StromTrooper banner

1 - 19 of 19 Posts

·
Registered
Joined
·
68 Posts
Discussion Starter #1
Folks
I was getting around 50mpg, then suddenly I dumped down to about 41 and can't figure out why. everything runs well, and I am not doing anything diff gas-wise or right-hand-wise or terrain-wise. So I think I'll run some strong Fuel Injector cleaner for a tank and see what happens afterward.

Any suggestions on which chem to use, and how concentrated?
z
 

·
Registered
Joined
·
68 Posts
Discussion Starter #3
Have you checked the air filter?

yep. first thing I did, and pulled the plug to check. color looks fine, and the filter was average.. just dry dust and the odd bug. I cleaned it out and put back in.... it was new about 1500 miles ago. whilst there I pulled the boot off. made no difference whatsoever. 41mpg.
 

·
Premium Member
Joined
·
1,135 Posts
I'm having the same problem at the moment. Before I was getting 52-55mpg, and now I'm getting between 41-44. I think that we might still be on winter gas (??) and I've been filling up at different pumps, and each one fills to a different level. The bike runs great, but I want my gas mileage back! I've checked to make sure nothing is dragging, brakes or etc and all appears to be well. The bike was running 50+mpg around 15k miles, and now I've just passed 16k. Oil, filter, and plugs all appear to be just fine. All are new within the past 1500 miles.

Would a throttle body sync cause this? (I'm paranoid and can't check it at the moment).

What kind of trouble could cause such a large drop in mileage?

Thanks!
Eric
 

·
Registered
Joined
·
68 Posts
Discussion Starter #5
nawwwww...
TBS is overrated.
when you sync TB's, there are a lot of variables:
- how warm/hot is the engine?
- while warming is it sitting still or moving? there's a diff in the heat of the rear versus front cyl, and it affects the vaccuum reading
- is the rear cyl OVERheated???? gotta hit the seam
- check at idle, at 4000rpm, at 60000 rpm?????
- make sure the tubes are equal length and take time to tap the air out of the manometer.
- make sure you don't just sync at one rpm setting [see above]

get the picture?

I'm having the same problem at the moment. Before I was getting 52-55mpg, and now I'm getting between 41-44. I think that we might still be on winter gas (??) and I've been filling up at different pumps, and each one fills to a different level. The bike runs great, but I want my gas mileage back! I've checked to make sure nothing is dragging, brakes or etc and all appears to be well. The bike was running 50+mpg around 15k miles, and now I've just passed 16k. Oil, filter, and plugs all appear to be just fine. All are new within the past 1500 miles.

Would a throttle body sync cause this? (I'm paranoid and can't check it at the moment).

What kind of trouble could cause such a large drop in mileage?

Thanks!
Eric
 

·
Premium Member
Joined
·
1,981 Posts
nawwwww...
TBS is overrated.
when you sync TB's, there are a lot of variables:
- how warm/hot is the engine?
- while warming is it sitting still or moving? there's a diff in the heat of the rear versus front cyl, and it affects the vaccuum reading
- is the rear cyl OVERheated???? gotta hit the seam
- check at idle, at 4000rpm, at 60000 rpm?????
- make sure the tubes are equal length and take time to tap the air out of the manometer.
- make sure you don't just sync at one rpm setting [see above]

get the picture?
Wow, all that? Who knew! I bet you are putting more thought into it than anyone else here. Just plug your tubes on and do it.
 

·
Registered
Joined
·
68 Posts
Discussion Starter #7
already done.
thanks for the valuable contribution
 

·
Rjsurfer
Joined
·
539 Posts
Could it be the gas? different brand or blend?

Ron W.
 

·
Administrator
Joined
·
16,794 Posts
nawwwww...
TBS is overrated.
when you sync TB's, there are a lot of variables:
- how warm/hot is the engine?
- while warming is it sitting still or moving? there's a diff in the heat of the rear versus front cyl, and it affects the vaccuum reading
- is the rear cyl OVERheated???? gotta hit the seam
- check at idle, at 4000rpm, at 60000 rpm?????
- make sure the tubes are equal length and take time to tap the air out of the manometer.
- make sure you don't just sync at one rpm setting [see above]

get the picture?
Not sure I agree with you on that!;) You are the one who is creating all the variables. I just did a TBS adjustment for a member last weekend, try to convince him that "your" variables had a negative effect.

I am not sure why you guys are getting the sudden drop in mileage. How hot has it been, I see you guys live out West. My mileage honestly doesn't fluctuate much, guess I am lucky.
 

·
Registered
Joined
·
6 Posts
mileage

I don't know where all of you are but here in Kentucky we change to a winter blend which makes EVERYTHING suffer. If I've been riding all winter I will see a change come about sometime in April...maybe you suffer from the same!
 

·
Premium Member
Joined
·
1,135 Posts
I don't know where all of you are but here in Kentucky we change to a winter blend which makes EVERYTHING suffer. If I've been riding all winter I will see a change come about sometime in April...maybe you suffer from the same!
Thats my guess woody. I just don't know when they switch back over in our area!
 

·
Registered
Joined
·
1,446 Posts
I think you may want to look at the fuel . Ethanol is added a lot to fuel at different rates, it dose not give the same MPG. I have read were E85 fuel can give 35% less fuel economy ( how true this is ?? ).
 

·
Premium Member
Joined
·
1,135 Posts
Hey everyone. I thought I would update this thread! My mileage is back up to the 55mpg I'm used too. Before I had been using ethanol 89 (10%) and figured out that was related to the horrible mileage. Now I'm back on straight 87 and its working great. The 89 is the cheapest gas around here, and I had just been picking the cheapest figuring it was ok. 10 cents on the gallon does not begin to makeup for the %20 loss in gas mileage. If anyone else runs in to this I"d look at the fuel first. Ethanol sucks!
 

·
FORUM GODFATHER.....R.I.P. PAT
Joined
·
38,048 Posts
I don't see how you can live in the Chicagoland area and get gas without ethanol. +1 for top tier gas. Higher octane than 87 is usually not a good idea. It burns slower and throws off proper spark timing.
 

·
Premium Member
Joined
·
1,135 Posts
Maybe it all has ethanol but the stuff I was buying had the 10% sticker next to it. The 87 does not. Right now I'm in the quad cities, but in the Chicago suburbs you can also get gas without the ethanol sticker next to it. At least at Mejers, 7-11, BP and Citgo. I might try the top tier stations instead.
 

·
Registered
Joined
·
1,852 Posts
I doubt injector cleaner will solve your issue. You have something else going on. Tire pressure, added something creating more wind resistance, Throttle body sinc perhaps, airfilter, plug leads and plugs, fuel blend, riding style, christmas snacks? Brakes dragging, or something creating more resistance?
I would verify all the above, change fuel to a mid grade and rechack milage. I think this is the poorest milage I have heard.
 

·
Premium Member
Joined
·
1,135 Posts
Isn't there a sensor that detects what gear you are in and then adjusts the fuel map accordingly? What if the fuel maps are incorrect?
 

·
Registered
Joined
·
1,446 Posts
What did I say ? Ethanol is a rip off in a big way . It will destroy fuel pumps unless they are made with correct seal that resist it . We have found out the $$$$$$ way down under even when it says 10% avoid it many cases of much higher been found sold as 10% ( different tax rate on ethanol so it makes cheaper petrol ).It has been know to destroy a new plastic petrol tank in 10 months on a car downunder ( they found out about ethanol being added to fuel after the government let it happen without informing people !!! ) .It is not enviormently friendly .
 
1 - 19 of 19 Posts
Top