Noise at low revs

[phil mcglassup]

How low in the rev range should a Fazer accelerate from while still running smooth ?

I notice that with my recently acquired bike that when I try to accelerate from approximately 1500 rpm there is a clanking /clattering noise from the engine and power delivery is very rough through the drivetrain with vibes through the bike. When this happens I just drop a gear to increase engine speed and then it's smooth all the way up the rev range. The bike has only done 15k miles but has no service history. It's like the sound of changing gear in an old large agricultural or industrial machine which doesn't have synchros !! It feels like the flywheel is too light to keep the engine running smoothly at very low revs.

I know modern machines like to rev, so maybe it's my fault, but other bikes have had have been a (little bit) smoother at very low revs. I haven't checked anything on the bike as yet.

Any thoughts ?

[Fazerider]

Yes, it is your fault. The engine is designed to rev.
Lugging the engine, which is what you're doing by overloading the engine at low revs is actually harmful. The main and conrod bearings are plain and lubrication relies on the parts moving past each other quickly (called hydrodynamic lubrication), a high load at low speed means the film strength won't be sufficient to stop metal to metal contact.
Change down. Get at least 4000 rpm if you intend to accelerate, more if you want to accelerate hard.

[phil mcglassup]

Thanks, I knew it would be my fault