[4mula-dlx]

Not gettin much action in the Doo forum

Hey guys...

I'm looking to get a little more power out of my buddies 98 Formula 670, and nothing to major, but just wondering if anyone out there has done some jetting and spring changes to get some power out of these motors.

We want to keep the mods cheap, so just some clutch springs and little bit of carb work....so if any of you out there have done things and have the #'s or colours to use let me know..

Thanks in Advance...

 

[bent-it]

I have installed U.F.O's into a few snowmobiles and have gotten increased throttle response as well as bottom end through mid range power.Ive put them into my 440 xcr sp and WOW as well as cheap approximently 90 dollars .Let me know in pm or email [email protected]ks
Dana

 

[4mula-dlx]

Originally posted by bent-it@Sep 18 2005, 05:19 PM
I have installed U.F.O's into a few snowmobiles and have gotten increased throttle response as well as bottom end through mid range power.Ive put them into my 440 xcr sp and WOW as well as cheap approximently 90 dollars .Let me know in pm or email [email protected]ks
Dana
<div align="right">index.php?act=findpost&pid=880666

[/quote]


U.F.O's...sorry never quite heard of that before..want to explain some more to me?

 

[Xc Special]

http://www.royaldistributing.com/servlet/M...age=index1.html

look under "U" in the index

 

[4mula-dlx]

Originally posted by Xc Special@Sep 18 2005, 09:06 PM
http://www.royaldistributing.com/servlet/M...age=index1.html

look under "U" in the index
<div align="right">index.php?act=findpost&pid=881097

[/quote]


not quite what i was looking for but not a bad idea..kinda like the tornado for a car. I'm meaning more down jetting and clutching though.

 

[11c]

Try DOO-TALK, you'll get alot more usefull info from that site.
I'd say for starters find out what the 670 HO had, they made close to 10 HP more than the standard 670.
I know they had a different ROTARY valve (cheap mod) and more compression....maybe more timing ??