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-   -   Surging...sorry ( https://www.xt660.com/showthread.php?t=9358)

tripletom 25-02-09 21:36

Just a post-note to say that the bike feels better post chain adjustment. It didn't need much, literally one swing of the spanner.

JMo 25-02-09 22:06

Quote:

Originally Posted by deiaccord (Post 83848)
Anyway, turns out it was just my chain getting too loose! The manual specs have the chain a lot looser than on other bikes (confirmed by my mechanic) and after having it serviced by my dealer the setting they used was just loose enough to give this effect after my 6000 service. I tightened it myself afterwards by a small amount (once accessable twist on the adjusting nut with a spanner) and it was enough to get rid of this effect...

...It is particuarly noticable on a low constant throttle (30 mph in 3rd particuarly) which seems to be what you've had, and results in the bike jerking around a lot and a delay in takeup of speen when you open the throttle.

No eggs here - I too have had similar 'problems' - at first I thought it was the crappy 85 octane fuel here in the US (actually I try to use super the whole time, but that's only 91, or 93 in Florida)... however, looking at the state of my cush drive now (it's pretty shagged), I too would say it is more to do with driveline snatch than actual fueling itself - 30mph in 3rd is pretty low revs, so the inherant lumpness of a single at low revs is going to exaggerated through a loose drive line, my chain/sprockets are fine, but I can rotate my cush drive a good quarter of an inch when it's stationary... time for new rubbers when I get home...

xxx

Peatbog 25-02-09 22:58

Quote:

Originally Posted by deiaccord (Post 83848)
The chain should just be able to touch the swingarm if you push it up (without having to press too firmly)

with the bike on the sidestand or centrestand?

Thanks
Pete

Gas_Up_Lets_Go 26-02-09 08:44

Quote:

Originally Posted by JMo (Post 84012)
I too have had similar 'problems'

....... however, looking at the state of my cush drive now (it's pretty shagged), I too would say it is more to do with driveline snatch than actual fueling itself - 30mph in 3rd is pretty low revs, so the inherant lumpness of a single at low revs is going to exaggerated through a loose drive line, my chain/sprockets are fine, but I can rotate my cush drive a good quarter of an inch when it's stationary... time for new rubbers when I get home...

xxx

I was delaying adding to this thread, as I've been getting a 'lumpyness' of late. I was pretty sure it must be wear somewhere as It's been getting progressivly worse.

My chain tension is fine, thanks to the Scottoiler (apart from when the new tyre went on it's needed no adjustment at all in 10,500 miles) but the slack in the cush rubbers is about 10 -15mm, or 1/2-3/4 inch. I ordered some new ones earlier in the week.

JMo has summed up the problem perfectly. Funny though, as the TTR hasn't had any such problem with the cush rubbers and it get's a whole load more abuse!

deiaccord 26-02-09 14:10

Quote:

Originally Posted by Peatbog (Post 84026)
with the bike on the sidestand or centrestand?

Thanks
Pete

Centrestand, or paddock stand (if you have one) as it takes the weight off the suspension. At least that's how I have done it. It also makes things MUCH easier for rotating the back wheel to check tension all over the chain.

Would people be all that interested in some pictures or a video of this? (There are general videos about adjusting your chain on youtube but the slack amount they show are far too tight for the tenere)

tripletom 26-02-09 14:42

Interesting. I always set my slack with me sat on the bike. I found that if I set it on the sidestand, as soon as the bike was off the sidestand the suspension sag eliminated almost all the slack, and once I was on it was tight. I know that for long travel suspension more slack is needed than a normal bike.

edit to add- the paddock stand WON'T take the weight off your suspension like a centre stand, as it locates on the swinging arm so immediately the weight of the bike is acting through the suspension.

deiaccord 26-02-09 14:49

Quote:

Originally Posted by tripletom (Post 84080)
Interesting. I always set my slack with me sat on the bike. I found that if I set it on the sidestand, as soon as the bike was off the sidestand the suspension sag eliminated almost all the slack, and once I was on it was tight. I know that for long travel suspension more slack is needed than a normal bike.

edit to add- the paddock stand WON'T take the weight off your suspension like a centre stand, as it locates on the swinging arm so immediately the weight of the bike is acting through the suspension.

The official manual gives figures with it adjusted on the sidestand.

Ultimatly it does not matter how you set the slack as long as it is correctly adjusted so I will be taking my dealer recommendation as a basis and then making the actual adjustments on the centrestand as that's easiest.

tripletom 26-02-09 15:20

Quote:

Originally Posted by deiaccord (Post 84082)
The official manual gives figures with it adjusted on the sidestand.

Yeah I noticed that too and was surprised

JMo 26-02-09 16:31

Quote:

Originally Posted by Gas_Up_Lets_Go (Post 84054)
Funny though, as the TTR hasn't had any such problem with the cush rubbers and it get's a whole load more abuse!

Without wanting to sound all techno-nerdy, that's probably to do with torque loading/power pulses from a big 660 single cylinder vs. a 250... there is much more torque in the Tenere of course...

xxx

tripletom 26-02-09 16:38

If I may be so contradictory JMo ;) my DR600 had no problems with cush drive rubbers and is listed as same bhp as the Ten. It is 50kg lighter though.


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