Needed Reserve at 4.8 gallons.. - Kawasaki KLR 650 Forum
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post #1 of 21 Old 09-24-2007, 04:25 PM Thread Starter
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Needed Reserve at 4.8 gallons..

And I'm not sure why..
I was riding home, at Interestate speeds of 70-75mph, into the wind, and I ended up having to switch to reserve at 189 miles on the tank.. I rode to the next exit and filled it back up and only put in 4.8 gallons..

Seemed kinda odd that it needed to be switched to reserve at 4.8 gallons..

I understand the crappy gas mileage, as I was hammering down the road, loaded with lotso stuff on the front and back of the bike, into a pretty stiff headwind. I just don't understand the reserve need before 5 - 5.5 gallons..
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post #2 of 21 Old 09-24-2007, 05:05 PM
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That is exactly the amount mine needed to fill it up when I hit reserve doing the same style riding. Coming home on I-75 from TN, doing 75 most of the way. My odometer showed 212. We were about a mile from an exit where we got some fuel. It was a bit unnerving doing 75 with semi's around me and then all the sudden have the bike do a nose dive with the engine coughing.

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Previous ride was a 2007 KLR Black/Silver, I miss it..
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post #3 of 21 Old 09-24-2007, 05:09 PM Thread Starter
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That is exactly the amount ...
Thanks.. I feel much better!! Still a bit confused, but much better..

Why have a 6.2 gallon tank when it's hitting reserve at 4.8??
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post #4 of 21 Old 09-24-2007, 06:57 PM
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39.4 mpg, did you do some trail riding in between? Or something flaky is in your fillups.
I had a GPz 550 get low 30's once, but it was after a day of 6-7500 rpm. Normally got 55mpg.
Jim

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post #5 of 21 Old 09-24-2007, 09:54 PM
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I equated it to having to pull several hundred pounds of weight up hill most of the way home.


Quote:
Originally Posted by on2wheels52 View Post
39.4 mpg, did you do some trail riding in between? Or something flaky is in your fillups.
I had a GPz 550 get low 30's once, but it was after a day of 6-7500 rpm. Normally got 55mpg.
Jim

2008 DL650 VStrom Yellow and Black
Previous ride was a 2007 KLR Black/Silver, I miss it..
Looking to get back into KLR's sometime soon.

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post #6 of 21 Old 09-24-2007, 09:58 PM Thread Starter
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Originally Posted by on2wheels52 View Post
39.4 mpg, did you do some trail riding in between? Or something flaky is in your fillups.
I had a GPz 550 get low 30's once, but it was after a day of 6-7500 rpm. Normally got 55mpg.
Jim
Nope.. That was all highway miles on that tank, and I filled up as I normally do, which as always been consistant..
As I mentioned, I was loaded down (see photos of earlier in the weekend) and I was riding at 70+ (GPS readings, not speedo) into a 15-20mph headwind.. With all the crap on the bike, and the bike pulling my lard butt into a 95mph headwind (speed plus wind) the 40mpg doesn't surprise me all that much..



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post #7 of 21 Old 09-24-2007, 10:05 PM
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I gotta get me some tank panniers like those. I like em, look good on your bike.

2008 DL650 VStrom Yellow and Black
Previous ride was a 2007 KLR Black/Silver, I miss it..
Looking to get back into KLR's sometime soon.

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post #8 of 21 Old 09-24-2007, 10:06 PM Thread Starter
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I gotta get me some tank panniers like those. I like em, look good on your bike.
They work great, too.. I never take em' off..
KLR650.com is where I got them..
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post #9 of 21 Old 09-25-2007, 12:22 AM
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Quote:
Originally Posted by Paper View Post
And I'm not sure why..
I was riding home, at Interestate speeds of 70-75mph, into the wind, and I ended up having to switch to reserve at 189 miles on the tank.. I rode to the next exit and filled it back up and only put in 4.8 gallons..

Seemed kinda odd that it needed to be switched to reserve at 4.8 gallons..
The simple explaination is that the remainder of your fuel was stuck in the back half
of your tank due to a centripital-induced, temprature retarded, force.

The accelleration and subquent high sustained speeds caused the fuel in your tank to be
semi-permanantly retained in the aft or rearmost portion of your fuel tank. Normally the
fuel would have sloshed ("Sloshed is a technical term for splashed) back to the center
of the tank but the high speeds you experienced created a vaccum, or low pressure area,
on the bottom center of the tank.

This low pressure area is a result of the Venturi effect, the low pressure area cooled the
tank to a tempreature below or nearly below the "Gel" temp of the fuel.

When you re-fueled the tank the cold fuel warmed up and settled back to the middle
of the tank and your quantity was seemingly off.

Simple no?
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post #10 of 21 Old 09-25-2007, 07:07 AM Thread Starter
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Why didn't I think of that??

It was so simple, too..

Next time I'm going to ride at 14.7 mph to keep my fuel temperature in check.. I guess I'm now wondering if I push my motorcycle backwards, will it refill my fuel tank??
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