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General Category >> Rubber Side Down! >> Fuel milage
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Message started by Wiley on 02/07/20 at 13:55:41

Title: Fuel milage
Post by Wiley on 02/07/20 at 13:55:41

I don't know if anyone asked this or not I couldn't
find the subject on site, but why would my bike a
2007 s40 with a Dana muffler, no carb mods, stock
size tires. It has been getting about 60 mpg + or -
2 or 3, lately it's half that. What give? tire pressure's
good, engine is strong and sounds good. I'm 6'1",
215lbs the bike will do 85+ flat & level and pull a
pretty steep hill out of the canyon I live in at 70mph.
A friend of mine said it could be a gasoline issue.
Could gasoline be the issue? Any help Is appreciated.

Thanks

Title: Re: Fuel milage
Post by stewmills on 02/07/20 at 14:04:23

If it is half, you better check your oil for fuel. Maybe a failing petcock diaphragm and if that is coupled with a failing float needle, you lose fuel into the crank case!

Title: Re: Fuel milage
Post by verslagen1 on 02/07/20 at 14:19:59

525544564C484D4D52210 wrote:

If it is half, you better check your oil for fuel. Maybe a failing petcock diaphragm and if that is coupled with a failing float needle, you lose fuel into the crank case!

abbalootly, also if you have a leaky float valve, it'll do the same thing if you also have a leaky petcock as well.
And depending on how you park, gas can be either in the case or the airbox.
Check the carb for a leaking bowl gasket

Title: Re: Fuel milage
Post by Wiley on 02/07/20 at 14:27:34

Thanks for the response. I just went out and checked,
level hasn't changed and no smell of gasoline.

Title: Re: Fuel milage
Post by Wiley on 02/07/20 at 15:00:17

I checked the air filter this morning thinking it
might be to dirty, but it was a lot cleaner than
I expected, tapped it on concrete and little dirt
and a little plant & bug stuff come out, held it
up to the sun and it looked almost lake new.
The air box was dry with dust/dirt at bottom
that's it. Bike is parked on level ground under
my patio.

Title: Re: Fuel milage
Post by Wiley on 02/07/20 at 15:56:51

The issue my friend was thinking about was
not what happened in the system, but how the
blend is burned, with all the winter cems and
Ethanol, (at 10%) here in Southern New Mexico,
at about 5000".

Title: Re: Fuel milage
Post by Serowbot on 02/07/20 at 15:58:22

Somebody's siphoning your gas at night... ;D

Title: Re: Fuel milage
Post by batman on 02/08/20 at 16:27:51

Were you getting higher mileage at a lower elevation or were you always at 5000 ft ? Air is thinner at your higher elevation and requires less fuel , your bike may be running rich and wasting fuel, check your plug for soot ,tune your fuel screw , try a smaller pilot jet (50) rather than the stock 52.5
You can't believe the stock speedo 60mph can be more like 55 with the stock rear tire .