Sprocket carrier bolts

Squeaky back brake? Hard to control at 30mph/40kph?
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Sprocket carrier bolts

Post by ogden » Mon Oct 13, 2014 11:31 am

Bit of a heads up, this one.

One of the downsides of running a chain oiler is things at the back of the bike rarely need adjusting. I'm about to hit 30,000 miles on the original rear sprocket and it still looks pretty much the same as it did when it left the showroom. And if something doesn't need adjusting, it often doesn't get checked or maintained either. I suspect this is one of the reasons I've got a knackered chain adjuster - it's spent so long in the same position it's had more than enough time to seize up.

Anyway, check your sprocket carrier bolts. Twice now I've found mine loose, and the clearance between the carrier and swingarm is low enough that a loose nut will start to shave through the swingarm if left long enough, which means at best a chain covered in swarf and at worst a buggered swingarm.

Don't ask me how I know, etc.
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Re: Sprocket carrier bolts

Post by BradTaz » Tue Oct 14, 2014 12:10 am

+1 :oops:
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Re: Sprocket carrier bolts

Post by Sweetlou » Sun Oct 19, 2014 10:28 pm

Stupid question.... Where is the bolt head so I can check mine?

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Re: Sprocket carrier bolts

Post by ogden » Sun Oct 19, 2014 10:40 pm

Pull the carrier out of the cush drive and turn it over. The hex socket heads are on the other side.
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Re: Sprocket carrier bolts

Post by Sweetlou » Mon Oct 20, 2014 1:29 am

That's annoying, the only way to check is to pull the wheel off? Ugh way to over engineer KTM

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Re: Sprocket carrier bolts

Post by budgesrsv » Mon Oct 20, 2014 9:18 pm

You can do a quick visual check by seeing if there is any movement in the captive nuts on the outside of the sprocket. Obviously if there is movement then the wheel has to come out to tighten them up.
Before you tighten them you need to clean off any old loctite from the threads and put fresh stuff on. If you don't clean away the old stuff the bolts can tighten up before they have seated down fully.

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Re: Sprocket carrier bolts

Post by Yoozy » Tue Oct 21, 2014 7:45 am

Sweetlou wrote:That's annoying, the only way to check is to pull the wheel off? Ugh way to over engineer KTM


Loads of bikes are like this. Whenever you clean the bike just make it part of your routine checking :D
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Re: Sprocket carrier bolts

Post by Yoozy » Tue Oct 21, 2014 7:47 am

budgesrsv wrote:You can do a quick visual check by seeing if there is any movement in the captive nuts on the outside of the sprocket. Obviously if there is movement then the wheel has to come out to tighten them up.
Before you tighten them you need to clean off any old loctite from the threads and put fresh stuff on. If you don't clean away the old stuff the bolts can tighten up before they have seated down fully.

Prillas have a bit of history for the buggers coming loose. I've got a couple of Renthal rear sprockets off me Apes and they look identical to the Smt, you know owt mate ?
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Re: Sprocket carrier bolts

Post by budgesrsv » Tue Oct 21, 2014 8:09 am

Off top of my head i cant say whether they fit ktm. Ive got the standard smt sprocket if you want to compare them

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Re: Sprocket carrier bolts

Post by Yoozy » Tue Oct 21, 2014 8:18 am

More of a curiosity mate, I'm happy with what's on it tbh.
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Re: Sprocket carrier bolts

Post by BradTaz » Tue Oct 21, 2014 11:30 pm

Sweetlou wrote:That's annoying, the only way to check is to pull the wheel off? Ugh way to over engineer KTM
Sweetlou, I agree, but I think it's more a Marchesini thing than a KTM. BST carbons, OZ and other aftermarket wheel manufacturers use a similar system. The bonus (and the ONLY one I can think of - is that if you spend a gazillion on aftermarket wheels, you can still use your KTM sprockets. Hmmm)
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Re: Sprocket carrier bolts

Post by BradTaz » Tue Oct 21, 2014 11:34 pm

Oh shit, forgot to add that I have a large hex/spline/torx (10mm base) bit set that is driven by a 3/8 socket drive. Using the uni joint and and extemsion bar, I can tighten the bolts without removing the wheel.

The bit set is branded as Kinchrome down this way. You guys would have the same version available under local branding. Somewhere.
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Re: Sprocket carrier bolts

Post by budgesrsv » Wed Oct 22, 2014 8:17 pm

I would always remove the wheel/carrier if i found the nuts loose to make sure everything is ok and to apply some thread lock so they don't come loose again.

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Re: Sprocket carrier bolts

Post by ogden » Sat Apr 18, 2015 8:55 pm

Gave the bike a once-over today, in preparation for a trip abroad in a couple of weeks, and noticed four of the five carrier bolts were loose, one on the verge of starting to shave through the swingarm again. I'm going to have to add this to my (rudimentary) maintenance schedule, as I didn't notice anything loose when I changed the rear tyre a few weeks ago.

Also fitted a (genuine HRC!) catch bottle for the airbox breather. I have a horrible feeling it's blowing oil out of the airbox, which may mean the rings are on the way out. The bike's only three years old and the chassis is (mostly) fine, so this is at worst going to be an excuse to source a 990SDR motor and do a cheeky upgrade.

300 miles or so to do tomorrow. Will there be oil in the catch bottle, or am I imagining things? Place bets now!
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Re: Sprocket carrier bolts

Post by BradTaz » Sun Apr 19, 2015 4:39 am

pics of the catch can please Ogden...

Is it a baffled one or does it have a filter screen to scrub the oil vapour out?

Dont forget the balance shaft seal lets a lot more crank vapours out if it lets go, might be worth looking into that if you're losing a bunch of oil out the breather. My bike was spewing oil at 14000 km due to a balance shaft seal...
Cheap part and easy to fix too.
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Re: Sprocket carrier bolts

Post by ogden » Mon Apr 20, 2015 1:58 pm

BradTaz wrote:pics of the catch can please Ogden...

Is it a baffled one or does it have a filter screen to scrub the oil vapour out?.
I think you've vastly overestimated the quality of an HRC catch bottle.
IMG_20150419_100313.jpg
Seems OK, anyway. 200-odd miles done, mostly at speed, and not a drop in the bottle. I'll leave it on though.
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Re: Sprocket carrier bolts

Post by BradTaz » Mon Apr 20, 2015 4:45 pm

HRC...
Harolds Rudimentary Containers?
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Re: Sprocket carrier bolts

Post by ogden » Mon Apr 20, 2015 4:49 pm

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Re: Sprocket carrier bolts

Post by BradTaz » Mon Apr 20, 2015 5:22 pm

You werent joking!
Mate, if you want a true indication of how much oil you're losing in blow by, shove a few of the stainless pot scourer pads in the bottle to filter the oil vapour before it blows back out the top of the bottle.
Looks to sweet FA there though for 200miles.
Before replacing the balance shaft seal (and after a coupl hundred miles) I would have has 5mm of oil in the bottom of a catch can the size of that one.
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