Something for M8 owners to watch for - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 26 (permalink) Old 04-14-2017, 09:24 AM Thread Starter
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Something for M8 owners to watch for

Buddy of mine in Texas is a mechanic at the Kingsvillle dealership. He was doing a dyno pull on a new 107" and this occurred

The MoCo engineers came out the next day to pick up the engine. Final diagnosis is still pending, but it appears that the counterbalancer got out of whack during hard engine braking and set up a strong harmonic vibration that wrecked the balancer and then took out the oil pump, cams, etc.
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post #2 of 26 (permalink) Old 04-14-2017, 09:40 AM
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Ouch!


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Originally Posted by nipplesurfer View Post
then took out the oil pump, cams, etc.
Back to 1 cam on the FrogHead

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post #3 of 26 (permalink) Old 04-14-2017, 09:42 AM Thread Starter
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Yeah, i think i can live with the TC vibration....
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post #4 of 26 (permalink) Old 04-14-2017, 09:53 AM
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That is pretty catastrophic right there...

So strong engine braking, that means chop-throttle from max rpm and allowing it to spin down from there rather than clutching and letting the revs lower while the chassis slows down?

This should be interesting going forward - and I sure hope this does not happen to anyone while rolling!

Thanks for taking time to post the picture.

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post #5 of 26 (permalink) Old 04-14-2017, 11:32 AM
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Ouch...I'll stick with my '15 Ultra Classic. I have no problem with the way it runs!! Putting counter balance weights in the engine is just more parts to get fogged up!! Will have to wait a few years to let them get the bugs out!! However, I believe the softails have had counter weights for years!!
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post #6 of 26 (permalink) Old 04-14-2017, 12:46 PM
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However, I believe the softails have had counter weights for years!!
Ever since 2000 when the Softail got the TwinCam motor.
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post #7 of 26 (permalink) Old 04-14-2017, 12:47 PM
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The way that counterbalance is bent, it looks like something hit the counterbalance, not that the counterbalance destructed on it's own.

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post #8 of 26 (permalink) Old 04-14-2017, 01:05 PM
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Let's see the dyno sheet of the run , how many RPM's? HP? TQ?
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post #9 of 26 (permalink) Old 04-14-2017, 01:11 PM
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Quote:
Originally Posted by Kainam View Post
The way that counterbalance is bent, it looks like something hit the counterbalance, not that the counterbalance destructed on it's own.
Maybe, the rod looks like might show something but I would think it would be a lot more obvious if that was the case.

The timing looks different between the skinny and wider sets of teeth on that balancer too dont it? Must be intended or there wouldnt be a separation at a guess.
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post #10 of 26 (permalink) Old 04-14-2017, 01:43 PM
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Here's an extreme reason for avoiding a first year design.

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