Engine upgrade suggestions
Grand HDF Member
Joined: Jun 2013
Posts: 4,998
Likes: 864
From: Iowa
I didn't use a kit and have a Dyna but I can say that I went from an 88" with stock cam to an 97", Andrews 37H cam, and bumped the compression to 10:1 with domed pistons and my mileage is still at 47 mpg highway. It really only eats at your mileage if you hit the throttle hard from stops. I will say that a kit isn't particularly necessary. If there is a good machinist in your area then find the pistons you want (forged vs cast, skirting, compression, and diameter) then take your jugs and pistons to him to match the bore to the pistons. After that put the jugs, pistons, and new cam in. Saves a lot of cash, enough that you should also take those heads to the machinist as well to get a valve job. Edit to add: Take a look at the Andrews 57 cam as well.
Last edited by Jay Guild; Sep 28, 2017 at 11:15 AM.
Stellar HDF Member
Joined: Jun 2007
Posts: 2,928
Likes: 117
From: Ashby, Ma
I have the same build as old hippy except 999-6a cams. Over 16000 miles and consistent 41 mpg. I do 2/3 of time riding solo. Fuel milage doesn't really vary much. I've had zero issues.
The main reason I went with Fuel Moto was reputation and because they are within 2 hours of me. I have no regrets other than I always want more. If I lived in the east I would have gone with Hillside. Talk to builders and take their suggestions serious, its what they do!
The main reason I went with Fuel Moto was reputation and because they are within 2 hours of me. I have no regrets other than I always want more. If I lived in the east I would have gone with Hillside. Talk to builders and take their suggestions serious, its what they do!
Some of these new cams they didn't even have when I did my 777 build and they are getting remarkable power. I hear they are not as radical as you might think but FM will be clear about all of that.
Definitely think about target tune too, even if you don't do the 107 build. It really rocks and it's lowered now in price. ($399)
So much fun helping people spend their money.
Last edited by oldhippie; Sep 28, 2017 at 11:40 AM.
Elite HDF Member
Joined: Jul 2007
Posts: 3,903
Likes: 1,122
From: 48.067222,12.863611
If you want to keep reliability and fuel economy, stay with a cam only. The CR 570-2 would be a great choice. Look at the andrews 48 and 57 too.
A 107" kit with some pretty basic headwork and cams could easily yield 115 TP and 105-110 HP. *Should* be plenty reliable.
It all comes down do what do you want to gain, give up and spend.
Personally, I'd either do the cam only or open it up and do the bottom end and go 117 or 124. Keep it simple or do it right.
A 107" kit with some pretty basic headwork and cams could easily yield 115 TP and 105-110 HP. *Should* be plenty reliable.
It all comes down do what do you want to gain, give up and spend.
Personally, I'd either do the cam only or open it up and do the bottom end and go 117 or 124. Keep it simple or do it right.
Thread Starter
|
Tourer
Joined: Aug 2013
Posts: 379
Likes: 38
From: Nebraska
If you want to keep reliability and fuel economy, stay with a cam only. The CR 570-2 would be a great choice. Look at the andrews 48 and 57 too.
A 107" kit with some pretty basic headwork and cams could easily yield 115 TP and 105-110 HP. *Should* be plenty reliable.
It all comes down do what do you want to gain, give up and spend.
Personally, I'd either do the cam only or open it up and do the bottom end and go 117 or 124. Keep it simple or do it right.
A 107" kit with some pretty basic headwork and cams could easily yield 115 TP and 105-110 HP. *Should* be plenty reliable.
It all comes down do what do you want to gain, give up and spend.
Personally, I'd either do the cam only or open it up and do the bottom end and go 117 or 124. Keep it simple or do it right.
Thread Starter
|
Tourer
Joined: Aug 2013
Posts: 379
Likes: 38
From: Nebraska
That is impressive! Anyone else have experience/dyno sheets with this cam? Where can I get more info?
Grand HDF Member
Joined: May 2008
Posts: 4,624
Likes: 189
From: Newcastle, Ca.
The tuner is a very nice guy. I bought my used 57's from him. Call or email him for questions. He has done lots of good testing with various cams and exhausts and sharing the results on another forum. On another thread hillside mentioned they get similar results with the cr570.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
The Best and Worst Harley-Davidson Moves of 2025
Verdad Gallardo
Stage IV
Joined: Aug 2017
Posts: 4
Likes: 0
From: Albany NY
I just checked my mileage, the old skool way miles/gallons. I did 200 miles, in 80'F weather, here in New England. 41mpg, and then head temps run 260 via the Powervision, and the oil temp ran 200'F to 215 all day. (I have a basic Jagg 5 row oil cooler, not fans needed)
Go over and read this thread, all 228 pages of it, and hundreds of FM 107 riders, and you'll find 1 that comes to mind that had problems, and that guy wasn't using the suggested kit, but just part of FM's kit.
I'll say this, if you needed support and parts, it'd come faster and better from FM than anyplace else I know, including the local HD dealer. (just my opinion, but their service is beyond good)
https://www.hdforums.com/forum/touri...fuel-moto.html
...on the other hand, depends on how much you want/need and also affordability. A decent set of cams and you might be quite happy. I admittedly spent some good bucks on the engine, BUT, for me, I'm a fixed income retired guy and 29K for a new bagger wasn't in the cards, never mind all the other ergos (bars, seats, etc) it took to fit me just right.
Nice thing you've got going for you is you've got the Fuel Moto support for any mods you decide to do, he'll build you a new base map for your PV, and you're all set up with the right header/pipes and powervision. If you REALLY like the bike and see yourself keeping for a number of more years, GO FOR IT!!
Go over and read this thread, all 228 pages of it, and hundreds of FM 107 riders, and you'll find 1 that comes to mind that had problems, and that guy wasn't using the suggested kit, but just part of FM's kit.
I'll say this, if you needed support and parts, it'd come faster and better from FM than anyplace else I know, including the local HD dealer. (just my opinion, but their service is beyond good)
https://www.hdforums.com/forum/touri...fuel-moto.html
...on the other hand, depends on how much you want/need and also affordability. A decent set of cams and you might be quite happy. I admittedly spent some good bucks on the engine, BUT, for me, I'm a fixed income retired guy and 29K for a new bagger wasn't in the cards, never mind all the other ergos (bars, seats, etc) it took to fit me just right.
Nice thing you've got going for you is you've got the Fuel Moto support for any mods you decide to do, he'll build you a new base map for your PV, and you're all set up with the right header/pipes and powervision. If you REALLY like the bike and see yourself keeping for a number of more years, GO FOR IT!!