Best clutch set up for 33” tires - Yamaha Grizzly ATV Forum
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post #1 of 5 Old 05-18-2019, 01:20 AM Thread Starter
 
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I’m in the process of building my engine now 734bbk 12.1 cp piston 2mm over valves raptor hot cam stage 2 and full port and polishing and I have 33” tires on the way I do a lot of thick mud riding and I’m waiting a good clutch set up

I’m currently running 31” tire stock engine I don’t know what kind of clutch work I have bc it was built like this when I got it

I’m also looking for a map for my new set up if any has one I have the power commander v

Thanks in advance

send it
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post #2 of 5 Old 05-18-2019, 11:02 AM
 
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Welcome from Colorado.
I figure you have a 700, and recommend you add a signature listing your mods as you go along. This helps us stay current with your ride to help with the best information.
You are adding a lot of power, so I suggest you look into wet clutch slugs to transfer power to the primary. Then I suggest you raise your pulley ratio using COOP45 machining and maybe a little shim in combination with your machining. You are going to need a heavier secondary spring, and if m.p.g. is not your concern you can use lighter primary weights to prevent up-shift.
If you are running a lift kit expect to break the stock axles, but that is the price of playing in the peanut butter mud.
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Jim,
Fast Green Convertible "06" 660 on 26" BH OG's with Stock Wheels.
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post #3 of 5 Old 05-21-2019, 01:44 PM
 
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You could also check out EHS racing fuel controller. Its pretty easy to use and you can do it with out a laptop. I would also consider a stiffer secondary spring like a EPI Gold for those big tires. I would get a hold of Coop45 and see what he thinks as I am no expert on the clutching. A sheave cut and secondary spring will help you a lot for what you are going to do from what i have read.

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post #4 of 5 Old 05-21-2019, 03:48 PM
 
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By all means, no matter what you do, INSTALL wet clutch slugs.
With those tires and an nasty engine build, you will burn up the wet clutch. Slugs help the wet clutch survive.
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post #5 of 5 Old 06-05-2019, 08:18 AM
 
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Quote:
Originally Posted by dieselman324 View Post
Iím in the process of building my engine now 734bbk 12.1 cp piston 2mm over valves raptor hot cam stage 2 and full port and polishing and I have 33Ē tires on the way I do a lot of thick mud riding and Iím waiting a good clutch set up

Iím currently running 31Ē tire stock engine I donít know what kind of clutch work I have bc it was built like this when I got it

Iím also looking for a map for my new set up if any has one I have the power commander v

Thanks in advance
Let me know if I can help you out!
Thanks
Coop45

700 Grizzly Coop Mod#2 & 3 http://www.youtube.com/watch?v=H_r_hlvlIeE

660 Rhino with stock tires and ignition low range top speed, Coop Mod #2 & 3 http://www.youtube.com/watch?v=ErbdoTCDmQM

700 King Quad Coop Mod #4 http://m.youtube.com/watch?v=SdzJLzODens
Best Bang For Your Buck Clutch Modification!
Please PM me for info.

Thanks
Coop45
The originator of the machined sheave Mod#3 and Cam plate Mod#2 and the original 2mm shim Mod#1
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