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My 670 jonsered champ conversion restoration to a west coast

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I have a jonsered 670 Champ thats been in the family for a while. Recently its a backup saw. But I decided to look on the forum here and talk to some ppl, I'm swapping cylinder, piston, carb off of a husqvarna 272xp and also doing the west cost intake with air filter. No base gasket for more compression, muffler mod, SOB should really scream. 66.7cc stock, 4.9hp stock. stock piston is 50mm. Will be running the 272xp cylinder and piston which is 52mm bore. So will be 52mm after, 70.7cc and around 5.9 hp when I'm done maybe a little more. Here are before pics and pics of the parts I just ordered. Once I get the parts and start building I will post building pics and after pics. Hope you enjoy. I'm going to run a 24" bar on this one. Let me know your opinions and thoughts.
 

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Kozak Logging

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Here's the new parts pics
 

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Kozak Logging

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new parts pic
 

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Kozak Logging

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I like the build. Actually it'll be 72.2cc. Ought to run out good
Tell me how you got thay answer. Of you have to.. do the math right here in a post. I need to know as well as others. I came close atleast lol. Whats your guys guess on hp you guys?
 

huskihl

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Cc = area of bore x stroke
Area of bore is pi (3.14) x radius (26mm) x radius (26mm)
= 2122.64 Sq mm
34 stroke x 2122.64 = 72,170 cubic mm. ÷10 (3 times because it's cubed, so ÷ 1000) = 72.17 cc
 

huskihl

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Is that cylinder gonna fit under that cover?
Yes, it'll fit if the spark plug angle is the same as the original 670 jug. I think the kit he bought had this conversion in mind
 

Kozak Logging

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I hope it fits lol. I'm pretty sure it will. I got it from a guy who knows his stuff. If it doesn't I will make ot fit :)
 

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OTE="Motorhead, post: 25023, member: 215"]Looks like an Oem 272 top end[/QUOTE]
Yes it is. With decompression too. I just may use it on this one.
 

huskihl

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OTE="Motorhead, post: 25023, member: 215"]Looks like an Oem 272 top end
Yes it is. With decompression too. I just may use it on this one.[/QUOTE]
I didn't see the pic of the used cylinder. I thought you got the one that was a conversion. The plug might hit the air filter cover...might not...not sure of the rhyme or reason. Use new oem gaskets on each side of the plastic intake block. Those AM gaskets are prone to failure
 

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QUOTE="huskihl, post: 25047, member: 360"]Yes it is. With decompression too. I just may use it on this one.[/QUOTE]
I didn't see the pic of the used cylinder. I thought you got the one that was a conversion. The plug might hit the air filter cover...might not...not sure of the rhyme or reason. Use new oem gaskets on each side of the plastic intake block. Those AM gaskets are prone to failure[/QUOTE]
Im not using a base gasket. The plug is covered by the air filter cover and I'm doing the west coast setup so I won't be using the stock air filter cover anyways :) so I think and hope I will be ok
 

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Cylinder cover will fit fine either way. And going west coast eliminates the problem. IF you replace the intake gaskets, those are the ones you wanna make sure are oem.
 

Kozak Logging

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Cylinder cover will fit fine either way. And going west coast eliminates the problem. IF you replace the intake gaskets, those are the ones you wanna make sure are oem.

Yes sir, Bryan is sending me all new OEM gaskets. I'm not using anything aftermarket here. Doing it all right. Having custom stickers for the sides. It will say,, "670 Champ MOFO" you can figure it out lol. Gonna be a badass saw hopefully.
 

huskihl

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I have a jonsered 670 Champ thats been in the family for a while. Recently its a backup saw. But I decided to look on the forum here and talk to some ppl, I'm swapping cylinder, piston, carb off of a husqvarna 272xp and also doing the west cost intake with air filter. No base gasket for more compression, muffler mod, SOB should really scream. 66.7cc stock, 4.9hp stock. stock piston is 50mm. Will be running the 272xp cylinder and piston which is 52mm bore. So will be 52mm after, 70.7cc and around 5.9 hp when I'm done maybe a little more. Here are before pics and pics of the parts I just ordered. Once I get the parts and start building I will post building pics and after pics. Hope you enjoy. I'm going to run a 24" bar on this one. Let me know your opinions and thoughts.
Mine looked about like that before I started. Blow gun and a parts washer and they'll shine right up
20160104_164722.jpg
 
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