Hitchcocks Forum

But it's all part of the fun? I was refitting the primary drive on the Series 2 Interceptor project after rebuilding the gearbox as I wasn't happy with it, when I found that the clutch basket locked solid when I did up the clutch centre nut. The gearbox sprocket lock nut shoulder is too deep where it enters the chaincase and will need turning down. Part of the fine tuning needed when fitting non standard parts, in this case belt drive. Once I worked that out I realised the clutch basket was oscillating when rotated, too much to ignore. I think the mainshaft is bent, probably dropped during the time the bike was a basket case. I have found another shaft after a bit of hunting about, although it was in a box I bought as a Bullet one so at least that's a bonus! As I didn't want to start pulling the gearbox apart late in the day I thought I'd clean the timing cover up prior to polishing. What's this? Someone has had to drill out the timing cover allen screws and 3 of them have the remains of the shoulders still in the holes. I hope I can get them out but that's a job for tomorrow. Appropriately the Doombar was a good reward in the pub!

REgards, Mark

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I used to frequent one of the Firkin breweries pubs near the Angle Islington for a while. They had a beer call DOG BOLTER, with a fuzzy looking beer mat. When the beer mat began to look normal, then you had usually had enough and it was time to leave.

Hi Mark,
I found that our Host's replacement sprocket nuts will not allow the grub screw to fit without filing a small semi-circle in the nut's flat. Have you found the same? It is a little annoying but actually allows a firmer fixing of the grub screw. No way can the nut turn once the screw is 'in the groove'.

I also have an S2 Primary outer case fitted to an SIA here, but I'm afraid it was damage-repaired & will now not fit with both dowels in place, otherwise would have offered a swap.

A bent mainshaft eh? Sure it's not wear on the shoulders where the old clutch collar sat? Did it require a collar at all? Just fitted BNR clutch with chain drive, no collar required - in fact I had to get Allan to machine 1/16 off the clutch rear in order to line up.
TTFN Jack

Firkin Brewery and Dogbolter, memories of working (and drinking) around London in happer times
When I discovered sense I buggered off back to my roots away the insanity & forgot all abut the Firkin pubs.
Wondering what became of them I did a google thing and found they are long gone - http://www.goodbeergoodpubs.co.uk/artic ... rkin-pubs/

I got the drilled out heads out of the cover this morning by heating the cover to 250c in the workshop oven, inserting a plug tap into the remains of the heads and tapping the cover away from the tap (held by Molegrips) with a nylon hammer. Pleased with that! Jack, no the mainshaft is actually slightly bent, with clutch on shaft there is about 1/8" runout, too much to ignore. The clutch body (centre) fouls the sprocket nut where it comes through the seal on the case, I found a good s/h one which is significantly shorter and I'll use that. I know what you mean about the grubscrew, this one was ok on a British made Talon sprocket but I have had this on other builds with unknown sprockets. Thanks for the chaincase offer, I may take you up on that, as it's got belt drive a perfect seal is not needed but the chance to strobe it will be! Bryan, the Firkin pubs came about in darker times when it was getting very hard to find decent ale in much of London but though they started independent they were soon swallowed up by a chain and it all went downhill. We had one round the corner when I lived there and it made a change from Young's which I actually preferred then and now! The writing was on the wall when I found a Firkin pub in Amsterdam (I was working there) and the beer was awful although the locals seemed to like it!!

REgards, Mark

Hi Mark, the grub screw bodge was required when fitting two new nuts on two new Talon 21T Inter sprockets from our Host. This chaincase holds oil OK, just had a lot of repairs & will not fit with the upper locating dowel in place. Slight distortion. Fitted to SIA #981 at the moment. I had plans to fit the timing gubbins, but it would not adapt to 200W alternator (only 3 fixing holes instead of 6, so the timing plate only had 1 hole to fix to). Might be OK for you, but didn't feel it was a fair swap. Up to you to see, if you fail to find one elsewhere. I'm not sentimental about this cover, it is an early one with the timing hole added/welded at the works. TTFN Jack

Thanks Cleggy, I will get back to you on this. I have replaced the gearbox mainshaft, not too hard to do with the box in the frame, and the runout is gone. Kickstart is jamming now but I'll fix that tomorrow.

REgards, Mark

Aye, an easy job to change the mainshaft on these boxes, harder to extract the gear & dog & replace I would say; unless you have a slack fitting set, which I do hope not. It's a wonder it fitted through the sleeve gear. Best label the bent one eh? TTFN Jack