Scooterotica

Hi All.....
Just had an issue with my cush drive coming loose and "scraping" the engine casing and it is noticeable from the outside....
I originally thought I had seized the engine as I could not kick it over but on taking the engine out and pulling it apart noticed what was really going on with it..Managed to tighten it up again but not ready to ride it.
Couple of questions if any one can assist.
1/ Any idea why it might have happened ?
2/ Why would it seem like an engine seize (all free now with side casing off piston moves freely and no damage in barrel or on piston)
3/ And advice on damage to look for ( As apart from it being loose, none noted?)
BTW its an RB22

its very likely that the top cap was not lined up with the splines when tightend

Agree as Ricspeed says , or threads are not good in the Crank or not Tightened fully when fitted lucky you caught it

Arborman wrote:
3/ And advice on damage to look for ( As apart from it being loose, none noted?)

As Ric said, this is what happened to mine a few years ago when it came loose,cracked the sidecasing

and left a bit of a circle on the inside


But a bit of chemical metal on the sidecasing & 3 years later still going strong

same happened to me and I was convinced it was a seize. Upon taking the casing off you could see where the cap had temporarily welded itself to the casing giving the feeling of a piston seize.

Made sure cap was correctly located and torqued down and no further problems- not sure why it happened in the first place though.

Chris

It can happen to the best of us.
It will feel like an engine seize, because if you stretch your mind, effectively it has 'seized the engine' - prevented it from turning over that is.
As others have posted, make sure your splined 'drive assembly washer' as it is called on the Scooter Restorations website, has engaged properly.
When you are tightening up/pulling down the 14 mm bolt head, tap this washer lightly as this assists the engagement of it.
As a person who regularly has his crankcase side off (sprinter engine), one thing that you can do to spot errant cranshaft bolts removing themselves is to spray the inside of your crankcase with some rattly can paint, in my case, red - Vauxhall Corsa.
In this way you can sometimes spot/catch the problem before its too late by noticing any light marking etc on crankcase side.
Obviously this was too late for Dave Tomo...............
Don't scrap it.JB Weld it

Hope you get it sorted out.
Mr Tucky

Thanks for your responses ..... I have now tightened it back onto the crown nut etc...someone mentioned "torqued" down? Is there a correct setting or as tight as you can get it, without over doing it of course

This is my first bike again for a long time now(may well have gone in a bit deep with this RB it's a bit of an animal) and how impressed I am with engine development etc..
Once again thanks for your help..