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September 1st, 2018, 07:49 PM   #1
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Crank runout

Hi guys,

Crank runout on the 570. I get 2.5thou. Does anyone know what the runout is on these? I couldnít find it in the repair manual. Measured at the end of crank clutch side.

Ta.
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September 1st, 2018, 09:40 PM   #2
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September 2nd, 2018, 01:13 AM   #3
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Originally Posted by 383hq View Post
.
Thanks mate, yeah I did eventually find it. Itís in spec, yet there still is vibration.

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September 2nd, 2018, 02:43 AM   #4
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Dunno about the berg, but the 576 ktm stroker cranks use to spread at the webs after a few hundred hours of motard track use.

The manual says to measure web width (63mm), so problem may still exist ?

Not sure of your problem, nor why you suspect the crank, but you can easily have good TIR, yet still have dynamic unbalance (vibration).

Send it, the rod, and piston to Phil Tainton, Crank Works, Crankshaft rebuilders or Saliba's automotive if you suspect dynamic unbalance to check (and if needed, rectify)
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Last edited by 383hq; September 2nd, 2018 at 02:45 AM.
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September 2nd, 2018, 03:43 AM   #5
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Originally Posted by 383hq View Post
Dunno about the berg, but the 576 ktm stroker cranks use to spread at the webs after a few hundred hours of motard track use.

The manual says to measure web width (63mm), so problem may still exist ?

Not sure of your problem, nor why you suspect the crank, but you can easily have good TIR, yet still have dynamic unbalance (vibration).

Send it, the rod, and piston to Phil Tainton, Crank Works, Crankshaft rebuilders or Saliba's automotive if you suspect dynamic unbalance to check (and if needed, rectify)
I’m suspecting the crank in particular but it is in the list of possible causes. I’m wondering how far out the key is on the KTM crank compared to the Berg. But the KTM runs the 19mm small end against the Berg at 20mm. Yet this crank has the Berg rod. It’s a possibility but highly unlikely they’ve assembled this KTM crank with a Berg rod.

Thanks mate.
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Last edited by Alan; September 2nd, 2018 at 03:48 AM.
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September 3rd, 2018, 08:07 AM   #6
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KTM crank? The woodruff keys are at different position ktm vs husaberg.
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September 3rd, 2018, 03:24 PM   #7
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Originally Posted by jon andersson View Post
KTM crank? The woodruff keys are at different position ktm vs husaberg.
Yes Jon, but thatís something I considered is creating the imbalance.

There looks to ba about 50-60* difference. Prob would a greater vibe with that sort difference, still Iím at the point where I need to consider everything.
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