| Mines got a lightened flywheel as standard...and yes it can be a little lumpy at tickover due to reduced mass (and in my case lumpy cams!) and until it has been running for perhaps 10 mins it can stop on you when at tickover. Often catches me out at the first few junctions from my house! But once up to temp its fine.
Difficult to tell how quicly it spins up as it was fitted when I bought it...but it certainly does feel very free reving.
As for the comments about poor state of tune...I think it depends on the bike...if fitted to a Bip or S model then I think it should be able to run fine...with the R or SP(S) models, due to their higher engine specs (compression etc), they may become a little more vulnerable to the engine stopping etc when ticking over. | 
Hybrid Mode
