Harsh Reality Pics - The Black Museum

Wow. Is that on a 530?
Only like damage I've seen, although nowhere near as bad, has been on a 630 set up.
Yeah, a 530, Tom.
I can't, for the life of me, figure it out. That sprocket was the tightest I ever fitted.
Apart from being a bit vibey, I notice how much smoother it runs now, there was no real indication what was happening until it forced the sprocket outwards enough to rub the chainguard.
 
That on the 3C Hamish ? how many miles ? when i changed from the 630 on the Jota there was some decernible rotational play but not much - popped the new sprocket on and off we went
Yup, it'd been on for 20,000 miles.
TBH, despite being driven so far out of alignment, the DID 530 ZVM-X chain was still in good condition.
Modern chains are truly wonderful!
I remember trashing a new chain (Regina/Renolds, prolly) and sprocket set just going to Breganze and back, in '91.
 
Yup, it'd been on for 20,000 miles.
TBH, despite being driven so far out of alignment, the DID 530 ZVM-X chain was still in good condition.
Modern chains are truly wonderful!
I remember trashing a new chain (Regina/Renolds, prolly) and sprocket set just going to Breganze and back, in '91.
did you change the shaft ?
 
Bugger....
Lucky you found it Maurice (y)
Hope you just parked it up and grabbed another from the stable?
:)
 
Looking for something else, I came across this.
It's, apparently, much more likely to happen to those of us with overbored carbs but, as evidenced by the cracks and the witness marks on the edges of the bit that passed through the engine, without leaving a trace, routine examination would seem appropriate. Doing so would have saved me removing the cylinder head to check that no internal damage had been caused.IMG_3544.JPGIMG_3546.JPG
 
Ugly. So do you mean a std triple 32mm bored to 36mm? 32's and 36s share a common body casting, as do 38s and 40s, which means the smaller iterations tend to offer more support to the slide (because there's more metal there to support it around the through bore). My SF1 36 slides had those same wear marks - but worse - but I never had a piece come away like that.
 
Ugly. So do you mean a std triple 32mm bored to 36mm? 32's and 36s share a common body casting, as do 38s and 40s, which means the smaller iterations tend to offer more support to the slide (because there's more metal there to support it around the through bore). My SF1 36 slides had those same wear marks - but worse - but I never had a piece come away like that.
Mine was smoothbored to 35mm. I've had it happen twice. Second time on a replacement new slide only 19,000 miles old, in a different carb.
 
Think I've already mentioned I 'rebored' my 36s to get a clean bore, made bronze slides and had them hardchromed and ground to fit. No issues after that.
 
I've had slides bulge, but not break.
After 2 or 3 slide changes, the carb body is too far gone to warrant new slides. It would need sleeving.

Paul
 
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