are you telling me I need to fork out £280 on a power commander to make it ride in a seine manner?
will this not also spoil the fuel economy?
I thought they fixed the ECU in the later years?
It's a used bike, no telling what is off
as it sits and you rode it. Not knowing the reputation of the dealer you are visiting, but in my experience, most dealers are lazy for trade-in's: just make sure oil level is in the window, there is some air in the tires and the most of their effort goes into having the least paid person there wipe it with polish.
- They suspect the chain/sprockets are worn, if there are kinked sections or it's out of adjustment and worn as well, it will ride like it's an antique crap pile.
- Did they verify fuel injectors are synchronized?
- Did they verify the rear fuel injector is still fully seated within the rear cylinder head boot? They can pop out if the clamp isn't tight and the bike has had an intake hiccup. I'll bet the dealer's not even aware of this sort of issue.
- Do they know for fact whether the airfilter was ever replaced as prescribed in the owners manual? When was the last time it was inspected and the bugs and bits brushed away? Do they know for certain the airbox is properly seated, bottom to top with the airfilter gasket?
That's the quick easy list. I bought a stock 2006 from the original owner last year and even as meticulously as he cared for it, I found the sync to be out a bit and the rear injector loose in the mounting boot. I fixed those, a nice improvement in overall smoothness and there was no surging as you describe.
I did add a Power Commander and devised my own map based on other maps I studied for the Vee and maps I had created for past bikes like the 954RR Blade, Hayabusa and ZX12R. It runs absolutely tip-top and my fuel economy is still a true 39-41mpg in the city, with healthy applications of throttle.
I also went up 2 teeth on the rear sprocket. As delivered from the factory, it's not unlike the long legged gearing of a Hayabusa, fairly absurd on a bike with 1/2 the power. This alone made a very noticeable change in how the bike performed and in reality, I would go up 3 in back without hesitation the next time.
So, really, you need to evaluate the bike as it sits and try to determine whether what you experienced is due primarily due to maintenance issues and how much better would it be once these things are addressed.