Re: Disc brake conversion questions
Post the specs on you cam and maybe someone who has run the same or similar has some first hand experience with it and vacuum assisted power brakes.
Sorry, can't help with the little vs big booster, but just guessing, the bigger one would probably be more effective. You could always get shorter VCs unless you need tall to cover a shaft system. Of course your answer to the question above may make you decide to go to a manual brake system, which makes the booster question moot.
You could check the clearance on your drop spindles pretty easily. Bolt a hub and a steering arm onto the new spindle, bolt the wheel to it and have a look see. You can do this on the bench.
The vac port pass side front baseplate on your 650 DP is a good place to check engine vacuum. If you have a port in the front metering block pass side it shouldn't show vacuum at idle, only after the throttle blades are opened. Your carb should have a large port on the rear of the baseplate which is a good source for vacuum to the booster.
You could also use a 3" tall element in your filter housing to gain an inch of clearance if you need to.
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