It’s a sub forum under suspension,
https://www.hdforums.com/forum/air-suspensions-155/

 

I have a 2010 RK built out to a 107 with heads. I also have an M8. They are different animals. The M8 is a good smooth low end motor. The built TC is a blast to ride. Much more from about 2000rpm on up. I vote for at least a cam and headwork. Spent the rest on suspension.

 

Sounds good,My 103 is in very good shape with low miles, should I go the Fuelmoto 107 kit or just a cam ?

 

Depends on what you want out of it. I have just cammed bikes in the past and it does make a difference especially with the pre-Rushmore motors. I also went all out with heads to match the build and there is another huge jump in performance. With the heads comes increased compression that puts the low end back into cams that designed to flow well at higher rpms so you get a flatter torque curve. It's your call on how you want to go but the heads/cam are going to make more a difference than 4cu/in.

To be fair being in the states the cost of boring cylinders and new pistons and rings is pretty low dollar when your builder is doing the boring while everything is apart anyway. This is why a lot of us just go big bore to get everything we can out of a build.

Where you are located it looks like you are going to be restricted to a kit. I would think in that case call or email fuel-moto to discuss what you are looking for. Cams that work well for stock compression do not work well with higher compression and displacement. My issue with kit builds is keeping the dyno guy from blaming the components in the kit and vice versa. At least with Fuel Moto's stuff they give you a base map that is close and you can tweak it yourself with the auto tunes.

 

I just did what you are considering.....

I had a 2012 FLHTK that was a stageII, set up with extras to my liking.

I wanted more power, but really liked the 49mm front end on the Rushmores....

I followed the rumors and finally the introduction of the new M8... That was the bike I wanted to upgrade to... a new touring M8 with a stage IV from the start! I figured I'd be spending around $31K (probably a little more)

I was hearing the rumors of a new frame in 2018, so I decided to wait until 2018, in case the new frame was for the touring models...

Unfortunately, while waiting, drooling, and reading everything I could about the new M8.... I learned of the trans oil transfer issue and the sumping issues (especially with the Stage III & IV kits). Although most bikes don't have these issues, I became very disappointed at how the MoCo was handling these issues....

After number crunching and soul searching, decided to blow off the M8, and stay with the twin cam. I own 3 twin cams, and know them pretty well... I can do all my own work on them...

I upgraded my 2012 to a 2016; the last year of the twin cam, with all the Rushmore improvements ($8K). I've set the budget for the mods. After Ohlins from Howard (front & rear) ($2K), a new seat ($1K), and several personal touches to the bike ($1K)... I will have approximately $9K to spend on engine mods, before I reach the amount of money I would have spent on the new M8 bike I wanted....

I think I can make a twin cam run as good or better than a Stage IV M8, with $9K of engine mods....

In your case, it seems you won't need to upgrade the bike, just the accessories.. you'll be much further ahead of the money curve than I was.... and on a good performing bike set up for you.

PS- I'm a big FuelMoto fan, I've heard nothing but good about their 107 mod.... I'm actually considering about two years of saving, then talking to them about one of their Outlaw engine swaps... yeah, for me it's a sickness...

Good luck with your decision...

 

Thanks for the info. i really like my bike and like you said for a lot less than a new M8 I can vastly improve performance and handling which is all I find lacking on my bike. Plus when you put your own ideas into something it becomes truly yours.

 

Big plus one. Is 4 cubic inches really worth it, regardless of twin cam or M8? I don't know but strongly suspect a souped up 103 would give even a new M8 a helluva run for it's money, as that has just about always been the case with new/upgraded cars and motorcycles. And upgrading to new is going to cost a pile of cash, especially if you have to repurchase most of any existing modifications/upgrades.