Engine balancing

[quixotic]

Well, I finally got around to trying this on the rear mounts as well.  I used a 6mm deep slice of aluminium tubing (22mm ID) filled with an  8mm thick doughnut of the tie rod polyurethane material.  You can see it in the photo where the poly has been forced out by the 12 foot/lbs of torque on the engine mount nuts.  You can also see where I added on an old Miata wheel lug nut with blue loctite to keep everything in place.  And then to give me enough threads for the lug-nuts (probably less than , I repositioned the exhaust pipe hanger to the foot peg bolt.

Wow!  Even when I kept the bike at 4,000 to 4,100 rpm steady (the worst area of vibration remaining after I did the front mounts), I couldn't detect any vibration.  Smooth as silk all the way up the rev band.  

I guess the only question is how long will it last?  There's the question of the tensile strength of the aluminum, as well as the possibility of more poly being squeezed out.  But I'm happy for now.  

[Motu]

My Mono doesn't...or didn't vibrate.  However I've just been into the gearbox to do a broken pawl spring, and a few other things you have to as a matter of course on such a job.  At a 100,000km I also had a look at the clutch. I could see the white paint marks, so thought sweet, factory markings I'm good to go.  But putting it back together a couple of weeks later I find only 2 of the 3 elements are marked, the pressure plate which sits behind the cover plate has no mark. And also I can't get the 2 marks I do have at 120 degrees...the next bolt holes around, but no way are the white marks 120 degrees.

So now I have a slight vibration at 5,000rpm - all good everywhere else in the rev range, but just a noticable amount at 5,000. Far less than an LS I've ridden, but more than it had before.  The clutch is down to 5mm, so I should have at least 30,000km left on it...3 years commuting.  I'll give it a few months, or until it annoys me and go back in there to see what, if possible I can do.

[tvrla]

I've 'balanced' the clutch pack by suspending with a string up the middle. The discs will be parallel to the ground.  Adjust positions till it doesn't lean one way or the other.

[montmil]

I've 'balanced' the clutch pack by suspending with a string up the middle.

A local neighborhood Airhead buddy refers to that technique as his "Thong Method."  [smiley=thumbsup.gif]

[montmil]

I've 'balanced' the clutch pack by suspending with a string up the middle.

A local neighborhood Airhead buddy refers to that technique as his "Thong Method."  [smiley=thumbsup.gif]