What goes in this hole then?

[chaterlea25]

Hi Richard,
Many thanks for the great photos and info,
I looked and photographed a secondhand "Pearson" clutch at the Founders Day Show and autojumble in the UK this year,
He makes the chain wheel and basket as one piece, however it must have been running well out of line as there was a fair amount of wear on the sprocket!!! At £270 I felt I could do better!
There also seemed to be some fretting between the steel centre adaptor and the alloy clutch inner
I paid £40 for a complete Suzuki clutch and £30 for almost a complete other including a second Basket

Do you know the bearing number for the centre bearing on your clutches?

Attached are some photos of the Pearson clutch for comparison, this one has a modified centre As Mr Pearson sells a seal kit for the sliding plate.
It will be a couple of months before I get to this project as I am building another garage, I cant even walk around the bikes at the minute
I am taking early retirement before the year end, this should allow lots more time to play in the workshop
.

Regards
John O R

[Mosin]

Well, I was beginning to think that the day would never come....

But yesterday my new piston rings arrived (the correct size this time) and the barrells slid on just fine using the clamps. My rebuilt Cylinder Head went on next no problem followed by rocker box, exhausts, carb, sump plate and tank. This morning I put some fresh oil in her kicked her over and she fired! Initially there was quite a bit of white smoke coming from the left pipe (same one as before) and my heart sank. But after a couple of minutes, this dissapeared and the engine settled down to a nice tick over with the oil pumping through at a very healthy rate. I went for  couple of short runs and noticed that the engine seemed to be running quite hot and is reluctant to start again from hot, even though it starts from cold just fine. Aside from this, I have now covered about 12 miles and everything else seems to be ok. Tonight I have removed the sump plug and all that drained out was the egg-cup or so of oil that you would expect. A good result.

Thanks again for the help, support and encouragement guys. Without this forum I would have given up long ago.

Simon

[nigeldtr]

Hi simon,

Great news - have you checked th eignition timing?

Nigel

[Mosin]

Hi simon,

Great news - have you checked th eignition timing?

Nigel

I haven't, but I have never touched the timing throughout all of this. Is it likely to need resetting?

[A10Boy]

Simon
Well done. I love it when a plan comes together. 

One thing, you might find that the engine needs slightly different carb settings after a rebuild

[nigeldtr]

Simon,
I only mentioned the ignition timing as I had a similar failure on my A10 and when it failed it was very hot. When I put things back together, I decided to check the timing and found it to be advanced, which if I am correct, gives much higher combustion temperatures.

Nigel

[Mosin]

I've had a tinker with the carb and re-re-set the valve clearences. It's running much better now! Still a bit harder to start from warm, but not too bad. I've done twenty five miles on it this afternoon with a grin on my face for every single one of them!

[rocket man]

well done mate 

[Mosin]

I am sure that opinions will differ widely on this subject, but I wonder what people would suggest as being a suitable "running-in" period for my newly rebuilt engine? I have now covered about 100 miles on it, very carefully, and it is still running beautifully with no smoke or overheating and just a nice stady purr...

[rocket man]

id say run her in for another 500 miles say half throttle
then slowly increase your speed after that you have to be
gentle with an old bike im still running mine in ive done about
300 miles now i ride at 55 miles an hour which i think is a good
speed for her when i reach 600 miles i will be riding her at about 65
which is the fastest i will be going on the old girl

[Rocket Racer]

Can you tell me any more about the source of these sprockets? I enquired with my usual blank sprocket supplier and they couldnt do a 428 43T sprocket, nothing smaller than 46 Teeth...
The picture shows what looks a fair bit wider than a single sprocket.





He buys industrial chain wheels, and adapts the clutch to them. This one is steel sprocket.

 

[chaterlea25]

Hi Rocket Racer,
I have bought some correct sized 43tooth blank sprockets  from Sprockets unlimited in the UK,

www.sprocketsunlimited.com/

they have them in steel or Dural, 16 and18 £. +vat

HTH
John O R

[Rocket Racer]

Thanks for that, I have been in touch with them and have one ordered. Then just need to sort out a bearing and a centre...

[BSA_54A10]

You can do the same thing with a Yamaha SR , XT , XS clutch.
These are all rivited to the driven gear behind them so they can be drilled out and bolted inside the existing BSA clutch drum.
The center of the Yamaha clutch is bigger than the BSA one so it can be machined out to fit over the BSA one.
I am sure that there are a lot of other ones that could be made to fit in a similar mannar.

OTOH it is a lot simpler to buy an off the shelf Triumph conversion to take the Triumph ( and latter BSA ) 3 spring clutch, fit an alloy pressure plate and top hat radial roller lifter

[Big Nick]

looks like a home made breather to me as well. i also have adapted the rear inspection cover to add breather pipe