 9190006 for the case change. Week 19; 1989. You never know with old saws that have had parts swapped over the years and the decals send you off in the wrong direction. Bet we've all been fooled that way at one time or another.

If you end up with a case with no ID plate, the SB gives us some measurements for the inner diameter of the case.

Early: 48.5mm
Later: 50.5mm

Outer diameter of the cylinder base:

44mm jugs: 47.9mm
45/46mm jugs: 49.7mm

Husqvarna-Jonsered

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Offline Cut4fun .

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Re: Husqvarna 50
« Reply #104 on: April 30, 2020, 06:04:13 pm »
Thanks spike. 

I think I got that SB link in thread.

See if I still have it on HD.  Found pic. 



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Offline 3000 FPS

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Re: Husqvarna 50
« Reply #105 on: May 05, 2020, 11:37:44 am »
I found a cylinder made for the Husqvarna 50, 51 with a 45mm bore.   I checked it last night and it is a proper fit.   So a little modifying to the cylinder and then will start to put it together.    I also have new crank seals and will replace them too.    The intake area looked ok and the impulse looked ok.   But it sure was run lean and was scored pretty bad.    Maybe it got straight gassed.   
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Offline 3000 FPS

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Re: Husqvarna 50
« Reply #106 on: May 06, 2020, 07:16:44 pm »
So I got the Husky 50 special together today and started it.   Runs good.   I put it together without a base gasket which means I had to relocate the impulse hole in the cylinder.   I think the impulse works better now than when stock.    I did find a used OEM cylinder on ebay for a Husky 51 45mm for pretty cheap and bought it.  The OEM does not have a decompression valve and the one I have on there now does.   I will modify the impulse the same way now that I know it works so good.   I think I will also widen the ports to pep this up some.    I have had this saw for 4 years just sitting in the garage and I did not even have to touch the carb to make it run.   So far I like it and will be even better with the OEM cylinder.   
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Offline 3000 FPS

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Re: Husqvarna 50
« Reply #107 on: May 13, 2020, 03:37:37 pm »
The OEM cylinder that was advertised for a Husky 51 and 45mm turned out to be the exact same cylinder that was on the 50 special. 
The porting is a lot nicer on the OEM and the transfer ports are a lot better looking.    So I put it on today.   Once the Yamabond dries good I will fire it up tomorrow.   I think the saw will run better with the OEM cylinder on it.   
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Offline 3000 FPS

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Re: Husqvarna 50
« Reply #108 on: May 15, 2020, 04:42:41 pm »
So I have been using the Husky 50 special some and it tuned right where I want it.   I put a tach on it and got 10,500 out of it with the bar and chain.

I also took a picture of the writing on the cylinder because it is exactly the same as the Husky 51 I bought.   

I was looking at the old cylinder and I think I am going to try and clean it up some and might still be good enough to use.   
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Offline Cut4fun .

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Re: Husqvarna 50
« Reply #109 on: May 15, 2020, 05:05:04 pm »
Looking at the spec sheet in the stickys here. 12,500 is max stock out of cut
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