Fuel Mileage after the CO adjust and the TBS

[jajpko]

One of the inmates on the other forum, inferred that his mpg had dropped after the adjustments.
Has anyone that has done this, noticed any change for the worse?
I did the CO adjustment today and set the cylinders at +3. Have not had a chance to try it yet, and the tank is full so will have to wait on the TBS settings until Thursday.

Just wondering, as I have not heard anything on this.
Thanks

 

[Yamaguy55]

I've done both (CO to +6) and my MPG has gone from 44-45 to 47-48. During this time, the weather has cooled somewhat, and the engine has no doubt broken in more.
But the changes have improved off-idle throttle response, which is often the throttle opening used. I guess at this point I can't prove the mileage is better, but the light throttle performance has.

 

[jajpko]

I've done both (CO to +6) and my MPG has gone from 44-45 to 47-48. During this time, the weather has cooled somewhat, and the engine has no doubt broken in more.
But the changes have improved off-idle throttle response, which is often the throttle opening used. I guess at this point I can't prove the mileage is better, but the light throttle performance has.

I also notice the off throttle response was better at +3. After I burn a tank and set the TBS, I'll see where I'm at on MPG.
From what you say it looks good.

 

[Yamaguy55]

All of my recent Yamahas, which are EFI, tend to be rough, or even coarse, during hot weather. I'd like to use a different term, but I can't think of one. They vibrate more, and are otherwise not smooth feeling. I think the ECM is set to lean them out to the point of roughness. I also think that due to this lean setting, you tend to use more throttle to accomplish the same things, which leads to poor fuel mileage. When the weather cools down, this tends to go away somewhat. By messing with the CO adjustment, the mixture was enriched just enough to eliminate some of this. The Tenere still has the 270 twin feel, but some of the roughness is now gone. I find on the roads I ride, I use very light throttle quite often. That puts me into the area I just adjusted. WOT will show little to no effect of sync or CO, but almost closed will, at most RPMs. If it doesn't work out, I can always put it back.

 

[Checkswrecks]

It'll be interesting to see what mpg experience people have, and also whether their bikes like regular gas better. It may be that this is simply the difference to some of the non-US bikes, where people have been running fine with regular.

 

[thagua]

I got rid of the catalyzer and had to adjust the CO settings to +5 on each cylinder ... still not satisfied ... will raise it to +6 after I adjust the idle settings and carb sync with the Harmonizer ... I use 95 octane gas instead of the recommended 97 ... in Bolivia you find 81 ... lol
Cheers,
Roberto

 

[colorider]

I have not officially checked mine (I will fill up in the morning), but for my first run since doing the TBS (but not the CO adjust) my mileage appears to be off from previous tanks + my throttle response is off + I seem to have more vibration at 4K. Not a good result so far and I'm wondering if it's the higher elevation or if I did something wrong. As soon as I get home Sunday, I plan to return my throttle body settings to as close as I can estimate and see if things improve.

I'm open to other ideas if anyone has some!!!

Rod

::010::

 

[SisuTen]

I have not officially checked mine (I will fill up in the morning), but for my first run since doing the TBS (but not the CO adjust) my mileage appears to be off from previous tanks + my throttle response is off + I seem to have more vibration at 4K. Not a good result so far and I'm wondering if it's the higher elevation or if I did something wrong. As soon as I get home Sunday, I plan to return my throttle body settings to as close as I can estimate and see if things improve.

I'm open to other ideas if anyone has some!!!

Rod

::010::

Maybe doing the CO would help. That seems to be the combination people are having luck with.

I ordered a Harmonizer and when it comes, I'll be doing the CO and the TBS. I could come over and screw up your bike for you before I do it to mine ::025::

Paul

 

[Yamaguy55]

Your elevation may have something to do with that. Keep in mind the TB adjustment allows more air past the throttle plates, making it leaner. The ECM and O2 sensors should compensate for some of it, but not ball of it. I would try the CO and see what improvement that brings. CO = mixture (sort of) and TB sync is the equal of the mechanical adjustment we used to do, but now merely allows more air to bypass the throttle plates, rather than actually opening them.

After the sync, I first thought I had more vibration, but it is more properly power delivery. It broadened the throbby part in the powerband. With more miles, it has smoothed out quite a bit; I added almost 1K after the sync. I did the sync first, and the CO second. I should have done it the other way around. Mixture will affect the sync.

I intend to resync the TBs this weekend, because I really did them backwards. Vibration and coarseness on my other FI bikes has always been related to hot weather, and the ECM leaning out the mixture to compensate.

My WR250R was pretty rough and buzzy until about 3000 miles, much smoother since. I really spin that up when I ride it, unlike what the Tenere does. More often rhan not, i'm running 2000-4000 rpm on the Tenere, the WRR, 6000-9000 rpm. With the under stressed nature of the Tenere, it may take 10K for a good break-in. My FZ took about the same time or more to settle in as the WRR. At 10K, I would expect the Tenere to be fully broken in.

I have not officially checked mine (I will fill up in the morning), but for my first run since doing the TBS (but not the CO adjust) my mileage appears to be off from previous tanks + my throttle response is off + I seem to have more vibration at 4K. Not a good result so far and I'm wondering if it's the higher elevation or if I did something wrong. As soon as I get home Sunday, I plan to return my throttle body settings to as close as I can estimate and see if things improve.

I'm open to other ideas if anyone has some!!!

Rod

::010::

 

[jajpko]

I have not officially checked mine (I will fill up in the morning), but for my first run since doing the TBS (but not the CO adjust) my mileage appears to be off from previous tanks + my throttle response is off + I seem to have more vibration at 4K. Not a good result so far and I'm wondering if it's the higher elevation or if I did something wrong. As soon as I get home Sunday, I plan to return my throttle body settings to as close as I can estimate and see if things improve.

I'm open to other ideas if anyone has some!!!

Rod

::010::

Rod, I did the CO at +3 and it smoothed the idle. Have not done the TBS yet, plan on the morning. I like the way the engine idles and leaves from a stop except for a slight stumble. And I do mean slight..

Today my mpg was at 45.6 and I am still breaking in the engine.

I think when I do the TBS sync I will start with 1/4 turn on the painted screw and sync to that. Ride for awhile and see how it feels. I already have a dang good vibration at 4200 and would hate to bring it into the lower range. Just my observations.

 

[colorider]

Thanks for the feedback. I'll be taking a ride today down Phantom Canyon and then back up the Shelf Road (all dirt except for getting there and back) and it will give me the chance to evaluate it a bit more. I originally did the 270 degree setting and then balanced to that, but maybe I should have gone a little less and tried it before going more. When I get home I think I will first do the CO adjustment to +3 and see what it feels like and then back off the TBS some if need be.

Rod

 

[Koinz]

Thanks for the feedback. I'll be taking a ride today down Phantom Canyon and then back up the Shelf Road (all dirt except for getting there and back) and it will give me the chance to evaluate it a bit more. I originally did the 270 degree setting and then balanced to that, but maybe I should have gone a little less and tried it before going more. When I get home I think I will first do the CO adjustment to +3 and see what it feels like and then back off the TBS some if need be.

Rod

I turned them out 180 degrees (half a turn). I guess all you really need is enough to be able to sync them. the 270 is a starting point only.

 

[Ron_Luning]

According to the dash readout I'm getting 38.9 mpg. That is pretty much the same as I was getting before the airscrew and CO adjustment. I got around the same on my V-Strom 650, so that's pretty good for almost twice the displacement.

 

[Yamaguy55]

According to the dash readout I'm getting 38.9 mpg. That is pretty much the same as I was getting before the airscrew and CO adjustment. I got around the same on my V-Strom 650, so that's pretty good for almost twice the displacement.

Why the low mileage? Lots of stop and go? Due to the excessive rainfall, and the resultant flooding, I've been using the bikes as a means to get around. Today was the Tenere's turn. I was driving all around our old Fench and Indian War era town, and I still am running above 46MPG. That also includes mountain climbing, idling in traffic, and all of the narrow back streets of town. This is down from the 47.8 I was getting last weekend. And I don't spare the horses for acceleration.

 

[SpeedStar]

My average is 38 too. I tend to ride it hard though. I have gone through over half the tread on my Tourances in 2000 miles.

 

[jajpko]

My average is 38 too. I tend to ride it hard though. I have gone through over half the tread on my Tourances in 2000 miles.

Do you have your side cases on? I had mine on and a new shield and the mpg went to hell. Pulled of the cases and back up.

 

[dcstrom]

Do you have your side cases on? I had mine on and a new shield and the mpg went to hell. Pulled of the cases and back up.

I did a trip to PA a few weekends ago, solo and just a duffle for luggage. Wet coming back to DC, so riding pretty gently, 46mpg.

Last weekend, same roads, wet again! But this time two-up with Jesse luggage. 46mpg. Pretty impressed.

Trevor

 

[colorider]

My mileage had been in the upper 40's and lower 50's (we always do better here at higher elevation) but since my TBS and resulting poor performance, my mileage has dropped to the low 40's. Yesterday was a more leisurely ride on some dirt roads and 65 or so on the paved part and it "looks" a little better - will know more when I fill up later today.

 

[rem]

When you guys calculate your mileage, do you base it on the electronic readout regarding miles to the gallon or whatever, or do you do it based on how much gas you actually put into your tank? My digital readout on my recent trip showed me getting about 50 miles to the U. S. gallon on the highway. I was loaded and wasn't trying to be conservative. Just normal driving, about 70 mph average I figure. Just curious which is the more accurate method.


I'm back, by the way. You miss me? Oh stop it. NO, I'm fine. really. Oh quit, you're embarrassing me. R

 

[glazier]

Just a thought....maybe the California Super Tenere gets less MPG due to added smog devices (cannister, etc)
I'm also getting 38 mpg (calculated by miles / actual gas used)