What do you think a stock clutch is good for in a 2019 117"...HP/TQ?

 

Well, for comparison, a few days ago I changed out my clutch pack with new. OEM Harley clutch pack, $199. Bike has 30k on it, and I am rough on a clutch. I ride mostly two-up, and am in a lot of lane-splitting and stop-and-go. I give no mercy to a clutch, and I expect to change out a clutch every 40k or so. This particular oem clutch, though, was subjected to enormous slipping abuse during a trip last year to San Francisco. Hills. And where we stayed had a driveway that was a good 45-degree angle. I decided I'd do it earlier than normal, and was curious what the old plates looked like.

They are fine. Worn, but not particularly damaged. Some of the steels had some grooves in them. The friction plates had plenty of material left. I put a micrometer on a few spots and got around .150" with .143 being the minimum.

The old clutch was working perfectly, though I was getting a sort of plinking noise at times during slowing down, a noise that seems to have disappeared with the old clutch plates. Maybe they were so worn they were flopping around in there. BTW the new clutch is a Screaming Eagle product with 10 plates rather than the stock nine plates. So, and upgrade. And it works perfectly, just like the old one did.

Anyways, long story short: Maybe 50k is reasonable to go, with a changout point that doesn't involve the old clutch falling apart and leaving you on the side.

 

I'd say the stock clutch is good for 110HP 120 TQ. Anything more than that you're going to need an upgrade. Personally, I wouldn't push it to those numbers but from what I've seen to date, the stock clutch will hold with those numbers.

 

I installed the SE clutch springs rated at 1275nm. Clutch is now good for a lot more than stock. There is a sheet on the HD site that gives max torque figures for the different spring sets available.

When I ordered them at my local parts counter, they said they had NEVER sold any before. Only $24.95 retail.

Great side effect is the clutch lever engagement area changed. Pretty sure I barked the tire when I hit third gear too! I am not easy on bikes.

 

I kind'a answering my own question here...Did some looking and the HD site says the Slip Assist that comes on the CVO's is good for 135 lb/ft.

 

How difficult was it to install just the springs? Did you have to adjust anything? Asking as I have never done clutch change

 

just pull the derby cover off and the springs are right there. I’d do one at a time.

 

Need to be careful on this question as not all stock M8 clutches are the same. The 17 and 18 MY's for 107 & 114 all got a 9 disk clutch BUT the Police models, trikes and CVO got the 10 disk clutch stock. I have been told they switch to the 10 disk in all models in 2019 but I do not know that for sure. So there are two stock clutches and the SE replacement is the Stock 10 disk and what funny is when you try to buy a stock replacement from HD all you can buy is the 10 disk one. It's been this way since back in 2017 when they first came out. There is also different springs being used as well. The stock M8's had a white paint on the springs but the Twin Cams used a red paint on those and they are a stiffer spring. So you have two different stock sets of springs as well. Then there is the SE springs as well if you want a little more holding power.

 

Maybe I am blind but I don’t see the numbers that the rekluse radiusx(hd) the auto clutch. Anyone know how much TQ it can handle?

 

How was the friction zone changed? Engages closer to the grip? Increase zone length/range? It's obvious that holding power would increase with a spring upgrade, but I'm wondering how this could affect friction zone("engagement area")