My bike is terminal (too expensive to repair)

[Grendel]

Yes apparently it's the splines that are worn so the sprocket has free movement on the drive shaft.

[BobA]

I'm sure Stumpyfingers has a spare engine, dunno if it's for sale though

If you decide to weld the front sprocket on, MAKE SURE you weld a new one on, and that it is on the right way round!!!



Bob

[StumpyFingers]

I'm sure Stumpyfingers has a spare engine, dunno if it's for sale though

If you decide to weld the front sprocket on, MAKE SURE you weld a new one on, and that it is on the right way round!!!



Bob

If you ask kindly, who knows?

[Grendel]

Aparently the garage did fit a new front sprocket. Friend just got back to me he has Mig welder not Arc. What do i need to take off besides the cover to put spot welds onto the socket/shaft?

Althogh somone else is on about liquid metal?

[Grendel]

Well decided to have a look and took pictures. It appears the front sprocket retainer thing has been put on wrong by last owner last so rather than lining it up properly with the sprocket holes they must of forced it on over the splines then bolted it down resulting in wearing the splines out. The Sprocket itself fits nicely if pushed back but since the retainer is loose due to no splines the sprocket soon moves out and wobbles around by 2-4mm. So could I take the retainer off put a weld around it then bolt it back over or can you get some sort of sprocket washers?

[pdsquire]

(Mine was welded on for several months before it pinged off at the end of a fast, long day, two up, with full luggage and I discovered the truth. It was welded back by a bored Saffa for a week, then by an intense young Polish man who did a beautiful job and I didn't worry about it again.

Because of the danger of buggering the oil seal I'd avoid Doing It Yourself but put it in the hands of a garage you trust. The fact that the first thing the Polish bloke's boss said to me was that there was a chance the seal would be damaged gave me confidence they knew what they were doing.

Good luck.)


Having now looked at the pics, I think your garagiste may have been too gloomy. The splines themselves look OK and as I doubt you're going to be ragging it like a sports-bike, adequate to the task provided the sprocket sits in the right place (see posts below). Dunno what he meant about the rear sprocket though.

[BobA]

Grendel

I think I can see what the problem was caused by.

My personal opinion is that the sprocket that was removed was fitted the wrong way round, so the nice flange you correctly see on the outside of the new sprocket, was fitted inwards with the old sprocket. I think what happens when the sprocket is the wrong way round is, the chain is always trying to align the front and rear sprockets, so in effect, the chain would place a sideways force on the front sprocket and this causes it (or the retainer plate) to chew up the shaft.

I would avoid welding for now, as once you've done it, you're stuck with it.

Looking at that output shaft, I'd say it does have a bit more life left in it, but you will need to secure the sprocket somehow. I'm not sure, but would fitting TWO retainer plates (sandwiched together) put the sprocket in the right place on the shaft I wonder????? Worth a try for the couple of quid it would cost I reckon??

In theory, the retainer plate sits in a recess machined into the splined shaft, that is slightly wider than the plate. This allows slight lateral movement of the sprocket. The recess on your shaft is now much wider, but as long as there is enough good surface left on the shaft for the sprocket, all you really need to do is make sure it aligns properly. Is the damage to the shaft about the width of two retainers I wonder? As long as the outer surface of the retainer is in close proximity to the rear of the outer splines, the sprocket SHOULD be roughly in the right place on the shaft.

I hope that is clear, it is SO hard to describe what I actually mean!



Bob

[phil w]

You could also do the great saver on the DRZs that is advised an that is red loctite your front sprocket on the shaft to minimise movement. Dont know if it would help, but just a thought.

[Grendel]

I was thinking of going the 2x new retainer plates problem is Wemoto are out of stock at present anywhere else i could get them besides David Silvers and there silly prices?

If i get a chance i'll take off the sprocket and have a proper look at the shaft tommorrow.

[piguglyshandydrinker]

I'm pretty sure that the retainers are quite cheap from Honda.

It's normally the splines that drives the sprocket that wear & give grief, I'd go with Bobs suggestion (by the way BOB WTF has happened to your avatar again - I've mentioned this to you before!) of fitting 2 retainers if they will fit, if not just fit 1, a bit of sideways movement is normal & as long as there is enough spline there to keep the retainer, all should be well.

Phil