So... Are 35mm Keihin FCR carburetors too big (over carburetion) for old Norton 750 engine?
Not in my book.
Are they just cool looking add-ons with no real benefit over Amals? They are a lot more than just cool looking. Actually I think they are kind of ugly myself, but they sure do work right out of the box. Amals or Mikuni VM carburetors are not even close to working as well with quick throttle input.
Will the engine use more fuel? Definitely, but I didn't build my Norton for fuel economy. The pump shot isn't a big flood of fuel. It is enough to let a quicker throttle wheel work without hiccups
Will the power curve move up dramatically making the engine weak in the lower rpm range? I suspect the motor will make better power everywhere with the flat slide design and accelerator pumps based on what it sounds like. I haven't ridden it yet, but I do have a good ear for a tune.
The only issue I see with the FCRs is I'll need to upgrade the brakes.
Seriously though, they do have a lot of operational parts, and if I were riding a lot using the FCRs could raise the maintenance level on Norton ownership over the long haul. I don't put that many miles on my P11, so I'm not worried about it.
If you have the money, they are worth the cost of admission.
If you think small port heads and little Amal carburetors work better, ... good luck with that. See ya in my rear view. LOL
