Clutching with portals?

**duckmans83** · 04-30-2018, 06:51 AM

So, I have a portal lift on the way. With a 30% gear reduction, think I should mod the clutch? I don't need any top end speed increase. I don't know the mud tires I will get yet but have a set of 28 in at tires I will use for trail and mountain riding. I wouldn't mind pulling the clutch cover off to make sure it's sealed good.

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**Timmi** · 04-30-2018, 07:09 AM

absolutely do the full JBS clutch. you are adding a lot of weight with the tires and extra gears to turn with the portals

**duckmans83** · 04-30-2018, 10:38 AM

I'm thinking just a shim or maybe shim and weights. Don't think the sheave would be needed due to not needing the top end back. With the greaseless weights provided by jbs and shim I think would be all I need. Don't want it loud so almost just thinking shim.

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**Timmi** · 04-30-2018, 11:54 AM

JBS uses Yamalube grease on the Dr Pulley overdrive weights. The sheave milling provides more low end than stock and a few mph top end. Try the shim and weights first to see if it's enough for you. I advise slugging the wet clutch also.

Originally Posted by duckmans83

I'm thinking just a shim or maybe shim and weights. Don't think the sheave would be needed due to not needing the top end back. With the greaseless weights provided by jbs and shim I think would be all I need. Don't want it loud so almost just thinking shim.

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**chilly2031** · 05-02-2018, 07:09 AM

Originally Posted by duckmans83

I'm thinking just a shim or maybe shim and weights. Don't think the sheave would be needed due to not needing the top end back. With the greaseless weights provided by jbs and shim I think would be all I need. Don't want it loud so almost just thinking shim.

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I have 4" portals and 35.5's. I love the full JBS clutch in my teryx of course with my tire size is geared slightly higher than stock even with the portals. With a 28 you absolutely need all the top end gain you can get or your top speed is going to be super slow. 4" portals on a machine with a stock 26" tire is intended to run a 33.8" tire to maintain exact same stock gear ratio.

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**duckmans83** · 05-02-2018, 02:28 PM

Originally Posted by chilly2031

I have 4" portals and 35.5's. I love the full JBS clutch in my teryx of course with my tire size is geared slightly higher than stock even with the portals. With a 28 you absolutely need all the top end gain you can get or your top speed is going to be super slow. 4" portals on a machine with a stock 26" tire is intended to run a 33.8" tire to maintain exact same stock gear ratio.

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Cool! I will probably wait to mod the clutch then and see how it goes then try to tune it from there.

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**MadDog** · 04-30-2018, 02:19 PM

Definetely slug the wet clutch. I run 29.5 Terminators, and I could tell a big difference before and after slug kit and full JBS clutching. Tell James the tires you are going to buy and how you plan on riding and he can hook you up with the proper set up such as which spring and which weights to run.