Old Cafe Racer in Northern Oz
Join Date: Oct 2009
Grabby, shreiking, clutch and how I cured it
Like a lot of others here since I bought the 748 a couple of years ago the clutch has misbehaved when hot.
Not a lot of fun when it lurches foward, shreiks then either stalls or wheelies at the lights.
Since I've had this 748, the clutch has been a problem.
The original was grabby, graunchy & noisy.
I replaced the stock plates with sintered ones & it was still the same, if not worse.
Then I put the Sureflex one in and it was absolutely beautiful until a couple of weeks ago when it started the slip.. .grab... shreik... stall thing.
I removed it, did the plate shuffle, polished the steels and replaced it... no better.
Yesterday I couldn't get the bastard up the ramp,.... shreik... grab......stall... slide backward down the ramp with the front wheel skidding.
The ramp up to my bike house is 1 metre wide, 4 metres long and is 1 in 3 slope with no side rails, a very scary place to be with a misbehaving clutch.
You can't simply ride up it as there is only an inch clearance each side from the door frame to the mirrors at the top, it's clutch & brake every inch of the way.
So, today I did something I read about a while ago on here... I removed the pack, brushed black lithium grease on a set of spare plates, hit them with a heat gun till they were around 120*C
Then I cleaned the excess grease off & reinstalled things.
I thought long and hard about this first as grease would seem death to clutch plates? but wait! what about oil bath clutches? do they slip? No they don't. So petroleum based lubricant shouldn't be a problem as long as it has no friction modifiers in it.
Any way I took her out for a run today, ambient around 34*C, and the clutch seemed very smooth, especially on down shifts.
I ran her up to 8000 rpm in sixth gear & went WOT to try & make it slip... next thing I'm doing 200kph with a big grin from ear to ear and no sign of slip.
I rode 40 fast miles to get some heat into things then took it home & rode very slowly up the ramp slipping the clutch all the way.
I had complete control over that clutch, smooth as butter.
So.. it's black lithium grease for me from now on
So from me to Vij & Tom Tom "A very solid thank you"
Tom reckons it lasts him a season on his plates.
Last edited by davy.j; Oct 30th, 2011 at 9:38 am.