EPI clutch kit (2016 Grizzly) - Yamaha Grizzly ATV Forum
General Discussion Welcome to General Discussion. This is a general forum where we talk about anything that is NON-GRIZZLY related. Please post in the appropriate forum that relates (we have engine forums, tire forums, accessory forums...and all the others too) to your topic. This way when someone (including us) comes here to look for answers, it will be a lot easier to find info. If you are posting something in general that you cant find a forum for, then this is the place to put it. Thanks for helping us try to get the info organized.

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post #1 of 20 Old 04-19-2017, 08:57 PM Thread Starter
 
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EPI clutch kit (2016 Grizzly)

Anyone running the EPI sport utility kit and 27" tires, I have Zilla's? if so can you tell me what it did for your bike? I just ordered the kit what are the 5 little springs for? and are they needed? Thanx
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post #2 of 20 Old 04-19-2017, 09:14 PM
 
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The general concensus is that clutch "kits" are a waste of money. Shims and a spring would probably get you what you're after. If that isn't enough, look into having your primary sheave machined. Have you researched clutch mods much? If not, do so and then think about getting your hard eaned cash back for that clutch kit. What type of riding do you do? How tall do your 27" Zillas actually stand? Many tires run short of the stated height. I'm turning 26" (26 1/2" true height) Big Horns with 1.7mm shim and a purple spring just fine. It wheelies in low and has plenty of pep in high. And we're talking around 30 bucks in parts. A machined sheave is on my list... but it's a long list. lol

-2014 Grizzly 700 EPS, Camo
26" Bighorn OG's, ITP Black Ops SD Beadlocks, Garmin Dakota 20 with Ram Mount, KFI SE 3500 Stealth Winch, Midland GXT5000 2-ways, Heat Demon dual zone, Wes Industries trunk, Full Ricochet skids, Moose 2" receiver, 12" combo light bar, whiskeymike custom dash, Blue Sea 5025, Rotopax 4 gallon pack, Water Wetter, Purple spring, Powermadds, flood cubes, 1.7mm shim, Uni air filter, Rock lights, Gold Plugs, Rox Risers, Halos
http://www.grizzlycentral.com/forum/...ld-thread.html

-2015 Popo RZR S 900
-2014 Sportsman 90
-2016 Outlaw 50
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post #3 of 20 Old 04-19-2017, 09:20 PM
 
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X2 to what okbear says. Cancel your order before they ship it if possible. If it's too late for that, don't even open it and return it as soon as you get it.

To specifically answer your question about the springs, they are called stall springs and go in the wet clutch weight pack. All they will do for you is raise your engagement rpm and wear your wet clutch shoes out prematurely.

2011 Grizzly 450 EPS
Artrax CTX 26-9-12's all around
on Rock A168 rims
JBS sheave - no shim
18 gram Dr Pulley overdrive sliders
MotionPro twist throttle kit
rear brake lever run in vertical orientation
gripper seat cover
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2004 Rancher AT
it's finicky and a turd but
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post #4 of 20 Old 04-20-2017, 08:13 AM
 
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X3. My 2016 has a JBS sheave, 16g weights, a purple EPI spring, and a 1 MM shim. It is way better than stock but I also have $350-$400 invested in it.

My buddy has the same bike with 16G weights and 1.5MM shim. His feels almost as good as mine and he has about less than 1/3 of what I have invested. If I could do it over again, I would have changed weights and added shim.

Green 2016 Grizzly 700 EPS
26x9x12 Bearclaw HTRs
Yamaha Glide Plate
Eagle 3500lb Winch
JBS sheave w/ 16g weights and purple EPI Spring. 1 MM Shim
Rox 5" Riser Kit
EHS Tuner

Sold-2009 Grizzly 550 EPS w/ 4,800 miles
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post #5 of 20 Old 04-20-2017, 10:15 AM
 
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Does your buddy have the same tires as you? What actual height are your Bearclaws?

2016 Grizz EPS LE
Painted Red Winter Edition
26x9-12, 26x12-12 Bighorn OG
Just purchased, give me some time and this list will get much longer. Best mod here is the San Juan Mountains!
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post #6 of 20 Old 04-20-2017, 01:41 PM
 
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My HTR's appear to run true to size. He was running 26" Pitbull Growlers. Both on stock rims.

Green 2016 Grizzly 700 EPS
26x9x12 Bearclaw HTRs
Yamaha Glide Plate
Eagle 3500lb Winch
JBS sheave w/ 16g weights and purple EPI Spring. 1 MM Shim
Rox 5" Riser Kit
EHS Tuner

Sold-2009 Grizzly 550 EPS w/ 4,800 miles
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post #7 of 20 Old 04-20-2017, 03:20 PM Thread Starter
 
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wow...... l asked for an opinion on what. that paticular kit will do, not what you thought about my purchase! if l needed advice on how to save money l would have asked my wife
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post #8 of 20 Old 04-20-2017, 03:51 PM
 
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Quote:
Originally Posted by leeroy300 View Post
wow...... l asked for an opinion on what. that paticular kit will do, not what you thought about my purchase! if l needed advice on how to save money l would have asked my wife
Wow is right. I can't remember a time when a member has said, Thank you for stopping me from throwing my money away." quite like that. Since only information on that kit is desired, you should call the manufacturer and ask them. I'm sure they'll tell you how awesome it is. Do report back and let us know how that worked out for you.

-2014 Grizzly 700 EPS, Camo
26" Bighorn OG's, ITP Black Ops SD Beadlocks, Garmin Dakota 20 with Ram Mount, KFI SE 3500 Stealth Winch, Midland GXT5000 2-ways, Heat Demon dual zone, Wes Industries trunk, Full Ricochet skids, Moose 2" receiver, 12" combo light bar, whiskeymike custom dash, Blue Sea 5025, Rotopax 4 gallon pack, Water Wetter, Purple spring, Powermadds, flood cubes, 1.7mm shim, Uni air filter, Rock lights, Gold Plugs, Rox Risers, Halos
http://www.grizzlycentral.com/forum/...ld-thread.html

-2015 Popo RZR S 900
-2014 Sportsman 90
-2016 Outlaw 50

Last edited by okbear; 04-20-2017 at 03:58 PM.
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post #9 of 20 Old 04-20-2017, 04:22 PM
 
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Quote:
Originally Posted by okbear View Post
Wow is right. I can't remember a time when a member has said, Thank you for stopping me from throwing my money away." quite like that. Since only information on that kit is desired, you should call the manufacturer and ask them. I'm sure they'll tell you how awesome it is. Do report back and let us know how that worked out for you.
bottom end bog

He didn't care what I said either I guess, lol. Can lead the horse to water....

If you want to run the kit, run the kit. Run the stall springs even.

YACC #44

'13 camo 550-SOLD

'15 700 SE-

-27"bearclaw HTR's/STI beadlocks
-2" snorkels/EHS fuel cont./extended. batt. cables/exh. tip OR barkers
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-2x pelican 1200/2x pelican 1400 cases
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post #10 of 20 Old 04-20-2017, 04:50 PM Thread Starter
 
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l chose not to do the shim ( dont like messing with belt hiegth is why).So I purchased a kit because l am a long way from home working and the convenience of one stop shopping and only one shipping cost made it worthwhile at this time and was hoping to to accomplish a similar result. And if you read my first post l did ask for advice on the stall springs! Oh well l tried
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post #11 of 20 Old 04-20-2017, 05:06 PM
 
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Quote:
Originally Posted by leeroy300 View Post
wow...... l asked for an opinion on what. that paticular kit will do, not what you thought about my purchase! if l needed advice on how to save money l would have asked my wife
I didn't respond earlier as I was talked out of the e.p.i. kit years ago by others that got screwed by purchasing the kit. I didn't have first hand experience so I stayed out, but now you mentioned money I can get in.
I guess the others tried helping, thinking you wanted improved performance from the kit, which has not been reported on G.C. that I can remember for a very long time if ever, but their help didn't tell you why the kit is not good.

I can tell you the stall springs come in 500 rpm increments, but as you didn't tell us which spring was in the kit you ordered, I have no way to tell you the engagement point for the new springs. What happens is the shoes inside the wet clutch drum turns faster before the shoes engage, so like dumping a manual clutch, the parts wear faster. How much faster? who knows.
Then lighter weights make the engine scream without producing a single oz. of improved engine power. The weights retard the up-shift rate so basically the kit changes how the power is applied, like dumping a manual clutch in your car.
I tried lighter weights myself and that was a bad idea, but easily corrected by going back to the stock weights.
The Yamaha C.V.T. system is very sensitive and reacts quickly to small changes, kinda like some of the members here on G.C.
Its hard to tell what an exact reaction is going to be with new mods, and the local conditions play a big part in how the change is accepted. Here in the mountains, the facets of the kit are not wanted like in the mud pits down south.
There's one thing to remember about most of us on G.C., we don't care if we save you money, in fact we like spending O.P.M. We're more concerned about getting you/others the best results, like recommending O.G.'s instead of similar knock-off tires, or machining over a kit or........

Jim,
Fast Green Convertible "06" 660 on 26" BH OG's with Stock Wheels.
COOP45 Primary, 1.5 mm shim, -1.5 mm belt, Purple Secondary Spring,
21 gram weights, weight covers reduced to 29 mm diameter and a 2 mm Cut Cam Plate.
2 heat range hotter plug, Warn Winch, Passenger Foot Rests, Rock Deflectors, Heated Grips and Hand Mitts,
Grab Strap, Cooling System Up-Grade and multiple position mirrors.
8040 miles, 812 hours on 1-1-15
Y.A.C.C. #43
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post #12 of 20 Old 04-20-2017, 05:15 PM Thread Starter
 
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not sure which spring but it is supposed to be thier sport/utility kit combo for 27-28" tires and thanx for the info l know now what to sort of look for when l get it installed. lighter weights in my 07 grizz helped
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post #13 of 20 Old 04-20-2017, 05:33 PM
 
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Quote:
Originally Posted by leeroy300 View Post
not sure which spring but it is supposed to be thier sport/utility kit combo for 27-28" tires and thanx for the info l know now what to sort of look for when l get it installed. lighter weights in my 07 grizz helped
The spring is the secondary spring and it will probably be the gold spring.
The springs are rated by color for the different loaded and unloaded positions, and there isn't much difference in the tensions to tell you the system is very sensitive to change.
You can read about the differences here;
https://epiperformance.com/secondary-6/

Then there are the kits, not recommended by me;
This page is the problem many new members have, there is no useful information on this page,
https://epiperformance.com/grizzly-6/

Jim,
Fast Green Convertible "06" 660 on 26" BH OG's with Stock Wheels.
COOP45 Primary, 1.5 mm shim, -1.5 mm belt, Purple Secondary Spring,
21 gram weights, weight covers reduced to 29 mm diameter and a 2 mm Cut Cam Plate.
2 heat range hotter plug, Warn Winch, Passenger Foot Rests, Rock Deflectors, Heated Grips and Hand Mitts,
Grab Strap, Cooling System Up-Grade and multiple position mirrors.
8040 miles, 812 hours on 1-1-15
Y.A.C.C. #43
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post #14 of 20 Old 04-20-2017, 07:03 PM Thread Starter
 
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Thanx you are very accurate in your statement about the lack of info but you have helped me Thanx. 9 years ago everyone was very helpful with the info you wanted and not go off on other things because they wanted to vent at any chance.
And you are correct about the sensitivity of the system 5lbs is a different spring! what about the other springs in the kit... yay or nay?
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post #15 of 20 Old 04-20-2017, 09:00 PM
 
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I haven't used the other springs.
I learned there is a lot more low end performance by the mods I have listed in my signature, and I do my own work so I don't have to pay $$$ to someone else to change my set-up.
What I learned from several others that tried the stall springs is the stall springs cause more wear to the wet clutch system and are harder on the axles.
I ride across mountains and fast streams and can easily be 75 miles from the truck, so I found more reliable ways to add snap to the grizzly low end performance.
I spend more time in the garage getting the right set-up installed before a ride so I don't have a long walk across the mountains from parts failure and here is an example;
from the front,

and from the back,

then this was at 13,000 ft., I was able to roll the grizz onto the rear tires next to the edge without concern for the axles.
https://www.flickr.com/photos/980489...57634967260656

My set-up relies on the lower stock stall springs for wet clutch engagement at the lowest engine r.p.m. so there is no hard hit when the power comes on.
With the higher pulley ration the torque is multiplies so I can use high gear when others shift to low.
This is a video running the Wall on Poughkeepsie Gulch. The video is several minutes but the important part of running the wall unaided is the first couple minutes.
This run took me several years of practice with a winch hooked up top to determine the best line and how to hit the rocks without falling to the bottom.
Notice the speed at the bottom of the upper level. Then notice when I stopped with the front tires hung on over the top edge, the grizz was in two wheel drive. I didn't want torque steer to twist the grizz around half way up, so the best way to that was not to use the front drive.
Listen to the engine sound and how little I needed the throttle. That was from the low engine torque being magnified to what I needed, but the true benefit of the magnified torque is the throttle control in touchy situations.
The throttle control and benefit from the magnification is seen once I get the front end engaged to diff lock to crawl over the top edge. Notice how easily I could spin all 4 with very little throttle and engine noise.

If you have read this far there is something else many haven't learned, and that is there is a lot of pressure from torque to the belt, and for this reason I decided to be easy with the system, or no more abusive than required.
To show what the belt goes through here is a video of the belt turning with the transmission in park. Notice the distortion as the belt is pulled around the secondary. I feel a hard hitting wet clutch is just asking for problems, but if you ride in a park near the truck, your conditions may not be an important factor in set-up design.

Jim,
Fast Green Convertible "06" 660 on 26" BH OG's with Stock Wheels.
COOP45 Primary, 1.5 mm shim, -1.5 mm belt, Purple Secondary Spring,
21 gram weights, weight covers reduced to 29 mm diameter and a 2 mm Cut Cam Plate.
2 heat range hotter plug, Warn Winch, Passenger Foot Rests, Rock Deflectors, Heated Grips and Hand Mitts,
Grab Strap, Cooling System Up-Grade and multiple position mirrors.
8040 miles, 812 hours on 1-1-15
Y.A.C.C. #43
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