ZRT 600 Hesitation cont'd..

ZRT 600 Hesitation cont'd..

Post by James D. Sco » Fri, 22 Dec 1995 04:00:00


Anyone ever test putting in a bigger Pilot Jet (say, for
example....40). I'm curious if the machine isn't getting enough juice
at low end until the main jets kick in (thereby giving us great power
after higher RPM's. I was going to give it a shot hoping to have the
best of both worlds - no hesitation and a not so abrupt engagement (eg
5000 + by putting in stiffer springs or Cat's 51.5 weights) . Even if
you haven't tried this, any comments much appreciated.  Thanks
 
 
 

ZRT 600 Hesitation cont'd..

Post by Chuck Ri » Sat, 23 Dec 1995 04:00:00


: Anyone ever test putting in a bigger Pilot Jet (say, for
: example....40). I'm curious if the machine isn't getting enough juice
: at low end until the main jets kick in (thereby giving us great power
: after higher RPM's. I was going to give it a shot hoping to have the
: best of both worlds - no hesitation and a not so abrupt engagement (eg
: 5000 + by putting in stiffer springs or Cat's 51.5 weights) . Even if
: you haven't tried this, any comments much appreciated.  Thanks

You may be able to test your theory by turning the air***adjustment
way in. I have seen many sleds that needed bigger pilot jets to stop a
low end bog.

 
 
 

ZRT 600 Hesitation cont'd..

Post by Doug Ritt » Sat, 23 Dec 1995 04:00:00


: Anyone ever test putting in a bigger Pilot Jet (say, for
: example....40). I'm curious if the machine isn't getting enough juice
: at low end until the main jets kick in (thereby giving us great power
: after higher RPM's. I was going to give it a shot hoping to have the
: best of both worlds - no hesitation and a not so abrupt engagement (eg
: 5000 + by putting in stiffer springs or Cat's 51.5 weights) . Even if
: you haven't tried this, any comments much appreciated.  Thanks

I still haven't figured this one out completely - is it a *true* hesitation
or just that the power doesn't really come on hard until 5000 RPMs?????

I have tested my ZRT with the stock setup and didn't notice a "bog" of any
sort or even what I would call a hesitation - the engine revs from idle
to 4000 to 5100 steadily and the sled comes off the line from a standing
start smoothly.  It certainly does not stretch your arms, but the response
is instantaneous and it is smooth.

Once you hit 5100 RPMS the power comes on hard and when you hit 6000, you'd
better have a good grip on the bars.

So I'll ask again: is the problem *really* hesitation or is it just the
big difference between the power at 4000 and the power at 6000 that makes it
seem like hesitation?

BTW, I got my weights back from Dakota Performance yesterday.  I did not get
the new spring, but I'm going to call around and see if I can get one locally.
If I can, I'll get the sled back together this weekend and we have enough
snow to do a little testing behind the house.  I'll let you all know how
well the Dakota mods work sometime this weekend . . . maybe.

--
Doug Ritter


 
 
 

ZRT 600 Hesitation cont'd..

Post by Doug Ritt » Sat, 23 Dec 1995 04:00:00

: BTW, I got my weights back from Dakota Performance yesterday.  I did not get
: the new spring, but I'm going to call around and see if I can get one locally.
: If I can, I'll get the sled back together this weekend and we have enough
: snow to do a little testing behind the house.  I'll let you all know how
: well the Dakota mods work sometime this weekend . . . maybe.

Imagine my embarasment - no new spring needed, just the removal of one shim
from the drive clutch.

I will not be able to get the shim out until I can get to a Cat dealer, since
my dealer doesn't even have a puller for the new clutches, let alone a spider
tool.  Report will therefore be delayed indefinitely - not sure when my first
ride will be, maybe Feb.

--
Doug Ritter

 
 
 

ZRT 600 Hesitation cont'd..

Post by Doug Ritt » Sun, 24 Dec 1995 04:00:00

: I will not be able to get the shim out until I can get to a Cat dealer, since
: my dealer doesn't even have a puller for the new clutches, let alone a spider
: tool.  Report will therefore be delayed indefinitely - not sure when my first
: ride will be, maybe Feb.

Geeze, this guy needs to get out of the office more often. <g>

OK, it's now Saturday afternoon, I've been away from work for nearly 16
hours and my head is a little clearer.  Next time someone hears me say
that I want to work on a major software project, slap me up side of the
head *quick*.

I was able to spend the morning working on the zirt, put the clutch
back together, sync'd the carbs as well as I could by ear, sealed up
the leaky weld in the silencer, gassed it up and took it out in the
field behind the house for some testing.

Now, like I said, Dakota recommends removing one shim from behind the
spider, but without a spider tool I could not do that.  But even
without doing that, the reground weights made a big difference.  The
engagement speed is still right around 4000, but from there, the
power comes on *real* quick now.  It's still smooth, but you hit the
"magic 5100" almost instantly.  There's certainly no hesitation with
this setup and there's isn't much of what I'd even call a "flat spot".
But it's still a nice, smooth, controlled take-off.

I like it a lot and am glad I had it done.  I'll make some calls
this week and see if I can get a spider tool for the new clutch
and get that shim out and see how it goes.  It cost me less than $40
to have the weights ground, including shipping - nice mod, well
worth the money.  Thanks for the recommendation Kevin.

I'm done with that now and am about to "wax poetic" - hit 'n' now
if you don't like that kind of stuff.

It's been almost a year since I've been on a sled.  It's been 3 years
since I had a winter where I rode a lot.  And in that time, I've spent
a considerable amount of time wondering if maybe this is not the sport
for me, since I'm so far away from everything having to do with sledding.
I've asked myself if it's really worth all the money, the time away
from work and my family, driving hundreds of miles through ice and
snow.  I've wondered if maybe I shouldn't just sell the sleds and
get a decent used dual-sport bike and ride the trails in southeast
Ohio.  I could do that for 8 or 9 months out of the year and can get
to them in only a couple of hours.

But *every* time I get on a sled, *all* of those thoughts vanish
in a heartbeat.  Today I rode about 15 miles total, around and
around in a soybean field and around the yard . . . and even after
20 years of riding I can *still* say that it is the single most
enjoyable activity I have ever engaged in standing up.  (stop me
quick before I break out into song! ;)

I love snowmobiling, plain and simple.  My new zirt is a heck of sled,
but it honestly doesn't matter to me what kind of sled I'm on, I love
to ride snowmobiles.  If I had blown up the zirt trying to get the
jetting right (I *didn't*, thank you very much - hey Dan, when can
I expect my egt gauge???) and had to ride my '90 Indy the rest of
season, I would have had just as much fun.  You guys go ahead and
argue about which brand is best or go out on the lake and see who
has the best performance mod shop, I'm goin' riding!

;-)

Now where did I leave that monkey wrench?  I need to whack my
boss a couple of times to convince him I need some time off.

--
Doug Ritter

 
 
 

ZRT 600 Hesitation cont'd..

Post by Scott Will » Sun, 24 Dec 1995 04:00:00

Quote:

>Imagine my embarasment - no new spring needed, just the removal of one shim
>from the drive clutch.

        Yes, I talked to Reichard's Performance and Jeff is going to send me
some of their special shims. He said to remove the three stock ones
and install one of their special sized ones.  New clutching info for
me, I'm still learning, I guess.

Quote:
>I will not be able to get the shim out until I can get to a Cat dealer, since
>my dealer doesn't even have a puller for the new clutches, let alone a spider
>tool.  Report will therefore be delayed indefinitely - not sure when my first
>ride will be, maybe Feb.
>--
>Doug Ritter


        First ride in February????????   Cat dealer doesn't even have a new
style puller or a spider tool???    Wow, and you even live in the so
called "snow belt".     Things that make you go hmmmmmmm.


2 each '96 ZRT600 Mountain Cats
Northern Utah
(OK, OK, one Zirt is the Wife's)

 
 
 

ZRT 600 Hesitation cont'd..

Post by Scott Will » Sun, 24 Dec 1995 04:00:00


Quote:
>Anyone ever test putting in a bigger Pilot Jet (say, for
>example....40). I'm curious if the machine isn't getting enough juice
>at low end until the main jets kick in (thereby giving us great power
>after higher RPM's. I was going to give it a shot hoping to have the
>best of both worlds - no hesitation and a not so abrupt engagement (eg
>5000 + by putting in stiffer springs or Cat's 51.5 weights) . Even if
>you haven't tried this, any comments much appreciated.  Thanks

        Yea, please report back. Sounds like a good idea.


2 each '96 ZRT600 Mountain Cats
Northern Utah
(OK, OK, one Zirt is the Wife's)