ZR 440 sno-pro vs. Z 440 sno-pro - Page 2 - HCS Snowmobile Forums

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Old 11-06-2006, 03:17 PM   #11 (permalink)
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how much horsepower would a clutch kit add?
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Old 11-06-2006, 08:25 PM   #12 (permalink)
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how much horsepower would a clutch kit add?[/b]

none.. a clutch kit will make your clutches shift more efficantly makeing better use of the power you already have.
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Old 11-06-2006, 09:44 PM   #13 (permalink)
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would i get a better holeshot or will i not notice a difference?
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Old 11-17-2006, 05:26 PM   #14 (permalink)
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Ok, here is a summary. The guys have pretty well covered the differences. ZR440 is liquid, powervalves, pulls harder. ZR440 SnoPro is higher strung than Z440SnoPro, meaning it is more prone to problems.

History of the Z440 (Fan):

431cc fan engine has been around forever (since the 80's) offered with twin carbs, or single carbs. Single carb version put out less hp.

I know the 1995 440Z was a consumer sled (SnoPro was not available). The 1995-97 440Z put out 50hp (twin butterfly carbs). Engagement was about 3500RPM. The 440 fan engine was also offered in other models, but had a single carb. Engine output for single carb was about 42hp.

In 1998-99 the 440Z SnoPro was introduced. Advanced timing and a tuned pipe helped increase power to 56hp. Also, a stiffer primary spring raised engagement to 5500 RPM. Also may have had heavier weights and a compound helix (not sure on that one).

In 2000, the 440Z SnoPro had even more aggressive timing and pipe tuning. Power went to 62hp.

In 2002, the 440Z SnoPro underwent even more fine tuning. Power went to 67.5hp.

I have a 2000 440Z SnoPro. You cannot get an aftermarket can or pipe. Reason is because there is no room for improved power, so nobody makes them. Arctic Cat maxed out the performance by advanced timing and tuning the pipe. However, you can get clutch kits to change your powerband. I have the Black Magic Heartthrob clutch kit in the 2000 440Z SnoPro. Clutch engagement is about 5600 RPM, and it rip snorts off the line resulting in dramatic ski lift off the holeshot. It also pulls very hard in midrange. Starts to run out of steam toward top end, but still reaches over 80mph on hard pack or ice. Feels just like mildly tuned liquid cooled 500. From 50-80, it pulls slower than a performance liquid. However, I could easily beat older Polaris Indy 500's from 0-70mph. The 440ZSnoPro must be set up properly to kick ass. Make sure clutches are clean, make sure you are engaging at least 5500 RPM or higher, and make sure your belt is the correct one. Belt is important because it is a little motor, and cannot pull a longer belt. My 440Z SnoPro has no bogging. It is completely dialed in. However, it was not dialed in when I first got it. It bogged when I first got it. Previous owner raced it and just mismatched all clutch components when he got ready to sell it. That is primarily why I bought a clutch kit. I know Speedwerx also makes a clutch kit for the Z440 fan. I highly recommed a clutch kit for this racey little twin. It really wakes it up.

Just my two cents worth.
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Old 11-17-2006, 07:51 PM   #15 (permalink)
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thanks for all the info matt, i just bought a 2001 arctic cat z440 snopro last weekend, im thinking i will get a clutch kit but i dont want to spend a lot of money on one. my clutch engages at around 4000 rpms i think. how could i make it engage at higher rpms?
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Old 11-18-2006, 09:27 AM   #16 (permalink)
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mzill,
Yep, your spring is either broken, or weak. 4000RPM is way too low for engagement. Needs to be at least stock specs which is 5000RPM. Clutch kits cause it to engage higher at 5500 or 5600. Like I said, mine comes in at 5600 with the Black Magic kit.
Engagement is controlled by the stiffness of the primary clutch spring. Just get a brand new stiffer spring. Your options are to go to Arctic Cat dealer and get a new stock spring or call either Black Magic or Speedwerx. Speedwerx sells standard steel springs (cheap $20) or titanium springs (expensive $100). Sounds like you want to go with the cheaper one, and that is fine. Titanium is good because it is stronger and wont break. However, you can get a clutch kit for $200 or less, so it depends how much you want to spend. Spring is an easy change if you have a clutch puller. Puller is $20 (just a long device that looks like a 12 inch rod with threads and bolt head on one end.

Primary Clutch Spring Options:
1. Arctic Cat Yellow/White part number 0746-229 (info right from my 2001 Arctic Cat performance manual. (This stock spring will engage at 5000RPM)
2. Black Magic primary Spring #70-1260. (this BM spring will engage at 5600RPM). I have this one in my BM Heartthrob kit and it comes off the line like a missle).

I guess I have become kind of an expert on this sled, as it has been fun getting it fully dialed in. Like I said, when I first got it, it had the wrong belt, springs, weights, and helix. It was all messed up, and was doggy and boggy. I just couldn't stand it cuz I knew these sleds can be fast for little fan blowers. I had drive one in the past and recalled that it was very fast for a fan. I did my research, got the BM clutch kit, and finally got it where it will surprise many larger displacement liquid cooled sleds up to 60 or 70mph.. I have lots of info on this sled and have a few older BM catalogs and the original AC owners manual, and AC performance manual. Let me know if you need the specs for your sled, or the Black Magic info. I can scan them and email them to you.
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Old 11-18-2006, 10:17 AM   #17 (permalink)
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Quote:
i know that ZR is liquid-cooled and Z is fan-cooled but is there any power differences, im thinking the ZR has more but how much more? which motor is better l/c or f/c? is there any other differences? does anyone have a stat sheet on these sleds, perferable on a 2002 z 440 sno-pro?[/b]
i would have to say liquid cooled has a lot more power, because it cools the engine down a ton faster than fan cooled.
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Old 11-18-2006, 07:48 PM   #18 (permalink)
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i just checked and mine engages at 4,500 rpms, i can take my sled for a refund at anytime, should i? i know it needs the rear shock rebuilt i think they will do it for free and has a few cracks in the belly pan and one tiny crack in the hood. i paid 1,700.
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Old 11-19-2006, 02:22 AM   #19 (permalink)
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Hey Matt L what do u know about the 2003 z 440 Sno Pro? Thanks.
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Old 11-22-2006, 10:21 AM   #20 (permalink)
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mzill
No, I would not return your sled. $1700 is a great deal for your sled. You will like it once you get a new primary spring and make sure your other clutch parts are accurate. I misspoke before when I said my Black Magic spring engages at 5600 RPM. I checked it yesterday and it engages at 5000 RPM. They have springs that engage at 5600, but the one I have and the part # I listed engages at 5000 RPM, which is exactly like the stock spring. My mistake. If you are engaging at 4500, then you should simply get a brand new Arctic Cat Yellow/White spring part number 0746-229--check your local dealer and tell them your primary spring is weak and you want a new stock one for free.. and make sure you get the part # I listed. I remember now that my stock yellow/white was coming in between 3800 and 4200, and that was dogging the motor off the line. These springs get weak after awhile, so the result is a lower engagement. I have all the specs for the 2001 Z440 SnoPro, so if you want me to scan and email them, just drop me an email to lajoylaw@yahoo.com.

Snow21usa,
Your 2003 Z440 SnoPro has higher horsepower than the 2000-2001. Your motor has more aggressive timing and a fatter pipe. Your motor puts out 67.5 hp vs mine and mzill's which peak at 62hp. Damn you!
I am not sure if you have Fox adjustables, or if you have ACT adjustables. All I know is that once these little fan blowers are dialed in just right, we can put a beatdown on the unsuspecting big boys up to 60mph.
Matt

Here is an old ad for the 2000 Z440 SnoPro. I have more literature, I just cant find it now. I will dig for more. Also is a picture of my 2000 ZSnoPro (that is me with my cute little daughter) I've recently removed the race numbers from the windshield, and repainted the sliderail.
Attached Images
File Type: jpg 2000.Z440SnoPro.jpg (39.0 KB, 51 views)
File Type: jpg 440Zsnopro_IMG.JPG (613.9 KB, 53 views)
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