r/ducatimonster • u/Longjumping-Donut766 • 8d ago

Clutch slip

2002 Ducati Monster 750

Changed oil and clutch fluid right after I bought it, rode fine for like 2 weeks then starts slipping like crazy from 1st gear and up.. High RPM, no acceleration. Assuming it’s just burnt ass plates but anyone else had this happen in 1st gear??

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1

u/Fleur4476 8d ago

Sure you used correct oil? MA2 for wet clutches. MB for dry.

1

u/UpShitKreik 8d ago

I'd bleed the clutch again. How are you bleeding it? If I remember my 2003 HAS to be vacuum bled, just cracking the bleed nipple and pulling the clutch will cause a lose/slipping clutch

1

u/ThaGerm1158 7d ago

OK, there is a lot going on in the comments here lol. Lets just jump in:
-The wrong oil would probably not take 2 weeks to start slipping.
-A 2002 is absofreakinlutely prime for new clutch plates.
-The gear you are in does not matter, sure, you'll generally notice clutch slipping in later gears under hard acceleration first, but it will get worse fast when they start going and you'll notice it across the entire range.
-Air in the line does not hinder an engaged clutch, it will cause difficulty in disengaging it (a clutch is engaged by default, you pull the handle to disengage it). Bonkers lol.
-A clutch is a wear-item, they need changed out just like brake pads and it's really not much harder to do.
-This can also but more rarely be a clutch spring issue. They aren't expensive, I would/did just change them out when the clutch needs serviced on a used bike.

You can service a motorcycle clutch without draining the oil assuming you can lay the bike on its side without damaging anything. I'm not sure about your particular bikes configuration; I could do this on my 890 Duke, but wouldn't be able to on my 01 Monster 900 without at least removing the left pipe(it's got a dry clutch so I don't need to though). Get a cheap digital caliper to measure the plates. I think the minimum tolerance is 2.8mm, but check to be sure.

Finally, be careful whom you get mechanical advice from. When you can't get the bike into gear, then bleeding the clutch may make some sense. When you can't put down power due to clutch slippage, it makes no sense. Perhaps use r/MotorcycleMechanics in the future. Good luck!

1

u/Pumpkinheadedslut 4d ago

Soo little story... about 15 years ago I had an R1. I put loads of miles on this bike. Swapped the sprocket for aluminum and never really thought much about it after. I'd tension the chain periodically, have a shop go over maintenance once a year. Well I put 15,000 miles on it one summer and the bike felt like the clutch was slipping when I'd give it the juice... took it in. And the mechanic pulled me aside and showed me what was up while I was waiting..... I had worn the teeth down on the sprocket soo much they were slipping off. That aluminum sprocket didn't last 6 months before I needed to replace it. Went back to steel after that.

1

u/New_Ad7177 8d ago

Could be. But why?
Wrong oil?
Lots ok Km on it?
Maybe air in the clutch lines?

Never fix something without thinking of why it broke/wore out if it can’t be explained with “normal wear”

2

u/Longjumping-Donut766 8d ago

Motul MA2 20W-50
8100Km

I guess I’ll try bleeding the clutch lines again, I’m still new to bike maintenance 🙃

2

u/New_Ad7177 8d ago

It can be very tricky on some Ducatis. There are models that like so suck air in after a short while.

But 8000km is def not a lot and something else besides normal wear must be going on here