Help me identify this modded 670 engine ,

I

id_novacaine

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Dec 28, 2007

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THE GARDEN IN EDEN

• Feb 3, 2011

• #1

I picked up this 97 summit last year with a burnt hole for 400 bones .
and I started to check out the engine to see what i needed to fix .
It has some nice port work block and cyl.

but the sleaves stick up further than the cyl. ( i have never seen this before !)

The union bay domes are shaved for for the taller sleaves. It had the single pipe and a alum can.


I talked to the previous owner and he didnt have any info other than IT FREAKIN RIPS !!
Sled came out of idaho falls area.
I got some pics of it if need be ...

THANKS FOR PASSING ON SOME INFO.

I put my twin piped 583 U.B. headed one in for now , but I would reall love to run the modded mill.


LATER ,
J

 

Last edited: Feb 3, 2011

I

id_novacaine

Free Member

Dec 28, 2007

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THE GARDEN IN EDEN

• Feb 3, 2011

• #2

found some info on cyl.

it has 80.8? mm pistons and on the cylinders there is some markings ,

any info would be great

 

winter brew

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LakeTapps, Wa.

• Feb 3, 2011

• #3

Standard bore is 78...either overbore or a 740??? UBR did some very nice running 740's....does it have the shorty intake/RV cover?

 

I

id_novacaine

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Dec 28, 2007

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THE GARDEN IN EDEN

• Feb 3, 2011

• #4

Short intake ? I have three 670`s and 2 583`s and they all appear to have the same length cover.

is there a number on the shorter one or a measurement i could take to tell ?

thanks man

 

I

id_novacaine

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Dec 28, 2007

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THE GARDEN IN EDEN

• Mar 30, 2011

• #5

REALLY nobody knows ?

is this the big bore for the 670 that uses polaris 700 ves pistons ?


Help
''thanks to all

 

C

cog

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Dec 7, 2007

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8

• Mar 31, 2011

• #6

Post some pics especially the cases.

 

I

id_novacaine

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Dec 28, 2007

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THE GARDEN IN EDEN

• Mar 31, 2011

• #7

here is a couple

I called fastrack and they dont have any info on numbers

 

BIG JOHN

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Minnesoooota

• Apr 1, 2011

• #8

thats a Union Bay motor...if its only a 80.5mm piston its a 700 cc motor...would need to see piston to verify...but the kawaski 750 watercraft uses a 80 mm that works in ski-doo...the next step up was the 700 polaris piston 81 mm for a 720 and then a 740 was a 82 mm piston from 780 sea-doo...BJ

 

I

id_novacaine

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Dec 28, 2007

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THE GARDEN IN EDEN

• Apr 7, 2011

• #9

thanks man,

the top of the piston has 80.86 , I think

 

Reeb

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Twin Rivers

www.robinsms.com

• Apr 29, 2011

• #10

Looks exactly like the one I got. 720cc with jaws twins and lookout! Almost thought about putting it in my Rev to replace the cranky 800.

 

I

id_novacaine

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THE GARDEN IN EDEN

• Apr 29, 2011

• #11

thats by union bay right ? polaris 700 v.e.s. pistons ?

 

Reeb

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Twin Rivers

www.robinsms.com

• Apr 30, 2011

• #12

Yup UBR built her. Original owner said it dynoed quite high.....so high I don't wanna say cause I think it's a bit of BS, but he said it was dynoed at the old UBR before it was put into his race sled. At any rate it was the fastest 700 I've seen to date.

 

I

id_novacaine

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THE GARDEN IN EDEN

• May 2, 2011

• #13

thanks man...

I have a set of fast twins for it , and 40 mm carbs .
should i bore my carbs ?

 

Reeb

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Twin Rivers

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• May 3, 2011

• #14

40 Rounds? I'd do it.
I'm running Jaws twins an and 44mm roundslides. Pods, and TRA primary with a Cat Secondary. It's all wrapped up in a CR Racing ZX chassis. Will be on the snow again next season at some point.