Author Topic: pioneer 650  (Read 356 times)

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Offline 1manband

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Re: pioneer 650
« Reply #20 on: May 03, 2017, 09:17:41 pm »
after some soap and hot water using a non-scratch pad.

worked on the head ok.  piston and cylinder not really any better.
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Offline 1manband

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Re: pioneer 650
« Reply #21 on: May 03, 2017, 09:26:24 pm »
don't like worrying about flammable solvents catching fire while i am at work.

cylinder will need some honing.

vinegar loosened the stuck rings a little bit after the soak, but not free yet.

vinegar turned the piston pin black.

have piston soaking in a bio friendly citrus cleaner to see how it works.
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Offline 1manband

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Re: pioneer 650
« Reply #22 on: May 04, 2017, 05:45:57 pm »
...getting somewhere with the piston now.
----------------------------------------------------------------

vinegar in gas tank.  soaked for 3 hours.  rinsed it out with water.  then soaked one more hour. rinsed.

inside of tank turned black.

did not dare to soak overnight, do not think i would have a gas tank left.  have to think it is eating the magnesium.
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Offline 1manband

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Re: pioneer 650
« Reply #23 on: May 04, 2017, 07:39:43 pm »
trapped and geometric comp
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Offline 3000 FPS

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Re: pioneer 650
« Reply #24 on: May 04, 2017, 11:00:25 pm »
Love the pics so far.   Interesting saw to say the least.   That magnesium gas tank was sure boiling. 
PP 505, 475, 445.

Offline 1manband

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Re: pioneer 650
« Reply #25 on: May 06, 2017, 04:55:34 pm »
Love the pics so far.   Interesting saw to say the least.   That magnesium gas tank was sure boiling.

cool.  hope i get it spinning.  the gas tank had plenty of grit and corrosion pitting.  not sure the vinegar got it with all that bubbling.
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Offline 1manband

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Re: pioneer 650
« Reply #26 on: May 06, 2017, 05:01:14 pm »
spent some time this afternoon measuring piston and a few more volume checks.

kept measuring until i could duplicate the number consistently.

piston skirt length varies a bit in this piston.

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Offline 1manband

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Re: pioneer 650
« Reply #27 on: May 06, 2017, 05:11:32 pm »
a few more volume checks.

-would be much easier with a graduated cylinder.  have to use what i have.

hard to see in the photo but filled to exh. port roof.

so far one clue is there to show .....why roy says these saws have some guts.

piston 2nd ring groove has closed up a couple thou.  taking care cleaning it in case i need to reuse it.

piston now soaking in straight simple green cleaner.



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Offline HolmenTree

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Re: pioneer 650
« Reply #28 on: May 08, 2017, 11:51:04 am »
1manband, very nice project. I always wanted to restore one of these old girls. Almost had one once like brand new.
Like Roy said the Canadian National Railway used to use them.  I had a tree removal customer about 10 years ago who worked for the railway and he took ownership of one that only ran a tank of fuel through it. The painted letters on the bar weren't even scratched.
Well about 5 years later when I learned the history on these saws I called the fellow up and asked him if he still wanted to sell it. Well he had a sad reply, he said it was collecting dust for too long in his shop so he threw it out in the garbage dump :o

Anyways here's some history on the saw. I even got a copy of a parts manual for it

The 650 was introduced in 1964 and discontinued in 1976. There was also the 750 and 850.
The design of these saws started way back in 1956 with the IEL/Pioneer RA model as my other pics show.

Now check out the very last pic of the Stihl Contra/Lightening introduced in 1959.
Check out the Stihl's design similarities to the 1956-57 Pioneer RA.
Looks to me the Stihl 090 was a IEL/Pioneer imitation.

Making a living with a saw since age 16.
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Offline 1manband

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Re: pioneer 650
« Reply #29 on: May 09, 2017, 05:59:40 pm »
enjoy reading your posts holmen, i always get a quite a history lesson.

appreciate posting the parts list to boot!

123cc 800... just wow.

at the bottom of the parts list, reads that a crank modification was made in later models.  wonder if the late models had a 1 piece crank?...or something else?  mine looks to have an earlier serial number before the change.

similarities indeed to the 090.  competition between manufacturers back then must have brought out the big guns, or was that just what the loggers needed at the time for big timber?
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