FM 107 and starter
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
Get your tune right! Got 10k on mine before I had to take it back apart for Unknown top end or tune issues. Other than that it was fine.
Last edited by soft 02; Oct 10, 2013 at 06:28 PM.
Tourer
Joined: Sep 2010
Posts: 302
Likes: 6
From: Tulsa,OK
I ran mine for about 3 months before getting the ACR activated due to a tuning issue with my Rev Perf EMS. It was definitely tougher on the starter with no compression releases. With the ACR activated, it turns over quicker and starts much easier. Compression releases are mandatory in my view and I think getting the heads machined for the ACRs is worth the money and trouble.
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
I dont have them but never seemed to need them. Always started fine even when it was 110* outside. Now if I did the B heads and a cr of 10.5 id get some cr's
Intermediate
Joined: Jun 2008
Posts: 41
Likes: 0
From: swartz creek michigan
Jamie did the level b heads on mine, 10.5 to 1, with compression releases. Before the build installed new compensator and starter. 107 is a great build.
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Road Captain
Joined: Dec 2010
Posts: 545
Likes: 8
From: antelope valley ca.
I'm at 10.5 and no comp releases, its killing my starter. Don't care what they say about corrected comp., with my cams(andrews55s) should be 9.36 - the same as my stock 96 was but the starter says otherwise.
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Road Captain
Joined: Apr 2009
Posts: 531
Likes: 4
From: Chile Flats, AZ
+ a couple
My 18 month old 107" has 15k miles with no issues. Have gone through 4 sets of CRs however... don't think the heads were drilled correctly.
Gonna try ACRs this winter... I always use the CRs, unless at over 5000' on a road trip...
Never a problem with starter or battery... with either the 107" or the 117"...
Gonna try ACRs this winter... I always use the CRs, unless at over 5000' on a road trip...
Never a problem with starter or battery... with either the 107" or the 117"...