Author Topic: Jonsered 670 Champ  (Read 2998 times)

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Offline man of stihl

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Re: Jonsered 670 Champ
« Reply #10 on: February 05, 2012, 04:05:29 pm »
I guess I'll be spliting the case and buying a used crank\rod.
Ron

Offline 660magnum

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Re: Jonsered 670 Champ
« Reply #11 on: February 05, 2012, 04:22:08 pm »
Too bad we cannot take the crank apart and install a new bearing in the bottom of the rod.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline man of stihl

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Re: Jonsered 670 Champ
« Reply #12 on: February 05, 2012, 04:48:55 pm »
Too bad we cannot take the crank apart and install a new bearing in the bottom of the rod.
Yeah. I agree. I thought of just buying another crankcase also but I'll just replace the crank. This saw is just to nice to part out or have doner saw parts added to it. I'll make some kind of case seperator here in the near future. I have a Dolmar 7900 on the bench too that is top priority at the moment. ;)
Ron

Offline HolmenTree

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Re: Jonsered 670 Champ
« Reply #13 on: February 05, 2012, 10:48:04 pm »
I remember when the 670 first came out in the late 1980s when I was logging. I can't remember exactly but the very first  ones had a lighter bottom end or tighter volume crankcase or something and put out real good power compared to the newer models.
One of the Frenchmens ran over one of these first series 670s with his skidder, good thing there was enough muskeg in the ground to prevent the saw from getting totalily crushed. The saw only had about 20 tanks of fuel through it and the only damage was a broken fuel tank, handles, top cover. I bought it for $100.
I ground 4 finger ports into its cylinder, took 60 thou off the bottom of the piston's intake skirt, polished up the exhaust port, gutted the muffler, enlarged the carbs venturi and milled 25 thou off the cylinder base. I sold it to my older brother for $250 as is. My brother won alot of races with that 670 after he fixed it up with new tank etc. In the 10"X10" 3 cuts [1 down 1 up 1down] he was beating the 064s and then the new 066s in the 80cc and over class. Very very strong saw and probably the best saw mod I ever did.
And I kick my ass I didn't keep it for myself. >:(
Making a living with a saw since age 16.

Offline CASE5854x4

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Re: Jonsered 670 Champ
« Reply #14 on: February 06, 2012, 10:24:08 am »
4 finger ports.............. very interesting ! What configuration/location were they ?

Steve

Offline HolmenTree

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Re: Jonsered 670 Champ
« Reply #15 on: February 06, 2012, 02:34:51 pm »
4 finger ports.............. very interesting ! What configuration/location were they ?

Steve
2 on each side of cylinder bore, each starting from top corner of bottom transfer going up alongside top transfer port ending at the roof level of that port.
Nothing very interesting really......... modders have been doing this since the 1960s if not earlier.
Making a living with a saw since age 16.

 

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