Flappy lumpy chain and possible leaking gearbox output shaft

[coupcoup]

Hello,  As the title says i guess.. 


My new bike, a y2k 600, was making an odd noise occasionally, looking at the posts on here i deduced it was something to do with the chain.  So I took off the chain cover, destroying the gasket in the process, to find all manner of cak in there.  Loads of heavy oil and crud as well as a good few wee pebbles.  So I cleaned all the sheckter out, cleaned then lubed the chain(with muck off, good old halfords!) and gasket sealed the cover.  I sat the bike on it's centre stand and stuck it in first,  the chain started flapping about, jumping up and down, intermittently, but quite a lot more than i expected - like it had some sticky links, but it wasn't regular.  The play is ok and the chain seemed to be in good enough nick.  the sprocket nut is original and the bike has only done 6000 miles.  I rode it and it seemed fine. is it flapping just cause there is not enough  load.  oh, and do i have to replace the paper gasket or would gasket seal be ok?


while i was in there the output shaft looks like it might have a wee leak. Do I just pop the gasket and drift in a new one?  thanks in advance. 

[Dead Eye]

The chain flapping about is perfectly normal and nothing to worry about. With the wheel off the ground there isn't enough resistance so the wheel begins to briefly spin faster than the chain causing the chain to become loose, the wheel slows and the chain tightens and yanks the wheel forward again The gasket around the sprocket has absolutely no use what-so-ever in my opinion so I don't both replacing it at all.

Hopefully someone with better knowledge will be able to comment on the output shaft leak

[darrsi]

The chain pulls the unloaded wheel to the point where it simply builds up too much momentum but because the chain is in the way it stops it from going too fast, causing the jumping about.
It doesn't happen when the wheel is on the ground with weight on it.
The gasket is quite useless so don't be too concerned about that.

[coupcoup]

thanks guys!!  I'll save my chain and sprocket money for something else!!!

[Gnasher]

while i was in there the output shaft looks like it might have a wee leak. Do I just pop the gasket and drift in a new one?  thanks in advance.

 There isn't a gasket on the output shaft but rather an oil seal that can be removed and replaced.  Before you do go down that route give the sprocket area another really good clean this time take off the front sprocket really get every trace of the old spray on lub off.  Another really annoying trait this stuff has is that once cleaned it softens and turns back to oil and over a period of days it starts to run giving the appearance of an oil leak.  It's even worse when owners fit a Scott oiler the stuff just keep running and running and running for months and months.      Get EVERY bit of it off it can take quite a while off scraping, rubbing and jet washing but it's worth it, don't aim the jet wash directly at the output shaft oil seal.  Once thoroughly cleaned you will then be able to see if the oil seal is leaking or whether it's just the old chain lub running.   Then fit a Scott oiler       

[Raymy]

Wise Gnasher has spoken.

What he says...


My first fazer had (has) the same thing.

The chain rattles.  Its fine.
The sprocket cover gasket is not required. I used liquid stiff for a while but with checking the nut regularly it just becomes an inconvenience that has no bearing on anything overall. Leave it off and its fine.
The output seal is a bugger. I bought the seal online for a fiver and started a variety of conversations regarding it.
One technique I chatted to fazbaz about was with the engine and gearbox in place using a couple of self tapping screws to remove the old one and tap new one in with a equally dimensioned tube or cylinder.
Having done crankseals on engines in the past I always knew this would be very hit or miss with the end result and decided against it. Its a very fragile seal and wpuld meed the touch of an artist to achieve a solution but even then with questionable result.

The only alternative then is to split the box from the engine and do it the old fashioned, safer, way.

No.

In the end I weighed it up against the amount of oil I was losing as opposwd to the work involved and time my only mode of transport would be of the road as well as the facilities to carry it out at my disposal.
It didn't lose that much and with having the dreaded nut come loose previously I was regularly removing the cover for inspection anyway. Several times I tried to pull the shaft to see if the balls were loose (ooh err) and it was always solid.

I left it, it was fine. If you have the tech nous and the time and facilities, I say get the engine out and give it laldy. Otherwise,  it wont affect the bike overall unless the shaft is noticably out of sync or you are losing too much oil.
Aside from that it will be cushty

Hope that helps

[coupcoup]

nice one. thanks.  looks like its staying where it is then!!!