Big Bore kit
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Joined: Feb 2020
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From: So Cal desert
Big Bore kit
Ok when I bought my 2007 Fatboy in 2020 the salesman made a big deal out of telling me it had a big bore kit on it. I haven’t been able to tell if it really does. Without taking the heads off can one tell? What are telltale signs, if any, and is the juice worth the squeeze so to speak? Currently the bike has exactly what was on it when I bought it; VH 2 into 2 exhaust, VH VO2 air cleaner, VH Fuel pak. It needs a good tune beyond the generic settings on the fuel pak. Comparing it to other same gen unaltered Fatties it seems to ride the same just has a better sound.
my dilemma is whether to keep her and upgrade away until I get what I think I want or trade in for (in other post) a 2016 Fatboy S
my dilemma is whether to keep her and upgrade away until I get what I think I want or trade in for (in other post) a 2016 Fatboy S
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From: backwoods
I am not sure there is a good way, if he bored the stock cylinders. I have never used a FP do the setting list specs. Not that, that proves anything.
I would just enjoy the bike until there is a reason to pull apart such as replacing lifters, breathers, and tensioner pads.
What does this have to do with selling bike? Do you like it or not? Even if 103 or 107, that is the question.
I would just enjoy the bike until there is a reason to pull apart such as replacing lifters, breathers, and tensioner pads.
What does this have to do with selling bike? Do you like it or not? Even if 103 or 107, that is the question.
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From: So Cal desert
Thank you. I like the bike though always looking to get better performance or improve ride quality. In the case of potential selling I just don’t want to misrepresent an upgrade if it’s not there as well as just trying to educate myself.
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From: backwoods
Camming and porting the heads would be the next step for either bike, if not done. If I was selling it, I would just say the dealer told me this, but I have no way of knowing. Ethically you are fine, telling the truth.
Maybe tuning it and doing dyno run might tell you. I am not sure what stage I 96" should produce or 103 or 107. But you could get an idea if you google. But again, is it enough power?
I am fairly happy with my 103s One is bored 2007. But I am sure I would like a M8 too.
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From: Northern plains
Last edited by Hathaway; Apr 19, 2025 at 09:24 AM.
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From: backwoods
But if they bored stock cylinders, rather than buying SE or some other brand, I am not sure how you would know. I am assuming no harley logo or brand on the cylinders. Stock would have nothing on them.
Road Captain
Joined: Sep 2014
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From: Utopia
https://www.hdforums.com/forum/softa...sign-flaw.html
and other similar threads, about the non-centralised front wheel on the 2007 Fat Boy, which you may have already noticed on the motorcycle. This may make it less desirable to some riders, and therefore more difficult to get rid of when the time comes.
and other similar threads, about the non-centralised front wheel on the 2007 Fat Boy, which you may have already noticed on the motorcycle. This may make it less desirable to some riders, and therefore more difficult to get rid of when the time comes.
Last edited by bustergut; Apr 19, 2025 at 09:51 AM.
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Road Captain
Joined: Apr 2024
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From: Northern plains
When I bought the RoadGlide, they had service records of it done by the dealer's shop. I guess that's a big reason that I bought it - I usually never trust " home or shade tree -do-it-yourself" engine work. Im a "leave it stock" type, but I really liked the bike. (As a former overhaul mechanic, I saw how much diligence it took to do things correctly.) As stated, I was satisfied with the engine's performance, and yeah, there was no label or imprints to know it was modified.I would have been more suspicious, if it had S&S or Screamin Eagle stamps on it.
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From: backwoods
You can get into the debate about seasoned cylinders even. But that is not why I did it. Cheaper to bore.
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From: san antonio
The fact that the sales guy referenced the upgrade as a "big bore kit" might indicate that the kit was the standard kit offered by the MoCo. The MoCo offered two configrations; pistons and cylinders as a "Stage 1" kit and added a cam for a "Stage II" kit. The cam was usually the SE203 but could be swapped for the SE204. If the work was done at a dealership there will be a record which will show up if the VIN is run through the system.
Another way to get an idea would be to run a compression test. If CCP comes in at about 190psi or more, that's a pretty good indicator that the motor is a 103". CCP in a stock 96" motor should register about 180psi; maybe a point of two more. Just need to be sure the test is performed properly with a known accurate gauge.
Another way to get an idea would be to run a compression test. If CCP comes in at about 190psi or more, that's a pretty good indicator that the motor is a 103". CCP in a stock 96" motor should register about 180psi; maybe a point of two more. Just need to be sure the test is performed properly with a known accurate gauge.
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