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XT660Z T�n�r� Tech Section Tyres, Mods, Luggage & Long distance preparation

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  # 1  
Old 21-04-11, 00:33
offroadtoad offroadtoad is offline
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Bad vibes and new cush drive

For the last few rides (say 400 miles) I've been suffering from quite bad vibes � enough to feel coming up through my feet. Took the Bark busters off and refitted original bar weights, and finally replaced the cush drive rubbers after 9000 miles (I'd done the kev mod at 3500 and to be honest the rubbers that came out would probably be fine again with more packing) � I'm running out of other things to try.

Is it possible for the chain to affect the vibes? it's on the original chain (which has been scottoilered from new) and it looks OK, sprockets look good too. Maybe it's too tight? or a slightly stiff link?

I'm open to suggestions

Cheers
  # 2  
Old 21-04-11, 08:14
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Tony660x Tony660x is offline
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Tyres need rebalancing?
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Old 21-04-11, 10:39
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Check every nut & bolt is tight.
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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
[
My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946

  # 4  
Old 21-04-11, 21:01
offroadtoad offroadtoad is offline
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Thanks guys, I'll go round the bike with a torque wrench this weekend. I've not long had a new front tyre fitted, though I didn't notice an increase in vibes when it went on, maybe it wasn't balanced quite as well as it could have been.
  # 5  
Old 21-04-11, 21:49
tripletom tripletom is offline
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Check front sprocket condition, and the tank mounting bolts. The Ten is prone to bad vibes whenever it has a full tank anyway.
  # 6  
Old 23-04-11, 00:31
Peatbog Peatbog is offline
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My XTZ got so vibey recently I started to hate the bike.

I adjusted the chain, replaced the Cush drive rubbers (again) and at the 1st MOT the other day the shagged rear wheel bearings were replaced. Now the bike is nice again and I love it again.

I would've Kev'd the Cush rubbers but they were pounded into a sticky goo like the last ones so no point.

Pete.
  # 7  
Old 23-04-11, 01:10
JMo JMo is offline
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What sort of tyres (tread pattern) are you running? You can find a new tyre on one wheel and an old tyre on the other sets up uneven vibrations.

Another thing could be the chain - if it's started to stretch and/or the sprocket teeth are worn, then you can get a pulsing through the drive train due to the slack between the chain and teeth, that feels like a vibration.

Jx
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  # 8  
Old 23-04-11, 22:57
offroadtoad offroadtoad is offline
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Tyres are standard Tourances at the moment Jmo � front's done just less than 1K, rear's done just over 3K. might well be the chain � bike's only done 9.5K though, and it's been bathed in scott-oil from the get go. How long are the chains tending to last on these?
  # 9  
Old 24-04-11, 00:02
JMo JMo is offline
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I got 18,000 miles out of a chain and sprockets in the US, although I have to say they were totally shot by then - adjusting chain every couple of days!

You can check the chain wear by lifting it off the rear sprocket (it shouldn't lift more than a couple of mm). To be honest, if you've been using a scott-oiler, it should still be fine after only 9.5K, unless you've been riding in a lot of dusty or wet conditions perhaps?

I don't imagine the [tread pattern of] Tourances would cause significant vibration, although as Tony660x suggests, you might want to check the wheel balance.

I'd go through things one by one - check tyre pressures, wheel bearings, chain wear/slack, cush drive rubbers - those would be the 'physical' things...

However, if it feels more like it coming from the engine itself, then possibly something is up with the fuel mixture and/or TPS (throttle position sensor), but I'm not techy in that respect - Kev can probably offer more precise advice there...

Jx
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