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post #1 of 17 (permalink) Old 05-25-2013, 07:33 PM Thread Starter
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Crank runout

Well crap. Dilemna time.

In the process of swappin cams I measured the crank runout and @5k miles I'm showing .007" without the cam plate installed. The all and knowing factory says it's AOK cuz good is .000-010". Out of spec is .012"

So decision time. Install the new cams, or reassemble with the stock cams again. Curious what some of you guys who do.

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post #2 of 17 (permalink) Old 05-25-2013, 08:02 PM
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I had the same run out, so I went ahead and split the cases and had it corrected.

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post #3 of 17 (permalink) Old 05-25-2013, 08:45 PM
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You should be ok for chain drive cams. You won't be able to use the gear drive with that runout. JMO

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post #4 of 17 (permalink) Old 05-25-2013, 10:50 PM
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Tough call. My bottom end is at Franks right now getting fixed.

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post #5 of 17 (permalink) Old 05-26-2013, 02:32 PM Thread Starter
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Thanks for the responses.

I am going to talk to a couple of go-to guys on Tuesday. Overall the cam plate and associated parts look better than my last TC which had .008" run out when I opted to trade it in. But I'm leaning toward running the 57h's until I gather all the parts to build this right.

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post #6 of 17 (permalink) Old 05-26-2013, 02:59 PM
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Originally Posted by rageglide View Post
Thanks for the responses.

I am going to talk to a couple of go-to guys on Tuesday. Overall the cam plate and associated parts look better than my last TC which had .008" run out when I opted to trade it in. But I'm leaning toward running the 57h's until I gather all the parts to build this right.
Does run out get any worse over time?

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post #7 of 17 (permalink) Old 05-26-2013, 03:13 PM
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Did you feel or hear a problem before you tore it down for the cam install? If it was me I wouldn't worry about it. Do you realize what .007 of a inch is in measurement? A piece of paper is .004 so .007 is nothing. It's not a rocket ship slam those cams in and enjoy.


I really wonder if there would be so much talk about these crank problems if there was a Internet to read about stuff and worry. It reminds me about the State Farm commercial. Everything on the Internet is true. Hahahahaha

Anyways what are u going to do about it? Harley won't do anything until .012 and if they do decide to fix it don't go to my harley dealer they can't fix shit. I spend 50k on 2 bikes in less than 7 months and they can't do a 1k service correctly. 2 out of 3 drain plugs loose and a drive belt that's tight as hell and making noise.
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post #8 of 17 (permalink) Old 05-26-2013, 03:17 PM Thread Starter
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Does run out get any worse over time?
Absolutely. My tc88 had .003" and 15k miles later was at .008". That's why you see lots of talk of welding the wheels so they can't shift.

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post #9 of 17 (permalink) Old 05-26-2013, 03:34 PM
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Mine was .006. When I purchased this bike it was my first ever 'new bike' purchase. I went into that knowing two things: 1) I was going to have this bike for a long time, and 2) I believed that over the years I would most likely go through a couple of builds (on a 107' right now). So... when I got the call from a shop with that number and knowing that I wanted to target greater torque/power down the road I decided to just take care of the issue and be done with it. I was fortunate to be in a position where I could do so. Glad I did.

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post #10 of 17 (permalink) Old 05-26-2013, 04:00 PM Thread Starter
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Did you feel or hear a problem before you tore it down for the cam install? If it was me I wouldn't worry about it. Do you realize what .007 of a inch is in measurement? A piece of paper is .004 so .007 is nothing. It's not a rocket ship slam those cams in and enjoy.


I really wonder if there would be so much talk about these crank problems if there was a Internet to read about stuff and worry. It reminds me about the State Farm commercial. Everything on the Internet is true. Hahahahaha

Anyways what are u going to do about it? Harley won't do anything until .012 and if they do decide to fix it don't go to my harley dealer they can't fix shit. I spend 50k on 2 bikes in less than 7 months and they can't do a 1k service correctly. 2 out of 3 drain plugs loose and a drive belt that's tight as hell and making noise.
Believe me I know what .007" amounts too and it's a crap load in machinist speak. It's the James Bond run out number. :-)

Yes running with .007 will work, it was running fine when I tore into the cam chest to swap cams. I'm planning to run the new cams in the short term.

Internet or no, flywheel shift is a real problem. I know several people I ride with who have lost the bottom end of their twin cam engine because of flywheel shift. One guy is on his 3rd bottom end (~150k miles). Ignorance is bliss. If I had not measured the runout I would not know how bad it is until the day the oil light comes on... Maybe it will stay at .007 for the next 20k or maybe it'll be at .014" at 10k... My money is on .014"@ 10k...

At this point I need to talk to a couple folks before I commit to a plan. I also need to figure out how much this will cost to fix on my dime if I decide to go that route. If the dealer will honor the warranty even with an aftermarket cam when the oil light comes on, then maybe i will let them repair it. If I do the work it's not gonna be a 103" when I'm done...

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