JMo was tinkering with one with someone else when she moded her tenere, but the idea seemed to fade away......

:blob8: Calling JMo! Calling JMo!.... was there any outcome on the chain guide idea JMo?

Looking at the pics from the H-L article in TBM, I don't think so.

hi. about seven months and 8500miles ago i made one. it uses the older ktm chain block circa 2002 the genuine is dirt cheap and lasts the longest [years of owning exc's].as it lasts so well it wears the split link so riveting the chain is advisable. has survived very well on proper off road!

the bracket is 3mm stainless plate 52x 65with a right angle fold, so now52x40 with a 25 right angle. the slightly slotted 8.5mm holes where it secures to the swing arm.

the swingarm is drlled to the centre of the flat part,the rear most bolt is app 180mm from the end of the swingarm, i used stainless bolts facing down so easy to remove or repair if damaged on the trail. the bolt heads have a foot welded on to stop them rotating in the hollow of the swing arm. the block is fastened with 6mm bolts the rearmost hole is slightly slotted to adjust to sprocket size

http://i192.photobucket.com/albums/z...llybike020.jpg

http://i192.photobucket.com/albums/z...llybike021.jpg

http://i192.photobucket.com/albums/z...llybike019.jpg

i hope this helps, very reliable, easy to make and fit.give a good place for the scottoiler too. any probs give me a shout, stoic

See Stoic's pix above - this was basically the idea that I was working on too (using the KTM block), and I sent the block and design to Petebog months ago - unfortunately he's been busy with 'real life' and not been able to progress things further I understand...

To be honest, I've never found it necessary on the Tenere - however, in sloppy muddy conditions, I can see it might have a benefit... either that or I'm just lucky*?...

("It's not luck, Todd...")

J x

ps. I can see a nicely fabricated bracket/kit developed one day, utilizing the cheap-as-chips- nylon KTM pattern blocks from Race Spec?

Bad luck for me today. Riding to work this morning, chain came off 3 times. I turned around at the second incident and went back, going at 50km/h constantly avoiding any slightest movement on throttle control.
Still need to take a look at sprocket. No idea about engine case damages right now.
Talon cush drive unit looks scratched badly on the outside (left from chain).
Swingarm got several bad scratches. Chainwheel looks totally damaged.

Story: I did chain maintenance recently. After that I only did some short test rides with a new muffler. Today was the first normal ride. Chain and chainwheel looked good, no bad wear at all. Chain had 16000km, nearly no offroad. Chainwheel had 11000km.
But obviously my chain is at end of its lifecycle and got stretched extremely within the latest few kilometers, which I was not aware of. When coming off the chainwheel the latter also got damaged badly.

I have already got a supersprox chainwheel and ordered a DID VM chain today, also a new sprocket.

Need to check engine case tonight. Hope there is no problem there. With chainguard mounted, the chain would never have come off the chainwheel under these normal circumstances. I would definitely consider installing one, if I can get hold of one.

Phil

That sucks I hope your wheels/sprokets survived

chains should'nt be doing this under normal usage !

http://s1.postimage.org/11p5v1ix0/kettenblatt.jpg

Reason still unknown. No installation issues. Everything was fixed ok, hub, cush drive, sprocket, chainwheel bolts, wheel, swingarm. Chain had some slack, but not really bad. Chain btw. is within Yamahas limit of wear. Sprocket looks good. No idea what destroyed chainwheel (which looked good this morning, left side of picture).
Maybe chain started to slip through on it, teeth got shaved off and chain did no longer reliable stay in its place. I will definitely take this chainwheel to the shop and look at the strange wear. Probably there is a problem with chain line, wearing it off onesided. Maybe we need to grind a little more off the Talon cush drive.
I am sad about those scratches visible at the cush drive unit. But on the other hand, this unit could be replaced easily in case. Not cheap, however.

Regards, Phil

hi flatboarder, that looks very odd and a big pity the hub is marked, tho it could have been a lot worse, if the retaining bolts were yamaha's design [unlike your countersunk type] the damage would be more your swingarm

i guess it's an alu sprocket which i dislike as they can deteriorate very quickly [possible cause], the type you now have are really tuff and can outlast a couple of chains. is your engine sprocket good?

it has to be said a chain guide would do more good than harm, why yamaha never fitted one is beyond me!

bernard

Yes, you are very right. Actually I was quite happy chain did not get torn into it badly.

Engine sprocket looks perfekt. Really.
I used Aluminium chainwheels formerly with my KTM LC4 and EXC. There were no bad experiences apart from the need to replace them if they wore out. But that was visible.
In my case yesterday, I was totally surprised, and I really need to check chain line for correctness. Something destroyed the chainwheel in very short time without a warning before. Maybe just a matter of chain slackness or the new exhaust can with a little bit more torque at lower revs, I cannot tell.

Right. I need to find a solution similar to yours. Main problem actually is getting that small L-shaped piece of tin (shaping, drilling) and fitting it to the swingarm. I have no clue about metal works. The chain guard is no problem, easily obtainable for small money.

Regards, Phil

Would something like this work located close to the rear sprocket?
Probably better with a spinning nylon wheel but the concept would be OK and it also means you wouldn't need to accurately set the chain tension.

http://www.trialsbits.co.uk/product_...roducts_id=498

rob