How to check play in crank?

grab the flywheel and try to get some up and down movement. you shouldn't get any of course but when you do.....!

when they are gone it'll show as a very small clonk-clonk!

regards

Taffy

what about axial play Taffy? or does the 04 have ballbearing mains?

he didn't ask that damon.

regards

Taffy

if you have rollers the crank needs to have axial play ie move left to right across the bike if it doesn't have any its potentially worse than having a bit of radial play.

axial float of the crank 0.3 to say 0.6mm but some use 1mm. pull the ignition cover off and see if the flywheel goes clunk as you push it in or out, taffy measures his with calipers, zero at one extreeme between the case and the lip of the flywheel and slap teh crank to the other, the measurement is the crank axial play or endfloat.

radial play is speced as 0.03 to 0.04mm and needs a DTI to measure properly, put the foot of the dti on the flywheel at 12 o clock and move the flywheel up and down, you can do the same on the drive side on the end of the crank

by hand though 0.03 feels good, 0.04 feels like its just on the way out but seems to work fine 0.01 feels like it doesn't move at all but it works fine too. whatever the measurement is cold it grows when the engine is hot, sp I guess ideally you want just the tinyest discernable ammount of radial play.. no more.

from the factory my bike initially had 0.01mm radial play on the drive side and 0.04mm on the ignition side. at 170Hrs both mains had gained 0.01mm radial play and stil looked good though the tight one was a little more worn than the other.

Id be concerned with a radial play of 0.07mm (0.3thou) or greater.

axial play is the important one as it can change without notice there are pics in the DOC on measuring it.

Ive got some pics I need to put up of some mains that have had zero endfloat a few times the ends of the rollers are in bad shape.

its nothing to do with oil as far as anyone can tell,

I use delo