Installing a 670 Rotax in an Indy Wedge Chassis.....

[Rob Pilgrim]

OK,

I have a project that I've wanted to do for a long, long time and I'm
about to start gearing up to do it.

I'm going to begin hoarding parts and information starting today to
build an ultra light snowmobile based on the Indy wedge Chassis
(probably a '93-94 XLT or Indy 500 or 440) with a 670 Rotax. I figure
the snowmobile will be purchased this year, preferably with a 136"
track and with the old motor either shot or - even better - removed.
That shouldn't be too hard to find. If I can only find a short track,
I'll probably fab a custom tunnel and go ahead with a light drop and
roll chaincase if I go that route. I now have the shop and the
resources, so now's the time to do it. The year of the sled doesn't
matter too much, since the only major changes in the wedge cahssis
after 90 was the rear skid, which I will be replacing with a stretched
Expert X. So.....if I could find something without a rear skid and
with the motor blown, I could save myself mucho dineros.

Anyways, the search starts today for the machine and for advice. Has
anybody here ever done the swap or have any info on it or a similar
swap? I know there were a ton of mountain guys doing this switch
before Polaris intro'd the 700 twin and I'm sure there is a lot of
info available.

If you have info regarding:

1 - drop and roll Polaris chaincase
2 - clutching combo
3 - gearing ratio
4 - tunnel angle for powder
5 - motor mount plate compatibility
6 - pipe routing

I'll be gathering lots of information personally as well, but if you
have anything to add right now, shoot it my way.

Any info would be appreciated.

Thanks,

-Rob

[darrell drew]

Check the back issues of snowtech, I seem to recall seeing an article or
two on this. There also was a company selling a swap kit that had motor
plates, and various bits and pieces. I don.t remember the name right now
but I'll send it when my feeble brain coughs it up. The only thing I
strongly suggest is to get a post 93 chassis or use a post 93 chaincase
and jackshaft setup. The pre 93 chaincase and jackshaft polaris stuff was
shit and constantly breaking or wearing out. From 93 on they went to a
splined jackshaft on the chaincase end and a way better chaincase and
cover design. Also don't even think about using reverse which you
probably arnt if you're going for a lightweight. Polaris's reverse was
and is shit and won't tolerate any abusive riding. Of the ones I've seen
( conversions) the best setup was using polaris primary and secondary
clutches, you can buy polaris primaries already machined to fit on a 670
crank brand new for the same as a regular new p85 and the secondary will
of course bolt right on the polaris jackshaft and tuning will be easier
than using skidoo clutching. I have also long wanted to do one of these
projects, one of these days maybe.

[Ron Holm]

Precision Products (208-522-0480) in Idaho Falls Idaho Make kits
to do this conversion. They have a web page but I cant think of the
address right now

Ron Holm
97 Summit 670 xtc
rh...@srv.net
http://www.srv.net/~rholm

[Rob Pilgrim]

Ron,

Are you sure that's not supposed to be Precision-Performance?

NEXT Q:
======

Can I fit '95 Mach 1 stock twin pipes under an Indy Wedge chassis
hood? I'm thinking maybe, but I know I couldn't pull it off in an
S-2000 chassis! That's my other donor option.

-Rob

Ron Holm <rh...@srv.net> wrote in message news:<vtamvts7k7gvqg1l4...@4ax.com>...

[Don M]

The motor and pipe to get would be the last year of the 670, which was the
HO version.

Doug Ritter, who I don't think has been reading this group this season, put
a 583 into a 1990 or so Indy 500 chassis. It is still running in the hands
of another owner who also posts here occasionally. Doug did a good job with
it. He sold it because he felt the front end was too inferior to the long
travel of today's sleds. He had put the 40" or 41" Poo kit on it.

He also had put an Xtra-10 skid into it and he wrote up a series of articles
for Snowmobile Online, which is at www.off-road.com/snowmobile.

I am not sure if the articles were for the skid work or the whole deal. I
think it was for the whole deal. I do remember he rolled the case. You can
probably email Doug at do...@infinet.com with questions. Be nice. :-)

-Don M

Rob Pilgrim <robpi...@adboivin.com> wrote in message
news:f69299b8.01112...@posting.google.com...

[Don M]

Actually, here is the URL:

http://www.off-road.com/snowmobile/project/indy/engine.html

Don M <dmcl...@earthlink.net> wrote in message
news:%KXK7.1584$eT3.1...@newsread1.prod.itd.earthlink.net...

[Snowjacks]

Doug Ritter did a GREAT job, and the 583 Rotaris is still running strong.
I've installed a Polaris EZ throttle, upgraded the front end with some
aluminum KYB's last year (SRX takeoffs), and I'm going to try some Ohlins
this year. The KYB's were a noticeable improvement, and hopefully the
Ohlins will be even better. The sum total of repairs over the last three
seasons has been one driveshaft bearing and a new hand warmer, otherwise the
Rotaris has been bulletproof. It still looks great, and has no trouble
running with the 1999-2001 machines.

"Don M" <dmcl...@earthlink.net> wrote in message
news:%KXK7.1584$eT3.1...@newsread1.prod.itd.earthlink.net...