Yamaha XS1100 Fuel Economy Milage

[XSIIE]

Hey Chrisso,

On the new subject.

My 78E

XS1100 to 1196 with a Wiseco kit.

Substantial head work. (Cams, ported and polished)

Crank balanced etc.

Standard carbs with stage 2 carby kit (for a big bore, modified head and standard exhaust) (stages 1 - 4 available in kits)

Standard exhaust.

All this makes for smooth power throughout the range. (Bourke Rolling starts)

The power didn't just whack you it just kept pulling till I backed off.

I will bring it round when I come to visit.  (not this weekend as I have baby sitting duties)

There are pleanty of mods and twice as many "opinions" on what makes these things go fast (er). in the lower, middle and top ranges.


It all depends what and where you want faster to be.

Eddy

[Jonesy :-)]

hey chrisso your flame job tank definitely holds 24 ltrs, and 4 of those are reserve

[chrisso]

OK. Does the tank hold 20 litres of motion lotion  or 24?. An empty XS1100 ( except the custom) . will take 24 l  ?
On another subject, when my XS gets a bit long in the tooth...haha.    And we need do look at some  engine work.
Before this bike --actually at the same time, I had a GPZ 900R.  Before both of these I had a 1977 Z1000. Now the Zed died. Eventually I tracked down a Z1 motor in good condition and imported  it to NZ. Also fitted with a Wiseco 1075 kit. Transformed the old Kwak from 1015 cc  to 1075 cc. Did still have the original 26mm Carbs but.
Question is;  what are the options with big bore kits for the XS??. 1102 cc   to what?? .  Keep the standard  34 x 4 Mikuni
s ( which are hard to come by)  . Standard cams??? An XS1100 is not a top end screamer---or is it?.
Smoothbore Carbs?? Hmmmm

[excess.11]

Haines manuals = Yank (ya doodle dandy) manual ......which states what the lower spec USA bikes tanks size was.

[chrisso]

Hi Chrisso, about 40mpg converts to about 5.9L/100km Sounds like you better find a way to start sucking some more juice into that donk. 
Did you ever run the XC down the 1/4 mile 

No 1/4 times for the XC . It was always a work in progress..  It only had ever had the 6 cyl diff. which from memory was around a 2.95 ratio. looong legs. And a single rail gearbox( which never blew up like the diff.) After blowing the 1st diff I stop doing burnouts. Im guessing with a 9'' and say 3.25 ratio would have run high 12's? It would sit on 220 all day. ( Back in the mid 1990's before all the camera's etc.
As for XS tanks, I always thought they have a 24 l tank but im only going off the original Haines manual which states: E F and G models= 20l/ 5.28 Imp US galls.          SF and SG= 15 l.

[pgnz]

Huh?  Since when was the B.S. yank gallon system anything other than an indulgent crock of crap used only by the pretentious yanks??   

[BrettS]

14km/L = 33 mpg =7.1 L/100km   

[Jonesy :-)]

I can vouch for chrisso's mpg, it used to get 14km/litre or roughly 42mpg when I had it. but used to work that out at 4.8litres = a gallon and apparently that's wrong.  but the 14kms/litre still stands

[pgnz]

If the speedo's a bit out of true whack  (common)  then mpg from milage read isn't going to be dead-on,   even though trip-meters are pretty accurate.   But those mpg numbers all sound kosher, about 14-15 kms per litre/40 proper mpg, but heaps more if you screw the throttle. 

 Unlike the commonly-seen  BS claims on the yank site of 45 and 50 miles to a us gallon..  At a constant 80mph..  two-up loaded with fairings and hardbags too... yeah right...the yanks couldn't tell the truth if they even tried.

 Best my bike did with tailwind and slightly taller gearing at 100kph cruise throttle barely open was 18kms per litre ,  but pretty rare.  Around the 14 kms per litre normal at 100kph.  91 octane all good even with wiseco 1196cc,  mines also 5 deg advanced timing,  theory might say 95 would be better for an 1196 wiseco's extra compression but nah there's zilch difference between 91 and 95 on these bikes

[excess.11]

I think the quoted mpg/kpl are out due............. to chrisso s belief that his tank holds only 20 ltrs when in fact it holds 24ltrs .

[BrettS]

Hi Chrisso, about 40mpg converts to about 5.9L/100km Sounds like you better find a way to start sucking some more juice into that donk. 
Did you ever run the XC down the 1/4 mile 

[chrisso]

Seems to me , a standard 1980 XS1100G tank holds 20 litres. Of which is 4  or 4.5 litres on reserve. As mine doesnt have a fuel guage the last time I checked fuel consumption( which was a while ago ) was between Sydney and Newcastle: I got a figure of around 40 mpg. Sorry Im old school. My last car was an XC Ford Ute---Ex show car, rebuilt high comp 351 Clevo,  4 speed,  --- that beast did 9.5 mpg around town. Mind you it did have well over 450hp on the good shit. Which I worked out somwhere is like 30/l   per 100 km. Seems to me fuel economy is irrelelivant. . An XS1100 has a large tank. . Who cares; give me horsepower , style and substance over .....

[XSIIE]

Thanks Pete,
The RH is stock, the 78E has had all the work done.

I'll start using 91 in the RH.

Eddy

[Jonesy :-)]

Just ran 2 E models to Philip island and back refuelling at the same stops. both are bog standard except for 4-1 pipes on one of them
they both pretty much used the same amount of fuel to within a couple of points of a litre and sometimes exactly the same. it was usually the 4-1 fitted bike that was using less, but the 4-2 bike was slightly heavier loaded. we used any thing from 91 to 95  and once or twice 100 octane. but steered clear of ethanol blend
one consumption figure I noted was 12ltrs for 210kms at about 110-115 kph. roughly 17km's a litre. and ive had that sort of return several times before.

[petejw1966]

Interesting stuff about the octane levels in the fuel.

I use 98 in both bikes.

The E  has had considerable head work (ported and polished, bigger valves etc) and has an 1196 big bore kit with a standard pipe.  never misses a beat.

The RH is standard and well worn, used daily, again never misses a beat , however I do need to regularly change the plugs as they "foul" up.  Not sure weather it's from the fuel or something else. This one runs a pipeline 4-1 power pipe.

I'm gomnna switch to 91 and see if that does anything?

Eddy

hi eddy,
fwiw, you only need to use 98 in high compression motors,
if the standard is standard then run 91 and that will help
stop fouling up your plugs.