This "jerking" of your bike when you get it to run with fuel starvation - up to complete starvation and shutting down, IS prejudicial to your bike, yes.
The lean fuel-air mix that you will have does not have the time to burn your valves, oh no!, but the shocks you give to your transmission will cause damages. First to suffer are the rubber cylinders that act as shock absorbent (that kind of shock) inside your clutch mechanism. Second will be the chain. Third will be another set of rubber blocks that also act as shock absorbing and are located between the rear sprocket and rear wheel. To a minor extend, the whole transmission will be affected. Ultimately, since your engine will have short, sudden bursts of power while it has also gone down low in rpm, hence having less lubrication, it could be damageable to your crank/ conrod.
You will not, with a Constant Velocity carb. like the one fitted on the FZ, be able to manually impose such violent shocks by sudden accelerations. Only the sport and trail bikes, with direct opening of the slide, can do this, and not even as violently since the quantity of fuel admitted is depending on the venturi (aspiration) inside the carburetor when the slide and the needle go up, while with this fuel starvation, it receives sudden "injection" of fuel.
You are savvy on fuel, Vimal, but I am afraid than doing so you will end up spending more in the end.....
....My two cents....



...nd i am not crying over fuel efficiency.....just checking is it returning me the same mileage as others are getting...if not then i may have to do some corrective measure.........cool down buddy.....we all r part of Yamaha family.....




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