ZR 900 too slow - Snowmobile Forum: Your #1 Snowmobile Forum
http://www.snowmobileforum.com
Go Back   Snowmobile Forum: Your #1 Snowmobile Forum > Specific Snowmobile Forums > Arctic Cat Snowmobiles


» Sponsors





Reply
 
LinkBack Thread Tools Display Modes
Old 02-02-2011, 09:28 PM   #1 (permalink)
LedheadELH
 
Join Date: Oct 2006
Location: Maine
Posts: 27
ZR 900 too slow

I have an '03 ZR 900. it goes real well, but I'm always looking for more. It has VF3's, D&D power breather, gutted airbox, 2 degree adv timing key, D&D clutch kit, SLP Single pipe & Can, and like .060-.080" taken off the heads so compression is up some, 1 3/8" track, LOTS of studs.

I want to go faster, any suggestions?
__________________
03 ZR 900
93 ZR 580
LedheadELH is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-02-2011, 09:34 PM   #2 (permalink)
Super Moderator
 
RJ Gleason's Avatar
 
Join Date: Feb 2005
Location: Groton NY
Posts: 32,210
+1 tooth on the top sprocket.
__________________
Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

'90 Wildcat Project in progress.

Vintage (sorta)
1980 Indy Trail 440 (for sale)
1980 AC Pantera (donor engine to the 90 wildcat)


http://www.dcdrifters.net/


Worshipful Master; F&AM Dryden Lodge# 472
http://www.masonicdryden472.org/

Rules of this forum are strictly enforced!
RJ Gleason is offline   Reply With Quote
Old 02-02-2011, 10:16 PM   #3 (permalink)
Registered User
 
DnD800's Avatar
 
Join Date: Sep 2004
Location: NH
Posts: 710
1" track would help out a lot as well or even less of a lug but I feel 1" is the best all around track.
DnD800 is offline   Reply With Quote
Old 02-04-2011, 07:43 AM   #4 (permalink)
LedheadELH
 
Join Date: Oct 2006
Location: Maine
Posts: 27
well I was thinking about gears.....and I can't ditch that track, it works 100 times better than the original. I don't ever get stuck. I will NEVER run a small track again. It might have slightly more drag than a 1", but it's so worth it.

I was thinking about cone air filters, and ditching my box all together. I was also thinking about a set of D&D twin pipes. I don't think these things will make much of a difference though. I know the timing key, and clutch kit didn't. or at least it seems! lol

I was also thinking of porting the jugs??
__________________
03 ZR 900
93 ZR 580
LedheadELH is offline   Reply With Quote
Old 02-04-2011, 08:21 AM   #5 (permalink)
Registered User
 
snownstunt600's Avatar
 
Join Date: Jan 2010
Location: SE Minnesota
Posts: 1,376
Quote:
Originally Posted by LedheadELH View Post
well I was thinking about gears.....and I can't ditch that track, it works 100 times better than the original. I don't ever get stuck. I will NEVER run a small track again. It might have slightly more drag than a 1", but it's so worth it.

I was thinking about cone air filters, and ditching my box all together. I was also thinking about a set of D&D twin pipes. I don't think these things will make much of a difference though. I know the timing key, and clutch kit didn't. or at least it seems! lol

I was also thinking of porting the jugs??
putting on individual air filters will not really be worth the money, when you get rid of the airbox and put on filters the sled is sucking in much more hot air. a lot of people think that they make a lot more power than an airbox but this is not the case, cold air=horsepower, i have seen people who have put on filters and actually had to jet it leaner due to the hot air the motor is getting.. if you are looking for more power out of the 900 go for a set of twins over the single pipe, and or do some porting.
snownstunt600 is offline   Reply With Quote
Old 02-08-2011, 09:16 AM   #6 (permalink)
LedheadELH
 
Join Date: Oct 2006
Location: Maine
Posts: 27
I didn't really think the cone filters would much of a difference either way. Kinda just don't like the stock airbox, it's a pain!

I really am thinking of twin pipes.....they will be loud, and they do give tickets for that around me That has been my only big push for keeping the single pipe. Most likely some D&D pipes I might buy from a friend. any thought positive or negative about D&D here??

Definetly doing some porting this summer tho...
__________________
03 ZR 900
93 ZR 580
LedheadELH is offline   Reply With Quote
Old 02-08-2011, 10:09 AM   #7 (permalink)
Registered User
 
DnD800's Avatar
 
Join Date: Sep 2004
Location: NH
Posts: 710
D&D twins with the quiet can aren't that load, it just has a much deeper tone. I think decibel wise my stock 2000 ZR600 vs 2001 ZR800 with twins were about the same.

My 2001 ZR800 messing around on the lake a few years ago. I don't have any videos posted of my 600 I had but you can find some on youtube.

DnD800 is offline   Reply With Quote
Old 02-08-2011, 11:25 AM   #8 (permalink)
Registered User
 
Join Date: Jan 2011
Location: Calgary AB
Posts: 158
Quote:
I want to go faster, any suggestions?
How much do you weigh....

Highfly is offline   Reply With Quote
Old 02-15-2011, 07:59 AM   #9 (permalink)
LedheadELH
 
Join Date: Oct 2006
Location: Maine
Posts: 27
This quiet can sounds like the way to go for me then, i would love twin pipes!

I had another primary spring kicking around so I tried it out. Engages at only 2,500 now. I did run 3,500 so it's a huge difference. The sled feels completely different. Feels like a standard now, the way it's engaged so low. I have a couple other setups I will try over the next few days, see what I like.

Has anyone ever heard of ditching the power valves? I would assume they are always wide open when you're on the throttle, so why not make them wide open all the time? it would eliminate things under the hood, making it easier to work on. I also wouldn't have to clean them ever again! There must be a reason they are there, but maybe i don't quite understand them completely.

And I only weigh 155, so doubting the problem is there :P

Oh, and +1 tooth on the top? So going from a 26T to a 27T. Making it taller geared.....I was thinking the other way around so I can't have the option of going that fast! lol But I love my truck that's taller geared, with a real healthy big block. If that were low geared it would suck. So I hear the taller gear arguement!
__________________
03 ZR 900
93 ZR 580
LedheadELH is offline   Reply With Quote
Old 02-15-2011, 08:29 AM   #10 (permalink)
Registered User
 
DnD800's Avatar
 
Join Date: Sep 2004
Location: NH
Posts: 710
Some of the racers do this with "block off plates" but on the trail you will lose low end as the valves don't open until in the 6800 rpm range when operating so below 6800 would be kinda flat. You could try 25/38's over the 26/41's although there isn't much of a change in ratio's but it slightly higher but uses a 72P chain.
DnD800 is offline   Reply With Quote
Old 02-15-2011, 08:49 AM   #11 (permalink)
Registered User
 
imfixinmopars's Avatar
 
Join Date: Dec 2010
Posts: 34
turbo
__________________
2000 thundercat ...no twin sounds like that!
2003 zr900 ...freight train-like pull
2001 mountaincat 600 efi
2001 zr440 s/p cross country
2001 zl800 esr
1997 zrt800 piped@wife says "i have a problem."....lol
but i have a soft spot for a '75 rupp 440 F/A... dad had a new one..........and im looking for one.
and yes i love mopars
70 road runner 426 hemi auto 1 fo 30
69 dart 383 gts 4spd
70 cuda 440 4spd
72 charger 440 sixpack!
several others
imfixinmopars is offline   Reply With Quote
Old 02-15-2011, 05:26 PM   #12 (permalink)
Super Moderator
 
kccats's Avatar
 
Join Date: Dec 2006
Location: Northern IL
Posts: 19,521
Just go big bore! 1035 Hooper! With Jaws pipes dynoed at 200HP!
kccats is offline   Reply With Quote
Old 02-15-2011, 06:38 PM   #13 (permalink)
LedheadELH
 
Join Date: Oct 2006
Location: Maine
Posts: 27
I think I can sacrifice the slight low end loss by ditching the power valves. I will try just keeping them held wide open, and driving it to see the difference before I get rid of it all.

I was thinking Big bore....but it wouldn't be THIS summer.
__________________
03 ZR 900
93 ZR 580
LedheadELH is offline   Reply With Quote
Old 02-16-2011, 09:38 AM   #14 (permalink)
Super Moderator
 
kccats's Avatar
 
Join Date: Dec 2006
Location: Northern IL
Posts: 19,521
All that will do is loose bottom end!
kccats is offline   Reply With Quote
Old 02-16-2011, 09:57 AM   #15 (permalink)
Registered User
 
ZRTEETH's Avatar
 
Join Date: Nov 2010
Location: PA
Posts: 430
I would consentrate on the clutches and carbs. I have educated myself on "cvt clutches for snowmobiles" for the past 10 years. There are many small details that will buy you alot of power. Try and learn how to tune yours, and i mean REALLY TUNE IT. I have a 97 zrt600 that has very little engine work done (forged pistons 2 stage reeds and ground exhaust flanges on the pipes). That little triple 600 smokes skidoo rev 800's yamaha srx 700's arctic cat f7's and more all day and i weigh 220 pounds. This is very hard for some people to believe unless you ride with me, but its true. I have spent hours and hours tweaking and tuning my clutches and carbs. I have that old sled dialed in. I give credit to the clutching and carb tuning. I kept tuning and tuning and it just kept getting faster and faster. You can bolt on aftermarket stuff all day but won't do much unless you know how to tune.
ZRTEETH is offline   Reply With Quote
Old 02-16-2011, 10:25 AM   #16 (permalink)
LedheadELH
 
Join Date: Oct 2006
Location: Maine
Posts: 27
I've definetly messed with everything alot! I've probly had the carbs out 15 or so times now, had the clutches apart probly 10. Every time it goes back together a little different. Sometimes worse but sometimes much better! I've got the carbs pretty well tuned in.
I've been playing with clutching lately. I mean I had the primary off twice this morning. Put lighter tip and all together lighter weights, and then tried a couple different springs. The weights seemed to change things alot, but it only helps get the power down to the snow how you want it.

I want More Power!!

And I don't know, I am still thinking of ditching the power valves. gotta try it first, see how it feels
__________________
03 ZR 900
93 ZR 580
LedheadELH is offline   Reply With Quote
Old 02-17-2011, 08:14 AM   #17 (permalink)
Super Moderator
 
kccats's Avatar
 
Join Date: Dec 2006
Location: Northern IL
Posts: 19,521
Again more power - BIG BORE!
kccats is offline   Reply With Quote
Old 02-17-2011, 02:36 PM   #18 (permalink)
Mad Snowshoveler
 
jwaldmann89's Avatar
 
Join Date: Jan 2010
Location: Vermont
Posts: 535
Getting rid of your power valves seems like a very dumb idea...
__________________
2004 F5 1.375" Track
Quote:
Originally Posted by kccats View Post
Not Bias at all!
jwaldmann89 is offline   Reply With Quote
Old 03-09-2011, 11:50 AM   #19 (permalink)
LedheadELH
 
Join Date: Oct 2006
Location: Maine
Posts: 27
So I made my powervalves so they are WIDE open ALL the time, just to try it. Not permanant though so if I didn't like it I could put it back. Makes no difference in the world to me. I can't even tell. Those are DEFINETELY being removed for good.

I really can't afford a 1000 or 1010, or 1147 kit. As much I would like to though!

So right now I'm definetely doing the twin pipes, and porting.

I was also thinking about reed spacers?
__________________
03 ZR 900
93 ZR 580
LedheadELH is offline   Reply With Quote
Old 02-09-2013, 07:26 AM   #20 (permalink)
LedheadELH
 
Join Date: Oct 2006
Location: Maine
Posts: 27
Well I'm back! I went with the twin pipes, and redid my clutching like a hundred times to find a good setup. Thing was VERY fast. Twin pipes prolly made the biggest difference of anything else I've tried.....well untill this year.

I just put a 1010 top end on it, and it's much faster. but I can't seem to get enough fuel to it. I've got big main jets in it. big enough that I can put a piece of 3/32 TIG wire through the hole!!! Put the needle all the way up, and still a light grey spark plug. A racer near me said I need a bigger fuel pump?

Oh, and I ditched the powervalves. I don't ride trails, and don't plan to. So I made my own by sticking them way down, welding them in that way. Then I ground it all down, so it's like a nice smooth exhaust port. Came out REAL nice!
__________________
03 ZR 900
93 ZR 580
LedheadELH is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 02:54 PM.



Copyright SnowmobileForum.com

Search Engine Friendly URLs by vBSEO 3.6.0