CND 850SF - recognise the throttle/switches?

The crank is built up using an original SFC center piece, inner webs from a triple and lightened SF outer webs. Interestingly, the R/H cylinder is running lean on mine too, was hoping that the cause of it was also responsible for the vibrating. Still learning how the Mikunis work so maybe some improvement can be made there too.

Marnix

 

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Well Vince, I'm not impressed either.. had to pay for servicing forks that were in perfect order when I brought them.  :(
 
Fascinating discussion...great looking bike! Was that from Made in Italy? Pricey ...
Hey Phil , you need....a mudflap😁hoping to pick up my ss front guatd after a year at the painter tomorrow..the orange has to match the rest of the bike! Incidentally although not ridden really hard on a track, fastish road riding with a shortie guard on showed no difference in handling / brace effect.Also getting tyres for xt500  to loose wheels..jeez not sure how to get both out at same time though have a rear stand...back in the day had a milk crate!no hijack intended! Just call me Ron?😂
 
So the Maz 38mm forks on the Pantah needed some work and I expected a simple fix, seems they needed converting to Teflon bushes to remove the inbuilt friction. That discovery cost me $300 for the pull-down and reassemble and there exactly the same as before, waste of $300. Bush conversion $1000. I now know who does the required machining to do this conversion and it won't cost $1000 either. Maybe they're good at changing shims on modern forks but older stuff seems to mystify them with their crudity.
 
Hi Marnix I did my crank in my ex proddy racing 750 the same as yours - i did this to stop the splined version doing a 180? conversion as bike was running - happened to me on a test ride on a local road in the late eighties. I had a load of centre pins made and then realised the later SFC's had the same set-up. In fact my centre pins would fit the original SFC crank! quite a few owners have now gone down this road. I balanced mine statically to 65% as two separate "singles" on a set of knife edges made from old bedstead angle iron - bike is very smooth with some tingling at high RPM. - I had to add "Mallory Metal" to get extra weight to obtain the balance factor I wanted as i went a bit overboard with the lightening! - Regards - Phil
 
Previous owner bought it from Made in Italy. Couldn't deal with all the issues and just wanted to get rid of it..

Marnix
 
MarnixSFC said:
The crank is built up using an original SFC center piece, inner webs from a triple and lightened SF outer webs. Interestingly, the R/H cylinder is running lean on mine too, was hoping that the cause of it was also responsible for the vibrating. Still learning how the Mikunis work so maybe some improvement can be made there too.

Marnix
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Looks very nice, Marnix. Phil and I have exchanged a few emails about using triple webs, but they are hard to come by. My SFC crank is already ... an SFC crank ... so don't need to worry about anything but balance factor. My SF conversion will use stepped press-up (no spline) centres that Steve B created so we can use std SF centres without the risk of spline failures Phil mentioned. Fingers crossed it is a good solution.

Seems 270 cranks will be more common than 360s on the old twins (and the odd nexer ones) soon!!  :o :o :o
 
With the new strobe light I quickly discovered that the dual Boyer ignition was not advancing at all.

A previous owner had just set it up halfway between TDC and the max advance mark. He clearly had the wiring to the pick-ups wrong. When I swapped the wires leading to each pickup, the position where it sparks moved enormously so had to start with an approximate position. The engine fired right up and idled beautifully, better than it did before. The strobe showed the ignition was now advancing as it should, problem solved.

No need to say the engine transformed.. Idles perfectly, enormous increase of power in higher revs. Happiness!

In the big box of spares and documentation that came with the bike there was another pair of Boyer boxes, bet they are just fine..

Marnix
 
It's hard punishment for someone who thinks he has bought himself a machine that, based on the looks and description, can be expected to be an immaculate motorcycle.

Marnix
 
In the big box of spares and documentation that came with the bike there was another pair of Boyer boxes, bet they are just fine..
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I've got quite a few spares Marnix - are you running one magnet or two and do the pick-ups have the wiring separated? i found 6 boxes that were returned as faulty and all 6 are working fine. Palmelli runs one magnet and Pk's separated with 2 boxes to two single coils - only the early Bransden boxes will work with the Pk's separated. - Regards - Phil
 
Nick: did not have contact with previous owner, bought it from a trader..

Phil: one magnet, 2 pickups, each with their own separate wiring to the boxes. Decent setup, if connected properly.  ::)

Marnix

 
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