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The 650 Norton thread

Norton Models (not Commando or P11)

Re: The 650 Norton thread

Postby frankdamp » Wed Mar 29, 2017 8:27 am

One cautionary note, as I found this problem while riding my company-provided 650SS. The carburator slides are hand lapped to their individual bodies. They are NOT interchangeable between the carbs. If you've had both carbs apart without keeping track of which slide goes with which body, check for free movement by sliding them through their full travel to be sure they don't stick. One carb stuck wide open when you're trying to stop is exciting, but not fun!
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ex-Norton Villiers - Marston Road
Develpment & Competition Department
1967-68

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Re: The 650 Norton thread

Postby Triton Thrasher » Wed Mar 29, 2017 10:30 am

norton_rider wrote:Hi everyone, gonna do the first start up on the new carbs with the 650ss at weekend

quick question regarding setting the throttle stop screws for idle,

do you go in with them till you just see the slide move ever so slightly



or best going in all the way then back out a turn got about 1.5 turns of effect on the slide with them

premier concentrics


The horizontal pilot mixture screws are the ones you screw all the way in, then back out a turn and a half, as a starting point before you adjust them for best idle on a warm engine, as already said.

Screw the throttle stop screws in (upward) until they just touch the slides, then give them another full turn. Once the engine is warm, adjust them to the idle speed you want. You'll probably screw them in further than that first turn.
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