Barnett Clutch Replacements

Barnett Tool and Engineering has finished analyzing my clutch and sent me back some quality replacement clutch plates and springs. The guys there are real pros and got my clutch back to me within 24 hours.

I'll relay the info I got from them so if you want Barnett clutch parts for your Rocket, you can go for it. They will be listing a kit for the Rocket sometime on their site to be around $200 www.barnettclutches.com. For now you'll have to order the parts separately:

Friction plates: # K-900 RQ (8 required,$14 each), # K-900K (1 required,$14 each) and # HDP-13B (1 required,$14 each)

Steel plates: # HP-27-14 (9 required,$5 each)

Spring set: # MT-7-5 (1 set of 5 springs,$14)

Total parts cost = $199

Also some instructions from Barnett:

Make sure the friction plates are soaked in the oil that is used in the engine for about 5 or 10 minutes prior to installation.

You will note that one friction plate is a different size (# HDP-13B). This is the first plate installed and is green in color.

There is another green 'regular' plate (# K-900K) and it must be installed last (against pressure plate). This plate is made out of Kevlar and is less abrasive than the other plates in the clutch pack to prevent excessive wear on the pressure plate.

WET CLUTCH TIPS:
All friction plates using Barnett’s wet-type friction materials should be pre-soaked in oil for 5 to 10 minutes prior to installation. Use the same oil that will be used in the engine or primary. A longer soaking time will not benefit the clutch plates.

To ensure the best possible clutch life, always inspect the entire clutch assembly and replace worn or damaged components.

NOTE: The “oddâ€Â

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Here are pics of the Barnett parts along with the stock ones.



The main difference in the plates are that the Barnett friction plates use a solid ring of friction material (the green and red portions on the Barnett plates) instead of separate pads of material, so the stock parts use about half the friction material. More friction material means more grab power for the clutch and more grabbing power means it can handle higher outputs from the engine without slipping. The Barnett parts also using Kevlar composite materials should last longer than the stock parts.

Only other noteable difference in the friction plates are that the "gear" teeth are more rounded while the edges on the stock plates are fairly sharp. The smoother teeth should allow the clutch to come in and out easier though I think the effect would not be very noticeable.

The Barnett steel plates are machined so that the surface has a striated/striped texture while the stock are dimpled. I assume the striped texture give more grip for the friction plates.



Differences in the springs are obvious. The Barnett springs are wound to put more pressure on the plates.

Now if I can just figure out how the whole clutch mechanism works to engage and disengage the transmission from the crank. Take a look at this thread to see the whole clutch assembly:

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