Question about Road King performance
Elite HDF Member
Joined: Oct 2006
Posts: 4,128
Likes: 27
From: florida swamp
For those asking about dyno numbers, I've scanned and attached the map. Also, it does have the Screaming Eagle breather installed, forgot that. Thanks. I agree, this is all subjective. It may even be something I'm doing, shifting too soon or something like that. I appreciate all the feedback I've gotten, thanks again. Also, I see looking at the dyno sheet this was done in 2010. I'm new to the fuel injected/dyno tuning world, is this something that should be done regularly? I'm assuming, though not positive, that the motor work, etc. was done prior to this dyno testing.
Seasoned HDF Member
Joined: Apr 2012
Posts: 9,975
Likes: 5,213
From: Michigan
5 speed? My '03 hates over 70 riding, mileage also drops drastically from around 45/48 to less then 40 crossing the magic number 70mph. The six speed bikes don't seem to have the issue as I have seen in buddies bikes on long rides. Have seriously considered a Baker 6 speed box to get that added little gear ratio but concerned the engine, mine is a 88ci, may not have enough to pull it well.
THe 1550 kit did the job for me. The T/C 88's with the 5pds are great bikes for cruising but they are not geared for expressway speeds.
My Ultra (with OEM trans) was taching about 3500 RPM's at 80 MPH.
With the Baker DD6, it tach's about 3000 RPM's.
I will say one thing about going with a 6spd, don't count on increasing your MPG's.
With the lower RPM'Syou just want to go even faster and cruising at 80 MPH with a 6spd will use as much (or possibly more) fuel as cruising at 70MPH with a 5 spd.!
My Ultra get's about 40 MPG's if I stay at or under 70 MPH.
Once I pass 70 MPH, the MPG's start dropping and at 80 MPH, it drops to about 33 MPG's.
Ths point is, going faster costs more.
Outstanding HDF Member
Joined: Feb 2007
Posts: 2,710
Likes: 6
From: Spokane, WA.
My bike runs great at speeds. I found out you can't set cruise above 90mph. If I could I'd cruise 100mph all day. Furthermore my mileage is ****. These guys talking 48mpg must be doing something I'm not. I have a 6 gallon tank and I'd never get >250 miles to a tank...never in a million years.
My engine mods and heavy right hand may be a factor though bahaha
My engine mods and heavy right hand may be a factor though bahaha
I got some ping issues will get corrected this week. Timing is everything LOL.
for just a minute...Does the RKC have a 6 or 5 gallon tank? The specs on Harley's site show 6, but I have run my tank to the point that the computer doesn't even show miles....it shows "LO" and the most I can get in it is 5.2 gal. My Power Vision shows that I am averaging 51 mpg (and based on a 5.3 gal tank, that's accurate).
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