650SS twin carb question

I had one like that. It's a very easy fix. Take off the side stand.

Cheers

Alan

Alan's right - use the centre stand. Inevitably, if the bike is leaning over when stationary, the mixture will go all to pot with a chopped carb, but still be OK on the road. The answer? Handed carbs or concentrics. Or remove the side stand.

Was the chopped monobloc used to achieve an appearance similar to the Domiracers?

hello it sounds to me like fuel shortage some were, the carburettors should be connected to gether by two banjos under the main jets . and tick over is controlled by the pilot jet so if the pilot jet is getting blocked or its not bigging enough so go to the next size . have you any bluing on the exhaust pipe . over advanced ignition and lean mixture

hope this help some along the line.

yours Anna J Dixon

How did Eric Oliver manage with sidecar racing with (presumably) twin monoblocks? (One alleged improvement with the Concentric was that it is less sensitive to sideways forces.)

You'd need to read up on what Eric Oliver was using. Back in the day I suspect a lot of racers used TT or GP carburetors.

Colin.

Previously wrote:

How did Eric Oliver manage with sidecar racing with (presumably) twin monoblocks? (One alleged improvement with the Concentric was that it is less sensitive to sideways forces.)

Anthony, I know what you are on about. My brief and carelessly expressed comment was about a speculation that Norton wanted their road bikes to look like the Domiracers and decided on a chopped monobloc as a quick, crude and cheap (ie typical 1960s Norton) to achieve parallel carbs on the downdraught head. I think Norton used the idea first but they also appeared on some of the AMC twins. The Triumph Bonnie had them for a time but Triumph did it properly and used a remote float chamber.

Alan

hello well you can all ways fit Gardner flat side carbs Like I had on My 99SS . It could do 135 MPH 6speed quaife gear box, 23 teeth on the Gear box 10.5.1 compression, 650ss head Special made bottom end and crankshaft built up all roll bearing crank six speed pump special made rods and camshaft. all made at doncaster locomotive workshops . a real caferacer

Doncaster locomotive workshops - so it was steam powered too then?

Anything worthwhile built at Doncaster Loco Works had 3 cylinders!

Not true, they built some 8Fs there....

Back in the 60s a friend of the old man had a BMW R69 with Steib chair that had been done in the paint shop at Horwich, Blackberry Black cycle parts, tank mudguards and chair body Brunswick Green with orange and black lining out, numberplates signwritten in 'straw', it looked fantastic, unfortunately it got scrapped.....

All very interesting, but, does it really matter? If the bike runs ok, on the road, what is the problem? The side stand is only used when parked.

My grandfather's next door neighbour laid a rather naff concrete path which had circles of pink concrete in it - 21" diameter. A3 piston rings could be seen embedded therein. However, my grandfather brought home a gallon of superheater oil for my dad's bike, a 680 Zenith. It got 30 miles before the big ends failed. False economy!