How’s your 107 doing?
Elite HDF Member
Joined: Jul 2008
Posts: 4,741
Likes: 45
From: Indian Land, SC
They had your bike on their Facebook page....showed it stripped down and then the dyno run chart....Looks good...
Road Warrior
Joined: Aug 2006
Posts: 1,575
Likes: 7
From: Wisconsin
The FM107 in my Ultra is awesome. It's a tw-555 build with no head work. No issues with heat. I've got about 1 year and 6,000 miles on mine. Pulls like a freight train off idle and as long as I dare stay on the throttle. 106 hp / 121 tq
Trying to figure out which 107 kit to pu in my RGC now.
Trying to figure out which 107 kit to pu in my RGC now.
Road Captain
Joined: Jun 2012
Posts: 516
Likes: 1
From: Damascus MD
Uh oh, my next upgrade was going to be the Fuel Moto 107. I didnt realize doing a 107 without doing crank upgrades was even an issue. What issues are happening with the 107 kits and running stock cranks? I thought $2k for a complete 107 install was too good to be true!!!!!!
Everyone I know that has done a 107 has been lucky so far, I guess.
Ive seen certain situations where other failures with lifters, cams, etc, caused debris to take out the crank bearings. And a few situations where oil problems wiped out the crank bearings, but not particularly anything with the 107 kit causing stock crank issues.
Road Master
Joined: Apr 2012
Posts: 1,096
Likes: 17
From: San Jose
Uh oh, my next upgrade was going to be the Fuel Moto 107. I didnt realize doing a 107 without doing crank upgrades was even an issue. What issues are happening with the 107 kits and running stock cranks? I thought $2k for a complete 107 install was too good to be true!!!!!!
Everyone I know that has done a 107 has been lucky so far, I guess.
Ive seen certain situations where other failures with lifters, cams, etc, caused debris to take out the crank bearings. And a few situations where oil problems wiped out the crank bearings, but not particularly anything with the 107 kit causing stock crank issues.
Everyone I know that has done a 107 has been lucky so far, I guess.
Ive seen certain situations where other failures with lifters, cams, etc, caused debris to take out the crank bearings. And a few situations where oil problems wiped out the crank bearings, but not particularly anything with the 107 kit causing stock crank issues.
I have a Rev Performance 107 haven't been able to ride a lot, just over 8k since the work was done last year around this time, but it's holding up well. I had one issue related to the heads was taken care of, my crank trued and welded with the timken conversion so I don't think I should have any issues there.
Road Warrior
Joined: Aug 2006
Posts: 1,575
Likes: 7
From: Wisconsin
Uh oh, my next upgrade was going to be the Fuel Moto 107. I didnt realize doing a 107 without doing crank upgrades was even an issue. What issues are happening with the 107 kits and running stock cranks? I thought $2k for a complete 107 install was too good to be true!!!!!!
Everyone I know that has done a 107 has been lucky so far, I guess.
Ive seen certain situations where other failures with lifters, cams, etc, caused debris to take out the crank bearings. And a few situations where oil problems wiped out the crank bearings, but not particularly anything with the 107 kit causing stock crank issues.
Everyone I know that has done a 107 has been lucky so far, I guess.
Ive seen certain situations where other failures with lifters, cams, etc, caused debris to take out the crank bearings. And a few situations where oil problems wiped out the crank bearings, but not particularly anything with the 107 kit causing stock crank issues.
If you're building a touring bike, there is no reason to worry about the crank with a 107 kit. If you are building a +120 HP twin cam drag bike and are bringing it out of the hole at +5000 rpm, maybe you might want to think about welding up the crank...but then again you're also probably doing a lot of other work too.
My guess is that 90% of the 107s out there don't have the crank welded and trued. I don't view that as lucky, I view it that the 107s are a reliable upgrade.
No problems with my Ultra. I use it as a touring bike. The 121 tq my 107 kit makes is nice out on the road passing big trucks (or whatever else I want to pass). No crank work on mine; however I did upgrade to the SE clutch spring per FM's recommendation.
Last edited by equandt; Apr 15, 2013 at 11:00 AM.
Road Captain
Joined: Jan 2006
Posts: 508
Likes: 14
From: Tallahassee
About 7000 miles on my FM 107, no crank work. I ride it pretty hard some times with no problems yet. I am going to put a SE cam plate and oil pump in it next week. I had .002 runout when I did the 107 build and checked it. I am very curious to see if runout changed?!?!!?.
That will tell the story.
That will tell the story.
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Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
The crank is a bad design with loose tolorances. The rods also have a pis poor design at the small end. This is why the changed the design in 2010 and up models. I wouldn't trust a 07-09 to last 100k. No internet rumor just my opinion about these specific years going 100k with no issues. Wait a few years for this issue to present itself. At 118k my 96 went out. HD took a step backwards when they stopped doing the Timken bearing and forged flywheels and when they tapered the rods in 07 they became even weaker. Sure if your only putting a few k a year its not a problem but start putting some big miles on these motors and you will see more issues. And with the average pinion shaft being .003 sure thats fine for a while but it ends up beating up the bushing in the cam plate and putting early wear on the oil pump gyrotors. Im not making this stuff up. Look at the design and compare it to an 03 or 02. They are making these motors for ease of assembly and cost. Truth is most will never see an issue and sell it before its a problem.
