Comet Clutch on ROTAX 670

[snowd...@my-dejanews.com]

Has anyone tried a Comet 108 EXP on a 670 Summit? I just installed one and
started with purple spring and 54 gram weights. Any one else know a good set
up for 4000-6000ft and 10,000 to 14,000 feet? Thanks for the help in advance.
John 96 Summits 500 & 670, 85 Phazer PSI pipe,porting, reeds, Comet 102C
clutch. P.S. Please don't flame me on pulling off the TRA, it'll be in my
tool box in the truck with the puller, I got the 108 EXP brand new for $75
and put $35 worth of wieghts and spring in it, worth trying to me.

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[Stuart Lawrence]

I'm curious, can you buy the Comet with the correct taper for the Rotax?
Or do you have to get it machined? Is the 108 EXP the same as a Polaris
primary off of XC/RMK 700?

--
Mountain Doo
98 Summit X
97 Summit 583

snowd...@my-dejanews.com wrote in message
<7356th$oh6$1...@nnrp1.dejanews.com>...

[MECHZER]

no the 108exp would not wastetime that get regular 700 polaris clutch I am
doing that right now and hopoing solve alot of problems
mach z 800

[snowd...@my-dejanews.com]

Moutain Doo: Yes you can get a comet in the taper for the Mach Z and 670
Motors. Now you got me wondering if I can use the Polaris Spring and Weights
in the 108 and set it up exactly like a 700 RMK. I should be able to use the
spring and get comet weights the same weight as the P0laris. Going to try it
out the first ride this coming Saturday, Lookout Pass, Id/Mt border.
Snowdoo500

In article <736o3p$2v...@dragon.sk.sympatico.ca>,

[HiJaak7907]

>a comet in the taper for the Mach Z and 670

Not a good idea. Harmonic ballance of the crankshaft changes. A very strong
chance to loose crank bearings. One of reasons the Cush drive clutch came
along

[snowd...@my-dejanews.com]

In article <19981201060517...@ng21.aol.com>,

OK Why then has everyone around here including Kinetic and a skidoo waranty
performance shop been putting modified Polaris 700 RMK clutches on 670's all
last season? At the grass drags a POLTAX with polaris primary and secondary
took the whole shooting match in the 'weekend warrior' class and has been
running Polaris clutches for 3 seasons on that machine. Also the Mach1 670's
held up without cushion drive, I heard the cushion drive was more to save the
clutch than the crank. John, 96 Summit's 670 & 500, 85 Phazer, previous sleds
82 TXL Indy,95 Summit 583.

[snowd...@my-dejanews.com]

In article <742k61$t5p$1...@nnrp1.dejanews.com>,

snowd...@my-dejanews.com wrote:
> In article <19981201060517...@ng21.aol.com>,
> hijaa...@aol.com (HiJaak7907) wrote:
> > >a comet in the taper for the Mach Z and 670
> > Not a good idea. Harmonic ballance of the crankshaft changes. A very
strong
> > chance to loose crank bearings. One of reasons the Cush drive clutch came
> > along
> >
> >
>

OK OK OK MY APOLOGIES TO THE NEWSGROUP. Yes the newer 670's do need a
balancer when installing a none cushion drive TRA clutch on them. I think it
started with the S-chassis sleds. You are at risk of taking out the mag side
bearings and or crank until you do it. I was informed on my first ride of the
season by the son of the guy who has the ROTAX performance shop I normally go
to while we we climbing the big bowl above Elsie lake Idaho this weekend in
about 5' of new snow,(last week). Nice thing to think about while your riding
in a remote area. Talked to the COMET dealer who sold me the clutch and he
knew about it but I didn't tell him which year my Summit 670 was so he didn't
tell me about the blancer. I guess I get to ride the 500 Summit until the
blancer comes in or put the tra back on. Funny thing though is I called
KINETIC this morning and they didn't know anything about the balancer, so a
word of warning if you put a non cushion drive tra clutch on a 96 or newer
670 order the mag end balancer from Ski-doo or risk a bearing and /or crank
failure. John, Washington the state. 96 Summits 670 & 500, 85 Phazer piped,
ported & clutched.