Scooterotica

Tom Russell wrote:

Scooterso wrote:

Tom Russell wrote:J

Also noted that the gear cluster floats backwards and forwards on the input shaft by about .4mm; this is with either both casings put together, or just looking at it with the flywheel side taken off. Maybe this bit of floating is correct and required??!! Both the bearing and the needle rollers were all replaced. I can actually see (from the clutch side) the bearing moving away (by this .4mm) from the circlip which retains it??!! Is this correct

once gear cluster (spring gear) is installed, there should be no play once the nut is tightened down. should be rock solid. maybe the center spindle is the culprit? did you replace the ball bearing and needle rollers in it?

Ok, thanks again for your help and for confirming this. Yes, I replaced both the ball bearing and the needle rollers, to be clear it doesn't wobble, it literally just moves in and out the 0.4mm, but if it's supposed to be rock solid, then I'll take this apart and investigate further!

I also had a good look at the gearbox and how it meshed with the cluster, and noticed that when in neutral, and I was able to spin the rear axle/layshaft (without the cogs moving as well), it would appear as though the cogs were collectively all oscillating on the axle, as if the axle was bent, or the shaft they sit on was oval and worn??!! The gears also did this same oscillating when I removed the gear selector and rod, so I can elminate them as a problem. Surely, it must be almost impossible to bend an axle, then again, maybe it happened when he broke the gearbox, but I suppose wear of the layshaft that the loose gears run on is more likely, as they did seem quite a loose fit, compared with a Lammy engine, that I'm more used to??

I then took all the gears off the axle and had a good look at it, and slotted it back in the rear bearing to see if I could see if it was bent, but it's very hard to tell - I just wish I had another layshaft/rear axle to hand to try!

Any more thoughts on my recent findings would be appreciated, thanks

Scooterso wrote:Im doing a p2 motor right now, and with new rollers and ball bearing, the spring gear has no back and forth play, it just spins in place and doesnt move otherwise.

the gs160 i had to change gearboxes needed a new axle as well, the broken gears chipped and damaged the axle.

did you check the gear box float shim? they need increasing in thickness with time as a lammy one does. think they start around 1.8 and go up in .2 increments (although every set of new shims Ive ordered the measurements are all over the place, so they dont seem to do them to that exact a measurement).
is it PX or PE? i.e. one end shim, or 2 shims at either end?

mick1 wrote:Thinking outside the box (excuse the pun!!)....could the noise be coming from the top end (crank/main bearings/piston slap/etc) the gearbox having problems may have caused damage at the top end....just a thought

bazman wrote:If we're talking about the primary drive ( main gear which mesh with the clutch gear?) If so i also have play ( in and out , not excessive but there) and all my engines are sweet. Would discount this and look more at clutch? Cheers