Strange vibration

Message

blinkey501 · #16 Post by **blinkey501** » Tue Jun 25, 2013 7:45 am

With the vibration coming from the clutch and it stopping when the lever is pulled in, I would be tempted to look and replace the clutch springs.
And possibly the clutch if it needs it.
I would also check the steel plates for flatness and discolouration.
I will tell you that the Rotax does suffer from vibration and is noisy anyway.
But I would investigate the clutch as you seem very concerned

fatboy · #17 Post by **fatboy** » Tue Jun 25, 2013 8:38 pm

No doubt now this is a mechanical issue, the vibes are very noticable @ 3 to 5k rpm. Accidentally lofted the front at XXmph, in third,would I be able to do that if Im massively out of tune ?
Time to ring Mr jackson . me thinks

the vibes are getting worse, twice as bad as my Rotax MT 500

blinkey501 · #18 Post by **blinkey501** » Wed Jun 26, 2013 7:29 pm

I have though about this problem with the vibration.......... Clutch bearings?

fatboy · #19 Post by **fatboy** » Thu Jun 27, 2013 5:01 pm

Weird one, Im thinking along the lines of clutch because its not constant and worse when hot.
Will give Griff a ring, get it booked in for service work and see where we go !

blinkey501 · #20 Post by **blinkey501** » Thu Jun 27, 2013 5:42 pm

fatboy wrote:Weird one, Im thinking along the lines of clutch because its not constant and worse when hot.
Will give Griff a ring, get it booked in for service work and see where we go !

Let us know what he says ta

fatboy · #21 Post by **fatboy** » Sat Jun 29, 2013 5:20 pm

It is 100% clutch.
I was setting off this morning, with new posh silicone ear plugs in, leant forwards with my head over the clutch and I could hear it ticketty ticking, odd how hearing protection can isolate some sounds but amplify others (like when one ear plug aint fitted properly )
With a screwdriver rested on the casing, much vibration....
Hopefully its just the bearing, but much relieved its not the balance shaft !

D-Rider · #22 Post by **D-Rider** » Sat Jun 29, 2013 5:25 pm

OK - that's brought to mind an issue Keith (HisNibbs) had with his clutch release bearing.
From the description I'm guessing it's the same.

This link should help:
https://www.ridersite.com/viewtopic.ph ... ght=clutch

fatboy · #23 Post by **fatboy** » Sat Jun 29, 2013 7:36 pm

Thanks for that D-R,
Sounds like the same problem but not so advanced as Keith's.
There is a disticnt whirring in neutral,dissapearing when clutch lever is grabbed, very much the same as a tired clutch on a car with a chattering release bearing,noise stopping when pedal depressed
Now disc drive stopped working so I cant RTFM !
Will ring Fazely's finest on monday

fatboy · #24 Post by **fatboy** » Mon Jul 01, 2013 6:05 pm

Rang AP today, Lewis said take out clutch basket and check the nut underneath ( on the primary drive shaft ), sound advice.
I looked at the exploded diagram of the clutch, the one part which is not labelled, looks like a bearing between diaphram and disengagement shaft.
As its not labelled, Im guessing this is the release bearing ? ?
EDIT
just answered my own question, bought the bearing from Yorks Aprilia !

fatboy · #25 Post by **fatboy** » Sat Jul 06, 2013 5:32 pm

Finally had the time,tools and weather to dis mantle the clutch today.
I didnt find what I expected to find, the basket retaining nut worked loose, couldnt get it to shift using a 2 foot breaker bar.
The inner most plain plate has some serious blueing and what looks like a broken 'tooth', not sure if this may be a manufacturers mark or damage,
all friction plates look like they have done a days hard work or two, not sure of the wear limit, I lent my verniers to someone..............guess the rest
release bearing a bit on the rough side- replaced
I put the more worn looking plain plates toward the pressure plate,result is a lot smoother, lighter clutch but still some (lot less) vibes and noise