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.: XT660.com - The #1 XT660 Resource :. ( https://www.xt660.com/index.php)
-   Fuelling and Intake ( https://www.xt660.com/forumdisplay.php?f=207)
-   -   Kev O2 controller, my experience ( https://www.xt660.com/showthread.php?t=21242)

Eddiw 02-09-13 10:14
Quote:
Originally Posted by Kev (Post 191459)
Other things that cause surging are worn chain & sprockets, chain to loose not adjusted correctly & the most common one is the rear sprocket holder damper rubber with free play.

1/ Make 100% there is no free play in your rear sprocket holder, grab the rear sprocket & try & move it forwards & backwards there should be no free play. If there is free play replace the rubbers or carry out my rear sprocket rubber mod.

2/ Make sure your chain does not have tight spots, lift the rear wheel in the air supporting the bike with a stand or box so you can spin the rear wheel freely, turn the rear wheel slowly while pushing the underside of the chain upwards towards the swinging arm the chain should not change it's length or try & push your hand downwards, if your hand is forced downwards & upwards when turning the rear wheel your chain has tight spots & can make the bike feel like it is surging.

3/ If your bike chain has no tight spots & is adjusted to loose the bike will feel like it is surging.
Thank you, will do the tests on my bike :)

Eddiw 02-09-13 22:14
Quote:
Originally Posted by Kev (Post 191459)
Other things that cause surging are worn chain & sprockets, chain to loose not adjusted correctly & the most common one is the rear sprocket holder damper rubber with free play.

1/ Make 100% there is no free play in your rear sprocket holder, grab the rear sprocket & try & move it forwards & backwards there should be no free play. If there is free play replace the rubbers or carry out my rear sprocket rubber mod.

2/ Make sure your chain does not have tight spots, lift the rear wheel in the air supporting the bike with a stand or box so you can spin the rear wheel freely, turn the rear wheel slowly while pushing the underside of the chain upwards towards the swinging arm the chain should not change it's length or try & push your hand downwards, if your hand is forced downwards & upwards when turning the rear wheel your chain has tight spots & can make the bike feel like it is surging.

3/ If your bike chain has no tight spots & is adjusted to loose the bike will feel like it is surging.
Well Kev, you were right I think.. I had quite alot free play when I tried to move the rear sprocket forward and backwards.. The drive line are fine. Will fix the rubbers.. Is it ok to ride the bike with bad rubbers?

Kev 03-09-13 02:14
Quote:
Originally Posted by Eddiw (Post 191480)
Well Kev, you were right I think.. I had quite alot free play when I tried to move the rear sprocket forward and backwards.. The drive line are fine. Will fix the rubbers.. Is it ok to ride the bike with bad rubbers?
It is OK to ride with worn rubbers but not with rubbers that have broken up & they do break up over time, so check them as soon a possible the free play will make the bike feel like it is surging because of the free play.

Nissemanda 03-09-13 06:35
Nice to see so much life in this thread.

Im including new rubbers in my rear sprocket holder when doing service on the bike this autumn.
There is lots of play when moving the rear sprocket, I bet these rubbers have never been changed, bike is a 2008 with 19000km on it.

Anders

Eddiw 03-09-13 07:22
Quote:
Originally Posted by Nissemanda (Post 191492)
Nice to see so much life in this thread.

Im including new rubbers in my rear sprocket holder when doing service on the bike this autumn.
There is lots of play when moving the rear sprocket, I bet these rubbers have never been changed, bike is a 2008 with 19000km on it.

Anders
I will do that too :)
My bike is a 2007 and (almost) 12000km. Not so much for a 2007 but I don't think my have been changed either. Some say that they work for like 5000km, that is not very much.. I don't think it is that easy to check the condition on them, because you need to remove the whole wheel and disassemle the rear sprocket and sprocket holder to actually see the rubbers..

Anybody who knows where to buy the rubbers in Sweden?

Eddiw 03-09-13 16:54
Quote:
Originally Posted by Kev (Post 191487)
It is OK to ride with worn rubbers but not with rubbers that have broken up & they do break up over time, so check them as soon a possible the free play will make the bike feel like it is surging because of the free play.
One more stupid question... You said in an earlier post that I should try to move the rear sprocket forward and backwards. In which direction? :p
I pushed it towards and backwards from the wheel and i had some free play.. I did not push it in the direction it moves.. I think I did wrong, didn't I?

End of stupid questions ;)

Aidantausta 03-09-13 17:47
Tar det p� svenska, du ska ta tag i d�cket med en hand och med andra handen f�rs�ker du rucka drevet i sin rotationsriktning b�de fram�t och bak�t. Det ska inte glappa n�got.

My cruchdrive rubbers were bad with only 1200km on the gauge. I didnt have any real freeplay but with handforce i could move the spocket about 3-5mm in its rotating direction compressing the rubbers. Made the mod and its alot better now but I will buy new rubbers and replace them anyway.

Pleiades 03-09-13 19:32
Quote:
Originally Posted by Eddiw (Post 191506)
I pushed it towards and backwards from the wheel and i had some free play.. I did not push it in the direction it moves.. I think I did wrong, didn't I?
If you have rotational movement (turn the sprocket some way before the wheel moves and takes up drive) then the cush rubbers are worn. If you have lateral movement (the sprocket can be pushed/pulled on opposite sides and waggles about on the axle) then the sprocket carrier bearing is worn.

Eddiw 03-09-13 23:37
Quote:
Originally Posted by Pleiades (Post 191510)
If you have rotational movement (turn the sprocket some way before the wheel moves and takes up drive) then the cush rubbers are worn. If you have lateral movement (the sprocket can be pushed/pulled on opposite sides and waggles about on the axle) then the sprocket carrier bearing is worn.
I have not tried to in the rotational movement yet.. My bike is in another town atm.. But yes I was able to move the sprocket pushed/pulled on opposite sides and waggles about on the axle..
How hard (and expensive) is it to fix the sprocket carrier bearing?

Pleiades 03-09-13 23:44
Quote:
Originally Posted by Eddiw (Post 191517)
How hard (and expensive) is it to fix the sprocket carrier bearing?
It's one of the easier bearings to do, mainly because it isn't attached to anything big and unwieldy, plus it seems to slide out without too much bother. Drive it out, then ideally press (but you can drive) a new one in. The bearing is about �15.


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