27-10-12, 10:38 AM
The Ivans kit doesn't improve fuel economy and fitting it for that sole purpose would be a mistake. If you read the information about the kit on Ivans site you will see that he clearly states that Yamaha compromised on performance for reasons of fuel economy (and emissions) and his kit is purely designed around performance without these constraints.
As VNA comments the kit does enable you to potter around at low revs as the fuelling has been improved enabling the bike to be more usable across the range, and the enevitable result of using less revs is less fuel consumption (I can get 55MPG if I try hard). However this is a performance product designed to extract the full potential of the engine at all revs and riding around at 4k everywhere greatly misses the point. An Ivanised engine whilst happy at low revs does encourage you to explore the upper reaches of the rev range an experience which is usually rewarded with a huge dollop of arenaline and a fat grin, something that you will want to repeat again and again, until your fuel light comes on after 120 miles and you're reminded that nothing this good comes without a price. I must admit that as finances get tighter and the opportunities to fill the bike up get fewer I do sometimes question whether having the bike ivanised was the right decision as I've personally seen about a 10% drop in fuel economy on like-for-like riding, but then I wind the throttle back, pupils start to dilate, the smile becomes a grin and I know .......................
As VNA comments the kit does enable you to potter around at low revs as the fuelling has been improved enabling the bike to be more usable across the range, and the enevitable result of using less revs is less fuel consumption (I can get 55MPG if I try hard). However this is a performance product designed to extract the full potential of the engine at all revs and riding around at 4k everywhere greatly misses the point. An Ivanised engine whilst happy at low revs does encourage you to explore the upper reaches of the rev range an experience which is usually rewarded with a huge dollop of arenaline and a fat grin, something that you will want to repeat again and again, until your fuel light comes on after 120 miles and you're reminded that nothing this good comes without a price. I must admit that as finances get tighter and the opportunities to fill the bike up get fewer I do sometimes question whether having the bike ivanised was the right decision as I've personally seen about a 10% drop in fuel economy on like-for-like riding, but then I wind the throttle back, pupils start to dilate, the smile becomes a grin and I know .......................