R1100GS high mpg

[~Stef~]

Drop the sarcasm because YOU wrote this.....

Think i'll keep it thank you, what dip stick would constantly run his bike dry

Anyhow, he lives just out side Wrexham North Wales and his commute is dual carriage way and country roads. Rather than stop start city driving.

Going back to what I said at the start of the thread, theres something amiss cause when starting from cold his bike stinks of petrol and blows black exhuast smoke. Its fine once warmed up. oh and his plugs are on the rich side of brown.

 

[roddy]

Stef,

I would check the CO pot is set correctly, if this was wrong I would expect a low MPG,

for what it's worhth my stock R1100GS ran well on the following pot settings

1 & 3 - 1.03K ohms
1 & 2 - 203.7 ohms
2 & 3 - 834 ohms

unfortunatly I don't have the 1100GS anymore but these figures are from my records


Also worth checking for a sticky choke cable

cheers

 

[Invicta Moto]

... gives about 10 Miles/litre and it makes little difference if it's ridden 'briskly' or not. Just pootling around gives a better return but who wants to do that

My 1150 does about that too, in fact I always expect to get more than 10:1 miles to litres. Recently not getting involved in any silly-boy stuff means I'm getitng ovber 50mpg on the run up the M20/M25/A2 to work every day.

I fuel up every night at the Shell in Upper Street N1 and put in about 13.8 lits for 152-155 miles... I ride quite briskly and have decided to cruise at under an indicated 90 nowadays!

 

[~Stef~]

My 1150 does about that too, in fact I always expect to get more than 10:1 miles to litres. Recently not getting involved in any silly-boy stuff means I'm getitng ovber 50mpg on the run up the M20/M25/A2 to work every day.

Thats the same as my 1100 gets normaly average 45mpg can get over 50mpg if pootling about.

 

[~Stef~]

Stef,

I would check the CO pot is set correctly, if this was wrong I would expect a low MPG,

for what it's worhth my stock R1100GS ran well on the following pot settings

1 & 3 - 1.03K ohms
1 & 2 - 203.7 ohms
2 & 3 - 834 ohms

unfortunatly I don't have the 1100GS anymore but these figures are from my records


Also worth checking for a sticky choke cable

cheers

Cheers for the info i'll pass it along.
Doesnt the choke cable just open the throttles slighlty to increase tick over ?

 

[roddy]

the choke cable will act on the butterfly thats in the throttle body, so if the choke cable wasn't returning properly the butterfly wouldn't be at it correct rest position, so when you pal is using the bike for commuting, when at idle it'll be using more fuel and this may explain why when on a constant throttle he gets good MPG

 

[Big Jets]

I was up north last year on my 1997 1100 .Fully loaded and with the Wife on the back .I got 185 miles before i found a petrol station.I was sweating though.Because the light must have been on for a good 30 miles or so.

 

[Steptoe]

t when at idle it'll be using more fuel and this may explain why when on a constant throttle he gets good MPG

If the throttle cable WAS sticking the bike wouldn't idle. it'll be revving high.

 

[chas]

own a 1998 1100 used to think the mpg was bad flat out on moway 120 till light came on about 170 commuting but when touring with mate on on 1150gsa i put the same amount of fuel in and he recons he was getting 52mpg did all the usual checks and it never changed suspect speedo was very inaccurate

 

[roddy]

If the throttle cable WAS sticking the bike wouldn't idle. it'll be revving high.

my logic here was if the cable was sticking and it wasn't noticed during a service could you not tune out the high idle using the brass screws ?

but I will bow down to your superior knowledge on such things, it was only an idea

 

[~Stef~]

own a 1998 1100 used to think the mpg was bad flat out on moway 120 till light came on about 170 commuting but when touring with mate on on 1150gsa i put the same amount of fuel in and he recons he was getting 52mpg did all the usual checks and it never changed suspect speedo was very inaccurate

Mates bike has a calibrated speedo from a police RT, tho its calibrated for a 18" wheel so it reads slow for speed, but mileage is the same as my 1100.

New Years day I was coming back from Glencoe and all the petrol stations were closed, RID had no bars on it for 50 miles no sign of the fuel light ended up crawling along at 40mph made it back to the first petrol station with gas in the tank.

 

[(RIP) Kaister]

Mates bike has a calibrated speedo from a police RT, tho its calibrated for a 18" wheel so it reads slow for speed,

so that'd be less accurate than the correct speedo then ?

i think herein lies the problem.


get decent pushbike digital speedo - measure the circumference of the tyre - put those figures into it and report back.

better than any calibrated speedo for the wrong bike and even the original speedo - cos they have the wrong teeth in the drive.

 

[~Stef~]

so that'd be less accurate than the correct speedo then ?

i think herein lies the problem.

Dont think so, firstly his odometer reads the same as mine within a mile or so over 200 miles.

Secondly it doesnt explain the smell of petrol or the black exhaust smoke

 

[Hambo]

MPG

I had a similar problem with excessive fuel consumption with my '95 1100 and found the CO pot' to be the culprit.

With the pot' off, and borrowing a multimeter, I established one full turn to equate to 66 ohms. (Measuring resistance between 2 & 3). Useful for later fine adjustments without a multimeter. (I'm travelling in South America at present and don't carry a multimeter.

With helpful advice from Roddy, I ended up starting at a setting of 840 ohms, achieving an average figure of 7.6 ltrs / 100km. I later increased the resistance to 873 ohms by turning the pot' screw by half a turn in a clockwise direction (1/2 turn = 33 ohms) to achieve 6 ltrs / 100kms. It's been this way for the past 20,000kms, which results in 500kms to one Adventure tank full.

Hope this helps, my apologies for the late post.

Hamish

 

[gsmunch]

hi guys i got 2001 gs1150 its done 80k just brought it went 4 a ride from birmingham to weston got to 120 miles and the light came on i thought to my self my ninga 900 used to do that sort of miles to tank on a run. my gs just been serviced so i think i best get mine looked at

 

[~Stef~]

I had a similar problem with excessive fuel consumption with my '95 1100 and found the CO pot' to be the culprit.


Hope this helps, my apologies for the late post.

Hamish

Cheers Hammish ive passed that info along

 

[(RIP) Kaister]

I had a similar problem with excessive fuel consumption with my '95 1100 and found the CO pot' to be the culprit.

With the pot' off, and borrowing a multimeter, I established one full turn to equate to 66 ohms. (Measuring resistance between 2 & 3). Useful for later fine adjustments without a multimeter. (I'm travelling in South America at present and don't carry a multimeter.

With helpful advice from Roddy, I ended up starting at a setting of 840 ohms, achieving an average figure of 7.6 ltrs / 100km. I later increased the resistance to 873 ohms by turning the pot' screw by half a turn in a clockwise direction (1/2 turn = 33 ohms) to achieve 6 ltrs / 100kms. It's been this way for the past 20,000kms, which results in 500kms to one Adventure tank full.

Hope this helps, my apologies for the late post.

Hamish

thats gold right there

good info and sadly missing from this site until now

take a bow

 

[~Stef~]

thats gold right there

good info and sadly missing from this site until now

take a bow

My mates just called to say his CO pot was at 533 ! So its now been tweaked to 873, hopefully its now sorted

Noticed its 16oC in Sydney, thought it was supposed to be warm there
Its 20oC here in Glasgow today

 

[~Stef~]

Just checked my own 663

 

[roddy]

remember once you change the CO pot to check the colour of the plugs so you don't go lean