RPS HAWK 250 Fuel mileage

[Johnetattoo]

I'm weigh 280lbs and get 36mpg out of the Hawk. It's running great, not rich and I'm running a Mikuni VM26 clone and no CAT.

I'm going off the specs where I read that you have 3.23 gallons before reserve. I rode 116.2 miles before having to turn the reserve on. 35.97mpg

I was expecting more and have heard other heavy weights getting 50mpg. What you guys getting????

[Megadan]

I weigh 256 currently at 6'4'' tall and I average 58.6mpg overall mixed city and highway with a cam upgrade, ported head, PE28 carb, and every other modification you can name. I run the equivalent of a 17 front and 45 rear sprocket.

On my first Hawk, which was geared the same way with just an exhaust and pod filter with the same VM26 carburetor I would usually average in the mid 60's but could get over 70 if I maintained a steady 55mph.

Even with stock gearing the worst I have ever heard anybody get was in the low 50's or high 40's

[krat]

I have a TBR7, same engine but 17" rear wheel. 17/40 sprockets. I weigh 230. I get 75mpg consistently.

[Badluck]

I get high 50 to low 60 mpg.

[Magician16]

Both my bikes get over 60 for 50/50 riding.

[Johnetattoo]

Sounds like I need to figure out whats up and more accurately measure my fuel.....I have to be wrong.

I'm noticing that sometimes the tank capacity is listed as 14L but mostly 12.5L

I was going off the 14L, 3.23 gallon until reserve specs that I found online.

I filled it up using a 5 gallon gas can and not the darn pump. I have no clue what I actually put in.

So, anyone know what the actual capacity and reserve capacity is?

[krat]

You are overcomplicating things. Forget what the spec sheet says, it does not matter.

Top off your tank, write down your odometer reading, go for a good long ride. After the ride stop at a station and refill the tank. Divide the kilometers on the odometer (yes it is in kilos) by the amount of fluid you replaced and you have your answer.

If you have a problem with the kilo to miles conversion google will help you.

Actual range one never learns until they are sitting on the side of the road in 100 degree heat wondering which direction the nearest station is. When you hit the reserve dig some change out and buy some gas. That is why they are designed that way.

[Megadan]

Originally Posted by krat

Top off your tank, write down your odometer reading, go for a good long ride. After the ride stop at a station and refill the tank. Divide the kilometers on the odometer (yes it is in kilos) by the amount of fluid you replaced and you have your answer.

If you have a problem with the kilo to miles conversion google will help you.

The stock speedometers are rarely ever reading in Kilometers either. Most read somewhere between a mile and a kilometer. I always tell people to figure out what theirs is by planning a route of a known distance that is almost exactly a couple of miles and see what the odometer actually reads at.

Either that, or get a good aftermarket speedometer and calibrate it to read properly.

Once you know your conversion rate, if any, then yeah, fill it up, do the math. It might not be super exact, but it's not hard to fill it to the same point each time, and that won't throw your fuel off by enough to greatly effect your math.

[JerryHawk250]

Best to check actual mileage with a GPS. My Hawk averages about 65 mpg on the street and will drop to about 55 mpg when doing mostly off road.

[dig4dirt]

A kilometer to mile true conversion is 0.62

On my initial calculation on "my bike" is 0.57 units on odo to get to true miles.

Tires and tire wear will effect it. And this is just the beginning.
Since the tanks are very small, it will vary in multiple ways.
As others have posted, you will need to measure a true distance to figure out a range.

[Johnetattoo]

I am actually over complicating things. I am using an aftermarket odometer and speedometer that has been calibrated to match my GPS and seems very accurate. I don't take the bike into town to fill up and just bring fuel cans to the station. I guess I'll actually ride the bike into town or measure my fuel more accurately and try again.

Thanks guys,

[Hunnicutt]

I get 63 MPG consistently on my TT250 with a 112 main jet. I'm 6'1" and 230 lbs in full ATGATT.

[J4Fun]

Hi all, it seems like at 280lbs that you may have more wind resistance? Hence why John may be getting worse mileage. Just a thought here??

[Megadan]

Originally Posted by J4Fun

Hi all, it seems like at 280lbs that you may have more wind resistance? Hence why John may be getting worse mileage. Just a thought here??

You would think that, but my 6'4" tall butt at one point weighed over 300lbs, and I never got anywhere near that bad of fuel economy with my Hawk. Even going 60+mph

[J4Fun]

Maybe tire pressure is to low also?