Broken counter balance shaft
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Broken counter balance shaft
by Sweepea » Mon Apr 09, 2018 8:08 am
Anyone else experience this? Was riding in a hare scramble this weekend and ran into a Beta mechanic who said he could hear a an engine rattle on my bike as I rode by that he says is a broken counter balance shaft. He sounded pretty convincing. He says that he has repaired this several times on other bikes. Mine is a 2016 350 RR.
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Re: Broken counter balance shaft
by twowheels » Mon Apr 09, 2018 8:35 am
Maybe, maybe not. Unlikely you'd be able to keep running for long if truly broken, but if there's a new noise coming from the engine its certainly worth investigating.
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Re: Broken counter balance shaft
by hooter » Mon Apr 09, 2018 9:33 am
Maybe he was pit crew for one of your competitors? 
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Re: Broken counter balance shaft
by dirtbird » Mon Apr 09, 2018 11:07 am
On gen1 2014 350 engine, counter balancer bearing disintegrated and blocked oil galleries with the result being a seized cylinder head (ie camshafts). Admittedly, this was a racing bike at the end of the season. Bike also spent its first 20 hours as a test ride.
So an isolated example but it doesn't hurt to check it.....
So an isolated example but it doesn't hurt to check it.....
'10 RR450, '11 RR450, '12 RR498, '13 RR300, '13 RR300 Racing, '14 RR250/300 Racing - all gone
'17 RR300
'17 RR300
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Re: Broken counter balance shaft
by Sweepea » Mon Apr 09, 2018 11:46 am
Thanks team. Headed to my local (Miami) Beta shop with the bike tomorrow. I think the bearing disintegration is probably the culprit. Dealer says the bike won't run if the counter balance shaft is broken; makes sense. To be continued...
P.S. he was a competitors pit crew mechanic, but they were running a Beta along with two KTMs.
P.S. he was a competitors pit crew mechanic, but they were running a Beta along with two KTMs.
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Re: Broken counter balance shaft
by Sweepea » Tue May 01, 2018 10:39 am
Final answer: countershaft needle bearing was wiped out and scored up the countershaft. Repair job cost about $650; had to wait over a week for parts. What is up with the parts availability. I have no reliable source here in Miami/Ft. Lauderdale.
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Re: Broken counter balance shaft
by Darkside » Tue May 01, 2018 4:09 pm
Wow. sounds like that mechanic nailed it. pretty fortunate that it was noticed bore it totally disintegrated
Randy
2018 390 rrs, 2014 300 rr re, 2010 ktm 450 exc
2018 390 rrs, 2014 300 rr re, 2010 ktm 450 exc
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Re: Broken counter balance shaft
by NJZoltan » Fri May 18, 2018 1:13 pm
Sweepea wrote:Final answer: countershaft needle bearing was wiped out and scored up the countershaft. Repair job cost about $650; had to wait over a week for parts. What is up with the parts availability. I have no reliable source here in Miami/Ft. Lauderdale.
Curious...How many Miles do you have on the bike?
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Re: Broken counter balance shaft
by chasejj » Fri May 18, 2018 2:59 pm
Bearing failure at CS sounds like chain too tight maybe?
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