Top Rpm questions

Hi Folks. I have 2000 TC 88 that I upgraded to a 95 via a screaming eagle Big bore kit. I have installed the SE 211 cams. Just recently installed the CV performance carb kit which works great I might add. I have Vance&Hines Ovals as exhaust and the screaming eagle air cleaner upgrade. I have also added the BAKER DD6 six speed upgrade. Bike runs pretty darn good but.....
When dialing on it semi hard I can easily hit 5000 rpm through the first four gears. Once I hit fifth and especially 6th it seems to run out of steam at about 4000 rpm and the throttle is pinned. It gets embarrassing when you can walk away from your friends but they then blow by me like i'm sitting still . I am a big guy 6'7" and weight about 315 lbs. so i"m like two up all the time by myself but doesn't make any sense to me? If I can hit 5000 rpm at lower gears why not in higher gears? Any ideas? (I know people here love a puzzle). Thanks in advance.

They changed the primary ratio (as baker recommends) ? Whew.. Hope i answered your questions and appreciate the feedback. So far I have done all the work myself including the paint but I let baker install the 6 speed because I was at Sturgis and it was included.

It's a DD6. And I am in same boat. I"m a logical person? If it will hit 5000 rpm in 4th. Then it should hit 5000 rpm in 5 and 6th.? I always try to get rpm up past 4000 to make sure its not struggling (LUGGING) but doesn't seem to matter? Weird.

I guess I should say too that at that point its way past the legal speed limit so in reality I shouldn't be running it there anyways. Frustrating thing though to have other bikes go right by me.

My guess is gearing, had that same problem on a 96 Fatboy would haul butt going threw the gears but if I was cursing in 5th it wouldn’t pull steep hills or pull over 75 with out down shifting and then would not hold the speed when I would shift up to 5th. After dumping a lot of money into the motor and changing gearing that didn't help I traded the bike off.

Okay. Thanks for ideas. It pretty much has to be something related to final gearing? As I said , I'm no lightweight but my wife is quite small (go figure) and usually my friends ride two up as well. The one guy is maybe 80 pounds lighter but his wife well...Lets just say we are pretty much equal when riding two up. HAHAHAH especially cause he's riding an ultra classic loaded up with toys. I actually have a spare set of heads i picked up like new (maybe 100 miles on them) cheap. I guess I should look for a trustworthy dyno place and see what I can find out. Do these things have speed govenors? It was an old cop bike ? Maybe they turned something off? LOL I was just thinking I could get someone lighter to test ride it and see if they can break through that barrier.

You have 95", SE211 cams, stock heads and ignition... I would recommend going to an aftermarket box with adjustable advance curves. Your current box is setup for an 88" with stock cams. Take advantage of the potential in the additional inches and larger cam.
A good port job or head swap would wake that motor up even more.
I had a 2KRK 95" MM, true duals, heads, cams, PCIII etc and pulled 100 /100. It was our twinkie mule at the shop.

In another post you said Road King, so I'm assuming big windshield & even without it, aerodynamics is a major factor. Just for example, an 883 Sportster picks up 7 mph with just the addition of a small "cafe racer" fairing & the rider laying down behind it.

Aero drag increases @ the cube of velocity - in other words, to go twice as fast you need 8 times the HP & to go just 10% faster you need 33% more HP. Without much wind resistance @ lower speeds & with the "torque multiplication" factor in the lower gears, a properly-tuned engine will pull to redline just fine - but add the aero drag, the direct 5th gear ratio & the overdrive 6th & you need a LOT more power.

You're experiencing what we call "hitting the wall" - getting to the point in the higher gears that the bike just doesn't have enough power to keep on accelerating. Sounds like your peak torque is @ 4000 rpm & at that point, a bit more more power is pretty much irrelevant - it would take moving the powerband up for a major HP increase, and/or a major reduction in aero drag to make a considerable difference. The 1st choice is very expensive & the 2nd not the least bit practical :witsend:

So I'd say enjoy your ride without spending a gazillion dollars - as you said in another post, trying to run faster in the higher gears is over the speed limit anyway.

Thanks for feedback. Having visited a few other Harley sites and read how other have "hit the wall" as well at about the same spot and taking into consideration their thoughts I would agree that probably it's a few factors coming into play.
1. The gearing (with added Baker six speed DD6)
2. The wind. I know when riding the bike with the windshield removed its all I can do to keep riding when I get much above 60 mph (100 K in Canada). I usually have the removable windshield on while highway riding.
3. The weight and size of the rider. I am 6'7" and weigh over 320lbs. So I am like 2 up even when riding alone. Also I am Tall and wide so I push alot of wind just in physical size.
So that being said. I have no need to ride at those speeds anyways other then the occasional blast with your friends down an empty highway for fun. Well other then hauling butt across Montana to get to Sturgis. Hahhaha

Guess I will live with it at least until I build mine into a 103. Us big guys need the extra power just to pull us around. Hahaha I'm just thankful my wife is a small woman or we'd have a bigger problem.