Fed up of surging
 

I have done everything to my bike 2009 xt660r pipes dna stage 1 and 2 snorkel removed kevs mods 02 and fuel mod new chain sprockets new Cush drives and bearings oil and filter new plug and still surging 0-40 mph above that it's fine goes great my bike is in excellent condition done 7500 miles I'm gutted and getting sick of it it's a shame as I love my xt

Have you tried the twist grip (throttle) mod?

Surging
 

No not tried it never seen it how do you do it please lie try anything m8

Twist-grip mod: http://www.xt660.com/showthread.php?p=154983

Been there done that took Kevs mod off and fitted a PC mine doesn't surge.

Surging
 

How much did it cost for pc did you still have surging with keys mods on did the pc make a big difference

Only difference with mine I have the air box holes.

I took Kevs fuel mod off and bought a secondhand PC as much out of curiosity I found the surging you get is a like tooth when you have it can't stop poking and prodding!! I found the trick was to ride either on or off the throttle it didn't bother me all that much,but not something I think about at all now.

Re the PC just like everything else in life you only get what you pay for although I do run it with Akra's which having changed pipes not only on my XT but other bikes they are the best by the proverbial mile.

Surging
 

Hi guys been playing about over the weekend to try to sort out the surging I have all mods fitted so I ended up targeting the chain tension so took up a bit of the slack and it's made a big difference was just wondering do the xt like the chain to be quite tight

No, not really. Too loose and you'll notice slack/surge when taking up the throttle. Too tight is bad though. Can cause all sorts of woes and breakages.

One thing to consider is how old your chain is? Even adjusted correctly, an old knackered chain will cause sloppy take up of drive because of the small amount play at each roller/plate. A 110 tiny bits of play makes one hell of a big lot of slack when you take up drive!

If you've come from a road bike you'll feel the chain more as it runs looser than your average road bike. usually if the chain is causing surging symptoms i find it's usually ready for a good clean and adjustment.

I have found some bikes of the same model can be more fussy about chain tension than others.

The throttle mod is certainly recommended.

Try dropping the front sprocket 1 tooth.:newspaper:

I very rearly ride mine in slow town traffic...
But I find use lower gears keep the revs up...
high gear / low revs is when you get the worst
surging..

I run 14/48 gearing.... 4500rpm @100kmph
500 revs more than standard gearing..

have you ridden another xtr so that you can make comparisons?

singles power delivery is punch punch punch and never smooth

My 2005 xtr with -00 ECU had very strong surging problems and by strong I mean like riding a kangaroo, especially at 30 km/h. So what I did and what happened:

-Oil and filter service+NGK iridium spark plug+new cush drive rubbers+TPS replacment=70% better!!(I think new spark plug did most of the job, maybe it was broken?)

-DNA stage 1,2+removed snorkel+KEVs fuel mod(which arrived today, thanks KEV)+CO setting up by 10+tps set to 16+idle rpm set to 1500= additional 25% improvment.

Surging is now hardly noticable, actually i wouldn`t even notice it, if i wasnt paying atteniton :) and I can easily say the surging is actualy only 5% of the original surging maybe even less :) I`m very happy :D