Primary needs

[Greybeard]

Today I've had the opportunity and motivation to work in my very hot oven shed. Have I mentioned that in the UK we are having a very unusually hot summer?

I last used my bike to do a BSAOC weekend. I noticed while I was away that I had a leak from the Primary case, so today. I took the cover off and found the inside as dry as a witches tit! The chain is knackered for sure. I can probably buy a new duplex chain. More worrying is the Clutch Chainwheel, (67-3271) which feels rather hooked. I'll put a Wanted Ad in the appropriate place but has anyone got anything useful to say about this? Can I try to smooth off the hooking with a file?

[RogerSB]

Hi GB, in my humble opinion you'd be best replacing the chainwheel cos if it's not right it'll quickly destroy your newly purchased chain  , as will the hooked one if you leave it.

[Greybeard]

Hi GB, in my humble opinion you'd be best replacing the chainwheel cos if it's not right it'll quickly destroy your newly purchased chain  , as will the hooked one if you leave it.

I understand that the hooked clutch sprocket will knacker the new chain. I'm having trouble with your post Roger; you seem to be referring to two items. The engine sprocket is ok. Is that what you mean when you say chainwheel? 

[RogerSB]

Is that what you mean when you say chainwheel? 

Not engine sprocket, what you referred to - the clutch chainwheel.

I was referring to your question about smoothing off the hooks with a file on your hooked one - but probably didn't make myself very clear.

[muskrat]

Crikey GB, you run over any chinamen lately?
The primary doesn't hold much oil so if a leak is detected it should be checked quickly. Must have been dry for a while to knacker the chain and chainwheel. The adjusting slipper would look a bit 2nd hand as well. This running dry would produce enough heat to do the damage. May I suggest my nylon slipper mod when your putting it all back together. The DeGroot one looks good.
Cheers

[duTch]

 That's a bit crazy GB- surely you can't have forgotten to fill it after the rebuild- especially with indication of a leak, but you also Shirley would have noticed *that* much of a leak sooner..

 * sorry Shirley

[Greybeard]

Crikey GB, you run over any chinamen lately?
The primary doesn't hold much oil so if a leak is detected it should be checked quickly. Must have been dry for a while to knacker the chain and chainwheel. The adjusting slipper would look a bit 2nd hand as well. This running dry would produce enough heat to do the damage. May I suggest my nylon slipper mod when your putting it all back together. The DeGroot one looks good.
Cheers

I don't know why it leaked so badly; I've never had the primary leak, (much) before. I reckon I did maybe 400 miles after I put oil in the case. The weather was very hot over that time; maybe that helped the oil escape. I had replaced the seal behind the clutch. I suspect the leak was from one or more of the case screws, (the oil has stained the case below the screws). I'll have to remember to apply sealant to the screw heads when I put it back on. When I opened it, the inside of the case was dry and coated in red, (ATF) dust! Nasty! The tensioner is scored but looks usable. The engine sprocket looks ok. The chain is deffo stretched/knacked.

[Greybeard]

That's a bit crazy GB- surely you can't have forgotten to fill it after the rebuild- especially with indication of a leak, but you also Shirley would have noticed *that* much of a leak sooner..

I put oil in the case before I set off for South Wales. I saw some leakage but decided that it would last until I got home.

[kiwipom]

hi G.B. ( dry as a witches tit ) never heard of that one before, maybe time to change to `Belt Drive clutch` cheers

[Greybeard]

hi G.B. ( dry as a witches tit ) never heard of that one before,

It's a long time since that phrase has come into my head. It's a good one, eh?

maybe time to change to `Belt Drive clutch` cheers

Mm, maybe. I've just ordered a clutch sprocket/basket from De Groot. I've had no problems with the primary until this!

[muskrat]

Unfortunately I don't think(that's normal) there's a belt drive setup for a plunger. BUT apparently a Notrun clutch will fit the plunger mainshaft and there's belt kits for them.
Cheers

[Greybeard]

Unfortunately I don't think(that's normal) there's a belt drive setup for a plunger. BUT apparently a Notrun clutch will fit the plunger mainshaft and there's belt kits for them.
Cheers

How would you tension the belt?

[RoyC]

hi G.B. ( dry as a witches tit ) never heard of that one before,

It's a long time since that phrase has come into my head. It's a good one, eh?

I've always said "flat as a witches tit" and dry as a kangaroos jock strap.

[duTch]

 

  Unfortunately I don't think(that's normal) there's a belt drive setup for a plunger. BUT apparently a Notrun clutch will fit the plunger mainshaft and there's belt kits for them.
Cheers

 Not sure which (particular) bit isn't normal, but yes a Noturn clutch centre will fit the shaft, but the chainwheel diameter is too big, so physically won't fit and the ratio would be crap anyway...I had one to play with but it seems to have gone awol 

 

....and there's belt kits for them...

 Belt drive kits for Plungers ??? yahoo, that'd be noithe.?....but.....$$$,$$$,$$$........

[muskrat]

G'day duTch.
Meaning there's a belt kit for Notrun clutches.The clutch on my Cafe is a Notrun diaphragm type with a center made for the s/a shaft. Haven't had to adjust it in 10 years of abuse.
GB, I'd suggest a new set of rollers as well.Cheers