650r with edelbrock gets terrible mileage-why?

My '01 650r is uncorked & plated with a drilled out stock exhaust and a QS carb. I can only get about 50 miles of trailriding out of my stock gas tank before going to reserve. I think that sucks! It seems to be jetted correctly, do I just need to turn the pump screw in more? How far is safe?

I don't think that has anything to do with the edelbrock carb but more to do with 650 thirsty CC's I had the stocker jetted perfectlly and now I have the edelbrock and both only get me about 50 miles worth of trail riding before it is reserve time on the stock tank. If I am riding it on the road I can get about 75/80 before reserve but that is just cruising around.

How is your fuel consumption in terms of miles per gallon?

I do not use the stock tank, and don't know the capacity off hand.

Thanks

Less than 30mpg

I dont get any better than 30 :)

I was running dangerously lean once and got 47mpg.

I don't suggest it, but it happened.

well it's nice to hear that I'm not alone, guess I'll just have to live with it. That's ok, there's nothing like a big 'ol handfull of 650r power!

My '01 650r is uncorked & plated with a drilled out stock exhaust and a QS carb. I can only get about 50 miles of trailriding out of my stock gas tank before going to reserve. I think that sucks! It seems to be jetted correctly, do I just need to turn the pump screw in more? How far is safe?

The 650R is pretty thirsty, but the tank design doesn't help.

The bottom of the tank on the side the fuel tap is on is considerably higher than it is on the other side. So there's always a couple of litres of fuel that you have to carry around, but can never use. :)

You can fit a second fuel tap on the LHS and join it in to the existing fuel line. You'd then leave the original tap on reserve all the time, and then open the second tap if you got to the bottom of that.

Or ya can buy a bigger tank.

:)

My '01 650r is uncorked & plated with a drilled out stock exhaust and a QS carb. I can only get about 50 miles of trailriding out of my stock gas tank before going to reserve. I think that sucks! It seems to be jetted correctly, do I just need to turn the pump screw in more? How far is safe?

If you are hard (really riding) on the bike; on and off the throttle you will get low milage. That is because you wanted that off idle snap :) Everytime you go off and back on the throttle hard the pump will do it's job and pump a bucket load of fuel and the bike comes to life. If you have the pump screw in to far you will be using more fuel then you need to and waisting it. 2.5 to three out is normal on the pump screw. Also adjust the needle to "lean" till the bike pops when you let off from higher RPM's them go back rich till it just stops. This will give you the most power and the best mileage. #18 needle? A uncorked stock bike gets 65 miles a tank fuel with hard riding, the Edelbrock would get better if you stayed out of the pump but, then you wouldn't have that silly grin on your face :D Get a Clarke 4.3 and forget about how much fuel you use :)

http://xr650r.borynack.com/

Just gear it taller and short shift more, mines consistant at 40mpg off road and 47 hiway at 75 mph and it's running on the rich side, and runs cool. If you rev the thumpers they will suck fuel, When I had a XR650L and geared it down for better performance the mileage dropped about 10 mpg.

A uncorked stock bike gets 65 miles a tank fuel with hard riding, the Edelbrock would get better if you stayed out of the pump but, then you wouldn't have that silly grin on your face :)

Yeah - it's just opening and closing the throttle that does it.

Best to leave it wide open for best fuel economy. :)

My mpg seems about the same from the stock carb to the E carb, The BRP is just a big bore whore and luvs the gas........... :)

Or ya can buy a bigger tank.

the bigger tanks are designed the same way. The 4.6 gallon tank I just put on the BRP holds close to a gallon (pretty sure anyway :) ) on the left hand side that you have to tip the bike to transfer over to the right hand side fuel pickup.

But, with that big of a tank, I don't plan on ever having to hit reserve before the next fuel stop.

the bigger tanks are designed the same way. The 4.6 gallon tank I just put on the BRP holds close to a gallon (pretty sure anyway :) ) on the left hand side that you have to tip the bike to transfer over to the right hand side fuel pickup.

But, with that big of a tank, I don't plan on ever having to hit reserve before the next fuel stop.

Yep - my 16L IMS tank on my XR is the same as well - but as you say, it gets at least 100 miles of hard riding before needing reserve, so it's not too much of a worry. :)

You might want to try to adjust the pumper. Most likely it is richer than it needs to be--i.e it is squirting too much gas when you hit the throttle...

.

With the bike warmed up and idleing, just back the screw up a quarter turn and then whack the throttle. Keep backing it until there is a slight hiccup. Thats where you are to lean (or to rich!)...go back a bit to where it is crisp and clean. Now you should have better milage and still excellent off-idle response.

Becouse the BRP is a low reving bike-you should be getting better milage than most - if not all - other new 4 strokes...at least 30mpg with the edelbrock unless you are really racing it hard or riding it in to low a gear...I get over 30 mpg even when going at it hard.

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