Surging
 

After getting my Ten dyno'd the before run the tuner noted the surging and commented that the engine was lean and the surge was due to lack of fuel. So if this is the case for you it wont go away anytime soon unless you get some sort of fuel mapping done. And I suppose air temp/humidity will affect also as that can change the air/fuel mix too.

My bike doesn't surge any more after the dyno and custom mapping.

Only answer is get it custom mapped or put up with it I'm afraid.

As Kev said the O2 sensor and EFI thats leaning out the mixture and giving you the surge. Its not the transmission thats a different type of sloppy feeling.

Almost all of mine was transmission/uneven chair stretch related (caused by all my winter riding it seems).

As for fixing a lean mixture would not increacing the idle speed a smidgen also help here as I believe it increaces fueling across the board?

It's only a problem at constant speed/throttle anyway, I've never had any problems when accelerating. Decelerating problems were chain snatch related.

Exactly, that is the bike running lean.

Adjusting idle speed will only adjust idle speed it will not change fuelling through rev range.

I just like other Ten owners thought my bike ran smooth, although I did notice the surge. But its only after I got it mapped I noticed how much better it has become. I guess its difficult to convince someone that thinks their bike is running very smooth that maybe the fuelling isnt as good as it could be.

There's always room for improvement. Often the question is 'is it adaquate' however?

I'd like to get mine done oneday, just not too many other things competing for my money!

Believe me I get your point, my pocket is still hurting!

On a lighter note, you lot want to experience a 172HP 996S and then complain about surging........:laughing7:
Rolling on and off the throttle it was like a bucking bronko, made for allot of fun trying to negotiate roundabouts in the wet.

Got pulled over by a solo police officer (UK Bike Police) who had been following me down the M4 to london for a few miles, I was doing slightly over the limit and expected him to pull me, anyway just as expected he pulled me over but instead of the usual lecture of going too quick he started to have a go at me about that either I had left my hazard warning lights on and made no attempt to turn them off or I had a wiring fault causing them to keep coming on, I let him go on at me for a few mins before I explained that the bike didn't have a hazard warning light switch and that as far as I was aware the flasher unit wasn't capable of indicating all four indicators, anyway he checked the bike over and then said he would follow me for a while longer and keep a close eye on it, couple of miles further he pulled me over again this time to give me a lecture on why it isn't clever riding a bike that spits flames out the exhausts............. Spoil sport. Looked cool at night though.

So I think it's possible that all EFI large cylinder bikes are prone to surging to some degree, in my case it was extreme but then I had a highly tuned engine and ECU to match, fuel economy wasn't a consideration as the bloody thing probably burnt more fuel outside the engine than in, not to mention it ate chains, sprockets and tyres and barely covered 75 miles on tank if I drove it like a granny (No offense to Grannies). If you want to see some pics of the beasty see here -

www.facebook.com/album.php aid=16928&id=671243295&l=3cdc62a900

i have had a few XT's now, the first XTX was bad, jumping and surging all over, it had arrow cans on it. put the standard cans back and smoothed it right out (not fully)
then and 09 XTX, this was sort of fine with surging but not as bad as the 05 one, i put a set of Leo Vince cans on it and it was bad.... surging all over, put the OEM cans back and fine again... the XTZ i now have is standard and smooth, really smooth. as much as power is nice i am thinking standard cans seem to work better. I like the Akro cans from Yamaha and think the cat in them is a good idea as they are designed to run with one....

i maybe way off but i have noticed the surging is worse after a can change.... if it aint broke, dont fix it :-)

If you added a fuelling device with those mods it would have smoothed your bikes out.

Hee hee - I was wondering when Kev would come along and say that x

Certainly running a Power Commander (set up on a dyno) together with my stage 2 airbox lid, DNA filter and the SR single race can has made a huge difference to the way the power is delivered, and has released a useful few more horses too...

The bike is dead smooth, and really pulls from 4000-7000rpm now, in fact it will hit the limiter before you know it! Yet it will still trickle off the throttle for slow speed riding too - it really is excellent!

Of course it has been well documented that the stock Tenere fueling is vastly superior to the older generation XTR/X, but as Kev says, if you are going to start playing around with the air/fuel in and out on any of the XT660s, then the stock ECU really needs some help...

xxx