I recently put a Harley race tuner with a HD big air kit and Rinehart true duals on an 07 SE Roadking. Before the mods the bike averaged 40 to 42 mpg. After the mods
the mileage dropped to an average of 32 to 35 (32 more than 35). I had the dealer double check the mapping and they insist the mapping is correct. When I question the mileage the dealer tells me they have mapped the bike to run a little on the rich side to help keep the engine cooler and does not seem to think the mileage should be an issue.

I'd be perfectly happy with 36 to 38 mpg. Is this unreasonable? Is my dealer a little to conservative?

 

Have same setup. Get 40 mpg.

 

The dealer is snowing you! I have a 95" Big Bore, with cams, SERT, and Rinehart TD, and I'm getting over 40mpg. Your problem is in the fuel/air mixture numbers. If the dealer mapped the F/A, did they give you a print out? Going with SERT means the dyno person needs to do a bit more fine tuning, separately for both front and rear cylinder. This means they need to do a base mapping, run your bike, shut it down, modify mapping, load mapping to ECM, start your bike up to normal temp, then check the mapping at various throttle positions. If the actual dyno was done, they should have given you a print out. Showing both HP and TQ as well as F/A numbers. Sounds to me like all the dealer did was loaded a mapping from another bike to yours. If F/A is adjusted correctly, you should be getting about 38-40mpg.

 

Is the SE Race Tuner adjustable by throttle and RPM ? I have a PCIII and was getting 36-39 mpg. I adjusted the numbers in the cruising range and now get an average of 46 mpg for daily riding and 49 mpg for highway riding.

Ride Safe,

Mike

 

With my new 103 /SE 255 cams/ SE Slipons /SERT I got 42mpg on my first tank and I wasn't taking it easy. The worst I've gotten with either motor was 2-up 80mph riding and it was 40mpg . Sounds like you need a good tuner

 

I also had the same experience on my 05 Ultra. I have to admit the bike runs GREAT, and I gained 12 hp and 12 lbs torque. It runs so well, that I am hesitant to go back and complain about the mileage. I will be watching this thread to see what you find out.

 

I am told that the HD race tuner has adjustments for the air-to-fuel ratios at various RPM intervals. I am also told that one can adjust the air-to-fuel ratios on the PCIII but at a greater number of RPM intervals. Not sure how big an advatgae that is.

 

The dealer did hand me a print out from the Dyno run. The air-to-fuel ratio showed to be 13. Theparts guyat another HD Dealership told me the optimal ratio was something like 14.07. If he is right it confirms what I suspected. The thing is running to rich.

Decided to letthis otherdearership take a stab at tuning the bike. I must say I was a bit concerned when the service writer told me that the 110 really drinks the gas and 32 mpg may not be that much out of line. Maybe the dealerships should start requiring their service writers to do some reading on the forums. Wanted to speak with the guy doing the tuning but he was tied up in the dyno room. At any rate, I told the service writer to let the parts guy tune it if the regular tunershared his opinion about acceptable mileage.

Thanks for the reply.

 

124" RK 33mpg 4500 miles on motor
155" RK 28 mpg ,new motor
Both bikes are carbed.

 

I HAVE A 2006 ROAD KING NESS BIG SUCKER AND OPEN PIPES KINDA.. GET ABOUT 100 TO 120 TO A FULL TANK I THINK MY MILEGE SUCKS PS ... ITS CARBURATED ANY HELP