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post #16 of 53 (permalink) Old 10-07-2009, 12:17 PM
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Nick,
so would i gain anything by weights on my 08 450? or should i just do the sheave as you did?
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post #17 of 53 (permalink) Old 10-07-2009, 01:19 PM
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A clutch kit will always help get you power where you want it.. Not a must have but def. Helps.

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post #18 of 53 (permalink) Old 10-07-2009, 07:27 PM
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Nick, i need a little more help if you don't mind......Ok, i'm about to show my ignorance here. I got to looking on the UTV Crap site, but did not notice any part numbers. Am i just overlooking these by chance?

Second clarification i need is.... does the clutch (or duner) kit include the weights that everyone is discussing? I see an "04 to 07 UTV CRAP DUNER CLUTCH KIT" on the site, but i dont see any specs for different weight choices, or if its for a 450, 660 or 700. Or does it fit them all? And, i assume it will work on an 08?

Sorry for all these questions. I want to give my 08 450 a little more take off on the bottom but i am also on a tight budget (who isn't these days?!) and want to make sure i have done my research before making a purchase.

Do i need any specialty tools to install a sheave or clutch kit? Or can a make shift shade tree mechanic figure it out?

Thanks again to all for the input, and hopefully others here will get some in sight from my thick headed questions.
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post #19 of 53 (permalink) Old 10-07-2009, 08:32 PM
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Mine is an 08 450 I am running a modified sheave, 12 gram weights, and the blue spring. With these mods it turns my 26inch grim reapers (that measure 26 3/4)better than it turned the stock 25's that only measured 24.25. I highly recommend doing this all at once so it is done and you don't have to tear into it for several miles. I also have several other mods but the clutch work was by far the best money spent.

If you have an impact and basic tools you should be fine.
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post #20 of 53 (permalink) Old 10-07-2009, 08:54 PM
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okay first.. part numbers.. some times they are listed, sometimes they are not.. i suck and dont add every part to the site as we have over 2500 different part numbers.. but if they are listed on the site it will appear like this:

UTV CRAP TERYX 750 60 AMP ALTERNATOR KIT [1583]

its going to the number in between the brackets [ ]

the 450s come with 12g weights
the 660s come with 13g weights
the 700s come with 18g weights

if you want to mix and match youre more then welcome to call us or email us and mix and match weights and springs and whatever else you want to do. the customer is always right with us.

you will need an impact and a spring compressor to install the sheave and the clutch kit.

here is a sheave and clutch kit installation in around 3 minutes.. we are quick like that.


the 450 is a little different, you dont have to take the seat latch off, the dont have to move the water line, you dont have to worry about the clutch cage... its a lot easier then the 660 and the 700.

=]

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post #21 of 53 (permalink) Old 10-25-2009, 07:12 PM
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I just bought a 450 this week , Looks like a upgrade in going to need to do.
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post #22 of 53 (permalink) Old 10-25-2009, 07:40 PM
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give us a call, we can get your 450 setup any way youd like. =]

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post #23 of 53 (permalink) Old 11-02-2009, 08:13 AM Thread Starter
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Finally borrowed a 1/2" impact wrench and got these installed yesterday -- found out that NO ONE around here will rent air tools because of the possibility of getting water in them. (My old impact wrench wouldn't remove the secondary.)

Haven't really had much of a chance to test it out -- only one run out of the driveway and down the street. The difference in low-speed RPM and acceleration up to about 20MPH is quite noticeable. Didn't have a chance to wind it out to see if what the top speed is -- assuming that it will still hit the rev limiter with these heavy 26" Hornies on steel wheels.

What was really noticeable was watching it operate during tests before I closed it back up.

(1) At idle and lower RPMs the belt now rides so high in the secondary sheave that the ribs are completely above the edge of the pulley. The edge of the OEM belt (still relatively new with less than 50 hours) goes ALL the way to the top of the pulley. It is perhaps 1/16" of an inch higher than before on the secondary.

(2) The lighter weights really delay how fast the primary sheave starts opening up. It's now somewhere past 1/2 throttle before the sheave starts opening, and it won't open completely until almost 3/4 throttle or so. (It would've been nice to have a tach to see the actual RPMs), At full throttle, the belt is riding at least 1/4" higher on the primary sheave than before -- not quite as high as the secondary sheave at idle -- but all the way to the top of the primary at full throttle.

(3) There appears to be a noticeable "shift point" in how the primary sheave opens, just watching it, but I don't have enough time in the seat yet to see if it is really noticeable on the "seat of the pants dyno." Not sure if this is just an impression based on the delay in it opening, or not.

Hopefully will have more impressions after this coming weekend. We're supposed to ride in a "charity ride" on the backroads and sidestreets on Saturday, then the ATV club has a night ride scheduled for Saturday night.

One tip to relate from this. When I first tried to remove the secondary sheave, the fan was blocking one of the holes that I needed to use to relieve tension on the belt -- it tilted one bolt at just enough angle to where I couldn't get it started in the threads. So I removed the primary sheave with the belt still on. When putting it back together, I positioned the fan on the secondary, then used the two bolts to keep it in the right location while I tightened it down. Don't put them in far enough to contact the inside half of the secondary sheave -- just enough to get them fully-threaded on the outside half. This won't influence the torquing or anything, yet esnures you don't end up with what I began with -- a condition where the fan had shifted slightly during tightening, and blocked one of the bolt holes.

Thanks Steve & Nick!

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post #24 of 53 (permalink) Old 11-02-2009, 01:53 PM
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more then welcome!

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post #25 of 53 (permalink) Old 11-02-2009, 03:18 PM Thread Starter
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Thought you 450 guys might find this photo helpful. While I didn't take step-by-step pics, I did take a side-by-side comparison so you can see where the UTV Crap sheave (on the left) is machined. Notice how much closer the roller can go down to the hub, after machining that shoulder out of there. Also, look how thin the outer lip is, to allow the rollers to go out farther. You can see why they claim improvements to both top and bottom end -- and why they don't use a spacer or shim for the low end. Initial impressions are that it lives up to these claims -- it is "geared slightly lower" at low RPM yet will provide a higher "gearing" for more top end.


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post #26 of 53 (permalink) Old 11-14-2009, 06:42 PM
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450 mods

so just the sheave gave you 5mph with stock cdi and no other mods........sound to good to be true!
there should be a site on here for just guys with 450's!!!!!!!!!!!!!!
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post #27 of 53 (permalink) Old 11-14-2009, 07:09 PM Thread Starter
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Quote:
Originally Posted by rangecruiser View Post
so just the sheave gave you 5mph with stock cdi and no other mods........sound to good to be true!
there should be a site on here for just guys with 450's!!!!!!!!!!!!!!
I haven't really had a good chance to see what it does on top end. I have seen 39 on the Digidash when heavily loaded on a short straight-away without hitting the rev limiter -- with two riders, a 48 qt cooler, 5 gallons of extra gas, etc. Heavy load...

The difference in low/mid range acceleration is quite noticeable -- much more responsive.

I started a "social group" here for just the 450 guys -- it's kinda like a forum, but not quite. See the link in my signature.

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post #28 of 53 (permalink) Old 11-14-2009, 07:14 PM
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Quote:
Originally Posted by rangecruiser View Post
so just the sheave gave you 5mph with stock cdi and no other mods........sound to good to be true!
there should be a site on here for just guys with 450's!!!!!!!!!!!!!!
4-5mph pulling hard and still hitting the rev-limiter.

The CDI to me is a waist unless you do some internal motor work though I only gained 1mph with the cdi And I have tried two different cdi's with the same top end result.
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post #29 of 53 (permalink) Old 11-15-2009, 09:37 PM
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clutch sheave

got real bored this afternoon and printed off some pic of modded clutch sheave's. SOOOOO... pulled my clutch off and whiped out the air grinder and fired up the compressor! about a hour later.....regreased it and threw it back together...according to the digidash 42mph!!! hell yeah! drives the same seems to pull just a hair harder in the bottom end. it was not rocket science at all and i saved myself $140 or more. i think the most important part is leaving the bottom of the sheave alone.....just grind the sides inside and out and make sure they are pretty smooth.
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post #30 of 53 (permalink) Old 11-16-2009, 08:46 AM
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can u get any more power outta a 450 by exhaust tip or just sound?
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