Gas mileage ???? 19 mpg? Kat 1100 89

[Swamplizard]

Took a ride this weekend accross aligator alley - 114 miles straight and flat. Ran between 85 and 95 on a topped up tank and ran out of gas before I got to the first gas station -

I calculated less than 20 mpg - something wrong with this gus sucker?

any idea what could be going wrong (and no the choke was not left on)?

[Scout]

Stuck floater guage? What kind of exhaust do you have? They can lower (not that much though) your MPG...

[ansobu]

wowza! I've been getting around 40 mpg on my 88, that's occasionally hitting 100+ mph.

I'm sure some fine people will be on here momentarily to help you out, as I don't know too much about carbs!

[Kfreak]

Don't know anything about your bike. Mod's? Jet kit? K&N pods? Aftermarket exhaust?

[Swamplizard]

sorry about the lack of details:

Yosh 4:1
Stage 1 jet kit
stock chain, sprockets, tires, and filter

It is a 1989 with 30k miles - motor has never been opened up.

Thanks for hints/ideas

[BIGKAT1100]

sorry about the lack of details:

Yosh 4:1
Stage 1 jet kit
stock chain, sprockets, tires, and filter

It is a 1989 with 30k miles - motor has never been opened up.

Thanks for hints/ideas

I am running a similar set-up except for the chain sprockets but add a 5* advancer. That wouldn't make any difference if you didn't change the gearing. I get mid-upper 30s to low 40s mpg and I may need plugs. I would start at the vacuum hoses. Then move on to the coils, wires and plugs.

How was her performance during your trip ?

How old was the gas you had in her ?

... just my .02, keep us posted as to what you find out.

[scottynoface]

Yeah that's bad even for an 1100. Heavy on the throttle or just freeway cruising? My 636 only gets about 30 if I'm blasting around town.

[Swamplizard]

new gas
ran fine though it has been wierd at idle lately ...popping sound like it is missing on one cyl

I'll check hoses and plugs

[Kfreak]

Yes, change your plugs. It's a start.

[BIGKAT1100]

[Suzukii600]

how big of a difference could a vacuum hose make? i have a 600 but the one on the bottom of my air box is off and i was 2 lazy to pull everything back out and connect it... and i have only been getting about 30mpg if i take it easy

[Kfreak]

That hose being off will cause a lean burn. Don't know how much though.

[Suzukii600]

That hose being off will cause a lean burn. Don't know how much though.

well i think it was a little on the rich side to begin with, so it probably helped it.... idiots screwed up my jet kit, then wanted to charge me to fix it....

[Steveb]

I've had a bout of atrocious mileage on Suzi once...pulled apart the carbs and found this!:


It ran much better, and with much improved fuel efficiency, once all the main jets were secured.

This "set up" netted under 10 mpg.

[ansobu]

Yikes! How many of the main jets were loose? I'm surprised the bike even ran, your gas probably was getting blown out the exhaust!