Fuel mileage issue
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Cruiser
Joined: Oct 2013
Posts: 237
Likes: 3
From: Kissimmee, FL
Fuel mileage issue
Recently I had some work done to the bike. Nothing major, I broke an exhaust stud while trying to fix an exhaust gasket that was leaking. The bike sat with the battery out for almost a month. Gas mileage was decent before all the work and the exhaust leak. The tune was good and had little to no exhaust pop. So after the work I noticed the bike was popping a lot on decel. So I put in a new tune and it is minimal now
Here's the deal...
Even a bad tune would give me 35mpg maybe 30mpg...But I am getting only 20mpg in the city and just barely 30 or so mpg on the highway. I've tried different tunes and checked the spark plugs and it doesn't show signs of running rich or lean.
Any ideas what could cause this horrible gas mileage?
Bikes got about 19K miles on it.
Here's the deal...
Even a bad tune would give me 35mpg maybe 30mpg...But I am getting only 20mpg in the city and just barely 30 or so mpg on the highway. I've tried different tunes and checked the spark plugs and it doesn't show signs of running rich or lean.
Any ideas what could cause this horrible gas mileage?
Bikes got about 19K miles on it.
Last edited by hitman1267; Nov 21, 2016 at 07:31 AM.
Grand HDF Member
Joined: Jul 2016
Posts: 4,384
Likes: 8,742
From: Texas
Power Vision.., I'm assuming
Did you delete the old fuel tables..., as you reprogrammed - so it could build up new ones
Exhaust leak would cause it to build false ones, I believe..., then tying to run off them may be jacking the MPG
Ghost
Did you delete the old fuel tables..., as you reprogrammed - so it could build up new ones
Exhaust leak would cause it to build false ones, I believe..., then tying to run off them may be jacking the MPG
Ghost
Thread Starter
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Cruiser
Joined: Oct 2013
Posts: 237
Likes: 3
From: Kissimmee, FL
I got a Power Commander V
Grand HDF Member
Joined: Jul 2016
Posts: 4,384
Likes: 8,742
From: Texas
My next assumption - don't have the wide band O2 sensors for auto-tuning
Suggestions (in no particular order)
Call Dynojet..., see what they say
Take it to a dyno (and good tuner) - see what the actual readings are
(Dyno is a really good diagnostic tool..., and way to establish a correct baseline)
==========
This way - I'm not suggesting useless bullshit that's causing you to chase your tail in circles
Do one or both above - let's see what shakes out - then we can go from there
Ghost
Suggestions (in no particular order)
Call Dynojet..., see what they say
Take it to a dyno (and good tuner) - see what the actual readings are
(Dyno is a really good diagnostic tool..., and way to establish a correct baseline)
==========
This way - I'm not suggesting useless bullshit that's causing you to chase your tail in circles
Do one or both above - let's see what shakes out - then we can go from there
Ghost
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