yes that obviously makes the most sense for the most performance. If I get the CNC heads and 64 mm throttlebody, I would gain horsepower though correct? Possibly be able to run the gears out a little further the RPMs I mean? I know the game would be minimal but do you think this would be A decent avenue to go?

 

yes, it would definitely help top end power.
an upgrade to the se 515 cam would be better for more top end power.

 

When did you purchase your bike?
Have you dyno tuned your 119? What power did it make?

What air breather & exhaust did you use?

What are your goals for the bike?

 

I purchased the bike in 2020, Actually in 2019 but it’s a 2020. Went stage one fairly quickly, then stage two with a tourque cam, then did stage three probably close to six months ago I’m guessing. I have a ventilator extreme air breather and Bassani true dual pro street turn out all the way to the heads exhaust. The 119 was dynode made 133 foot pound torque, and 110 hp. I do love the bike it does everything a bike on the streets should do. Sure I’d like to change and probably will the brakes and maybe the suspension. The pick up on the throttle now is pretty amazing. What are my goals? I’d love to make it into a super hot rod. I kind of would like to go stage four just to get the horsepower up near the torque numbers, But it’s definitely not needed for on the street. I like that idea of making it a firebreathing hot rod, but do I want to spend that much money, probably not as pretty bad *** now just the more performance should put into them the more you want to.

 

Your dealership will likely warranty your stage 3 for 2 years from install assuming you have only ever upgraded to the SE tuner and that you’re dealership isn’t saying anything to Harley about your non compliant exhaust well and that you are meeting your service requirements. Warranty is worth something because a blown up engine is expensive to repair or replace and when hot rodding it can & does happen. 110HP/130TQ with a good dyno tune should be an enjoyable ride and the cam is still a great street cam not a high rpm only cam. A heavy cruiser with 2 cylinder engine was not designed to be a race bike. Not that you can’t make them go pretty good. You just have to find the happy & affordable balance for you. You might already be there.

I did a stage 3 kit (SE-498 cam) on my 107 softail. Only a 114ci as it was prior to the big bore kits. 21k hard but maintained miles. No issues. I also added the 64mm throttle body & intake, the S&S Streetmaster 2-1 exhaust, and SE tuner. This allowed me to retain full warranty. (Which has recently expired)

The TB, intake, & 2-1 allowed deeper breathing inhale & exhale ie more horsepower despite having the same cam and less displacement than yours. It made 116 HP but they had to use a map for a 117ci to get the needed fuel. SE tuners are very limited in their adjustability to meet EPA compliance. Also the SE tuner limits top speed to 122 mph though you can add an on off switch for your Speedo to bypass the speed limiter. Mines run 140 according to my phone GPS. The only alternative to eliminate the speed limiter is an aftermarket tuner which immediately voids warranty.

From your questions & posts you have limited motor building knowledge and likely are not mechanically inclined. This is no insult we all have different skills & abilities. Point being there is probably particular advantage to you in keeping your hot rodding under warranty.

The next jump up for you would be the stage 4 128ci kit. It’s slugs n jugs injectors more cam & ported big valve heads plus bits & pieces for your clutch etc. Big power but talk to your dealership first to make sure they will warranty it for 24 months. Pricey but you actually get what you pay for. Brakes would be a great upgrade to go with this power level. Also they tend to be hard on cranks at this level so many advise crank work first which gets into more parts time & labor expense. Lots to consider at this level.

 

I did talk to the dealership about the stage four kit. I’d rather not pay for new cylinders and pistons again. If I change just the throttlebody and the top end does that keep it 119 in.ł? You’re right I’m not totally mechanically inclined I do have the whole parts book, but I’m not sure I would want to dive into that. I don’t have the set up here or garage space so to speak. I thought about maybe changing the cam but this one 19 in.ł stage three belt is pretty good with low speed there’s no surging you don’t have to really jump on the throttle like I did with the stage two and with the stage to there was a little bit of herky-jerky Ness. I just wonder if I went stage for keeping it 119 Cubic inch if it would wind out a little more in first gear or just a little more scream in top end. Not that I really need it. I’ve won 120 with this and it feels like it almost wants to float. And this bike has been adjusted so that it doesn’t have the top end limiter.

 

You could go to the extreme heavy breather air cleaner, 64mm TB & intake, SE-517 cam, and perhaps better 2-1 pipes plus a remap & dyno tune. This could provide a fair HP jump without spending big on slugs jugs & cylinder heads AND retain warranty. Thinking low to mid 120s sameish torque as it makes now. I think at that point you are pretty much out of injectors & stock heads.

 

Dyno tuning with the hd tuner?

 

The first question to answer is why you would want a 128" motor before you have explored the potential with the 119"? You can get loads of power out of what you have with a better intake, cam, and exhaust. The M8 engine does not need a high-lift cam and a lot more displacement to make exceptionally good power.

 

I am pretty happy with the power. And I know it’s not a metric bike and I’m glad for that. I do have the extreme breather that Harley Davidson put out it’s the ventilator extreme ( Not sure how much heavier breather I can get than that ). And you’re right I don’t want to high lift cam because I want this bike to be smooth throughout the rev range especially when riding slowly. Which intake would you suggest? And I do love the pro street turnouts that I have on it from Bassani. They’re all the way back from their heads and they’re quite open in the pipe. I really am not sure I’d like to change the pipe or not. I kind of like the look of the duel exhaust.