How many miles when you switch to reserve?

My bike's a '97 KZ 1000P and I have to switch to reserve at about 95 -100 mile on a fill up. But then I top off the tank and it only takes a bout 2.5 gallons. With the tank holding around 4 gallons do I still have a gallon and a half when I switch to reserve? It seems a bit much to me.

Sounds excessively early.

I would take the gas tank off and clean out the area around the petcock to ensure it's not getting plugged with rust/sediment causing premature reserve.

As for how many miles, that depends greatly on your gas mileage (of course).

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Some trim down the fuel pipe on the petcock inlet, remove from tank and look how tall it is. Me I ride on RES all the time, keeping track of miles traveled and where the gauge is registering. You should be in the 40-45 MPG range with stock bike and gearing, so 4 gallons should go 160 miles on the open road. I've gone 183 on my 1000 LTD with a 1 tooth larger counter-shaft sprocket, 16 as apposed to 15, 630 chain. But that gauge was bottomed for quite awhile, :whistle:

It starts to sputter around 80-90 miles and then reserve gets me to about 110 or so empty (found that out the hard way once).

I may have to try it again while taking extra gas with me.

Yesterday, I looked down and my trip odometer was reading 105 miles. I always reset it to zero when I fill up. Well I thought maybe I'd left it on reserve but I hadn't. Usually I have to turn the valve way before 105 miles. A few days before the last fill up I changed my air cleaner and just doing that gave me 105 miles on only 2.46 gallons. I guess that made a big difference.