Gas consumption

Coval_PL · #1 08-02-2009, 06:11 PM

Hi everybody. I have 80cc Skyhawk motor installed in my MTB. I wish to now gas consumtion of this engine. Has anybody idea how can I mesure gas amount in a standard gas tank? I ask aobout it becouse I feel there is something wrong with my engine. It's quite new, I ride about 26km and it took around half of a tank. Am I too heavy or something...

motorbiker · #2 08-02-2009, 06:20 PM

I am about 160 and I don't think I ever got over 100 mpg.

Then again I think a 2 stroke doesn't sound right with the throttle less than wide open.

Cabinfever1977 · #3 08-02-2009, 11:22 PM

I am around 120lbs and im getting around 180mpg or more.

Finfan · #4 08-03-2009, 12:01 AM

I put a speedometer/odometer on my 48 cc and I figure I get about 120 - 130 mpg (roughly). I weigh in at 180 lb.

Maxvision · #5 08-03-2009, 12:18 AM

There are many variables to gas consumption. Do you run throttle wide open all the time, are the roads you ride flat or hilly, are your tires properly inflated, are your tires wide or thin, gear ratio, fuel mixture, cheap gas, old gas, carb needle setting, exhaust bore narrowing with deposits, type of exhaust, dirty air filter, altitude, wind direction, worn rings, chain too tight, wheel bearings too tight. Probably more if I think hard enough.

Cabinfever1977 · #6 08-03-2009, 12:25 AM

i run full throttle on flat roads and dont know how air in tire,i hope theres enough and i have wide cruiser tires with a 44t sprocket on a 26" bike with a clean airfilter and i mix my oil/gas in da tank around 20-25:1 with cheap gas+cheap oil and the carb needle is at the very top and i live near mountains and is windy half the time. i weigh 120lbs.

180+mpg

TheE · #7 08-03-2009, 12:34 AM

I'm about 170 lbs, and ride with a standard sprocket, usually cruising at 50-80% throttle. I get pretty crappy gas mileage, around 80km/gal =/

Still better than a car...

Coval_PL · #8 08-03-2009, 04:03 AM

Quote:

Originally Posted by Maxvision

There are many variables to gas consumption. Do you run throttle wide open all the time, are the roads you ride flat or hilly, are your tires properly inflated, are your tires wide or thin, gear ratio, fuel mixture, cheap gas, old gas, carb needle setting, exhaust bore narrowing with deposits, type of exhaust, dirty air filter, altitude, wind direction, worn rings, chain too tight, wheel bearings too tight. Probably more if I think hard enough.

My weight is around 220lbs (100kg). I have MTB with 1.95" off-road tires. I'll try to inflate then more.
I have standard (big) sprocket, Shell gas with 1:16 Statoil 2T oil, long exhaust. I thing rest of listed below its ok. Maybe excluding carb. Regulation bolt is about 3,5 rounds (thats what manual say) on the idle works fine. I dont know how to set needle or throttle rope, there is no word about it.

Junster · #9 08-03-2009, 04:12 AM

Your milage will get better as the motor breaks in. I seem to get better milage riding hard than easy. I'm averaging 120mpg.

Coval_PL · #10 08-03-2009, 08:02 AM

I thing I have an answer. Half hour ago (in Poland is no 2:00pm

) I met one guy with motorbike and I've ask him about this problem. He told me, he had the same problem if the lever loaded valve at the gas tank is on the full-open position. I have also full open so I have to reduce gas flow I hope will be fine.
One more question. Which valve is beter to to that: at the tank or at the carb?