Katana Owners Club U.K.

Rumours of my 650's crank early demise after only 280.000 seem to be suruptious, indeed the offending grumble from the bottom end which was present at 3000rpm until 6000rpm , when all was well , has gone!!!!!!

It has however been replaced by ... a treeeeeeeek sound and vibrations on the left foot peg in 1st gear . The gear selects fine , no stiffness , just touch the lever and it slips in both up and down.
This treeeeeeeeeeek noise disappears when 2nd and all other gears are selected.
I will add that I can make it treeeeeeeek also by quickly dropping down a gear at cracking throttle open.
It seems to be coming from the rear of the engine , ie; shaft output.
I suspect this bearing has joined it's pop up stablemate in a direct action .

Oh and it was only a treeek noise on Monday . The bike still pulls well and cruises at motorway speeds no hassle.

Anyone else suffered such a noise.?

My shoulder makes a funny noise when i twist my arm.

Pete

Back in the Dim & Distant Past, as it were.....



I had a 50cc 2 smoke that went DRRRRRRRRRRRRRRRRR for about 10 miles before the big end siezed totaly.

I had a Royal Enfield Crusader Sports that went "Clunk" as the conrod was stuffed out through the front of the crankcases by the crank pin, the big end bolts had sheared just prior to that event.

And I had a Plastic Maggot that made an incredible sound as it left me behind sliding down a stretch of wet tarmac.

Does that help?

Would the output bearing not be heard in all gears at all speeds mate??

i can get my kat to make that noise if i change into 5th too early and the revs are a lil low.... doesn't seem to make it in other gears though. there's also a grumble when i take off from the lights and don't give it enough welly.... i also suspect the output shaft bearing... but then the crank end is knackered on mine too along with a noisy cam chain and it smokes a lil so i'm struggling to work out whats what.... sounds like output/gearbox bearing to me though

I'll take a guess at the clutch, somethings broke, maybe the basket ?, in 1st gear the bike has the most thrust, with less in the other gears it's not enough to make the noise

Output, that sound plausible. I suffer from "Prrrrrrrrrpt" or "Phhhhhhhhft", which is even worse -





















after I have had onions.

oh well after a week nd 1200miles it hasn't repaired it self, indeed the treeeeeeeeeeeeeeeeeek sound has become a daker daker daker noise in light metallic machine gun sort of way in first accompanied by a rather natty whine, which stays at the same level not matter the speed.

I think this engine has just been retired, S2 ready for work tomorrow. until end of month then the other 650 will be taxed and fed to the lions!

Arnica at first I thought ( hoped) clutch but the noise dosen't alter when the cltch is used and the action is still smooth and precise.
Now the noise is so constant , that it has to be the shaft drive output, when setting off the weight would be upward but when moving the uj is straighter so less friction, now it's constant there must be so much play.
I will remove the rubber boot later and hopefully suss out whats what.
Either way if it has to come out, it'll be time to rebuild the whole thing ................or weigh it in.!

Have a word with Jez. He bought a ton of 650 spares the other day.

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Pete