670 Top End Kit

[WyoUltra]

Do you guys have any recommendations for a complete kit (gaskets included) for a 1997?

 

[summit800]

Winderosa gaskets r good , go to Hi-performance engineering .com they'll have everything u need

 

[WyoUltra]

I understand there is a difference between the H.O. and the standard 670, I believe mines just the standard. How do I change mine over to the H.O. or should I just keep it standard?

 

[summit800]

what year is yours?

 

[summit800]

anything after the 96 yr model were ho's

 

[WyoUltra]

Its a 1997, sweet, thanks.

 

[sledsrock]

anything after the 96 yr model were ho's

No, the 97 summit was the std 670, 98 summit was the first year for the HO.

 

[WyoUltra]

What's the difference between the two?

 

[skidoome]

Pistons, combstion chamber, tunnel porting and dpm. I have a spare non ho 670 sitting on my bench if interested. $800 complete with polaris primary clutch. This engine has short intake and porting and fresh rebuilt from crank up.

 

[WyoUltra]

Thanks, but at this point a rebuilds cheaper...

 

[summit800]

Parts r all the same on them, throw in a 301 rotory valve, set of jaws twins , and sume ufo's and let here rip, My 96 was a very good runner

 

[WyoUltra]

301 rotary valve?

 

[summit800]

ya its a aftermarket rotory plate if i remember right it you could get them in steel or composite, changes your air fuel timing

 

[summit800]

you might want to get ahold of the owner from fast trax in puyallup wa. he bought out union bay racing and they were very big into the 670 they had full billet race motors!!!

 

[summit800]

I have a buddy thats giving me his 97 670x , I'm going to give it a little loving , just because it will be fun to do, the only bad thing with twin pipes they r loud!!

 

[sledsrock]

670 vs. 670x

Not all parts are the same between the two, can't just go mixing and matching anything and everything. Again the 670X or H.O. was a 98 release in the summit and a 99 release in the shortie.

 

[summit800]

all the gaskets, plate, and crank seals r the same , only thing different was the porting and head

 

[skidoome]

Good luck with that... As stated earlier 98 was the first year for the x. 99 was the last. Head, pistons were different. The rotary valve part number you gave was also wrong. Its a 501.

 

[summit800]

wow,good 4 u

 

[WyoUltra]

Does the 501 Rotary plate replace what looks to be the purple aluminum thing on the back of the motor?