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Stock Breva 750 - Low Fuel Mileage (high 30's low 40's) Time for upgrades

willard

Just got it firing!
Joined
Oct 25, 2017
Messages
4
Location
atlanta
I purchased a Breva 750 with 30,000 miles on the clock. After replacing the battery, it starts and runs really well.

I noticed that after commuting to work for a few weeks and doing a few trips, fuel mileage is considerably lower than what others have mentioned. I rarely see above 45mpg (no ethanol) and even high 30's (E10) is normal. My commute to work is about 50 miles round trip, so I'd really like to be able to go more than three days without filling up.

As far as I know, the bike is stock, but it HAS been tampered with. The mufflers have holes gashed into them under the heat shield. I think someone thought it would make the bike louder. I'm not sure it did anything.

Spark plugs read rich, as the metal tab is white and the surrounding area is very black. When the bike is running I can smell gasoline. Perhaps the ecu was fiddled with to run rich by the same guy who gouged the pipes.

Performance seems okay. I rode a v7ii and a v7iii, and both seemed more peppy than my Breva, but not to a huge degree.

I'm wondering if a simple ECU re-flash and TPS rest/ throttle body sync will resolve this. I'd love upgraded performance, but I'm mainly looking to dial the MPG back up. This is my first experience with a fuel injected motorcycle, so I'm not sure what programs are required, but I think guzzidiag is the way to go? Do I just need to download the program and use a USB to connect to the ECU? Are stock or stock improved maps available cheaply? I've considered the guzzitech re-flash, but the expense and the time spent without my ECU seems a bit much for me at this time. Maybe it is the way I will end up going, but first I'd like to try easier and cheaper alternatives.
 
Congrats on the B750, and welcome to the Forum. Start with knowing all of the baseline settings. Having holes in the exhaust system will disturb the fueling of course, outside giving a faulty reading to the 02-sensor if that is still in place(?).
I do not allow discussion of Diag on this Forum, see; https://www.guzzitech.com/forums/threads/guzzidiag-notice.16329/
I sell a commercially supported Diagnostic software on this site; https://www.guzzitech.com/store/product/tr-alaris/ - but at that point you are halfway there to my flash tool, which Alaris does not offer ECU map options.
Good luck with it outside of these items... but do make sure the bike is in spec on all other items, and the computer has no faults.
 
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