Hi peeps, I used to run, a 20 mil orig delly (with SX150 setup) GP cylinder, 57.00 piston, standard GP U bend, Standard GP exhaust. Just yesterday I installed a 22mil jettex setup for a GP150 (bought as a kit from SR with the manifold)
After Installing, I have notticed a richness in the running engine (grunts like a horny bitch) and a considerably drop in the fuel economy. A 5 liter of petrol was consumed in probably 10 or so miles of town riding (I have no speedo).
Ok, I know its a bigger carb and that I was running in town distances through the mean traffic lights of crazy Barcelona, but, is it that big of a jump as to consume fuel like that? I took a look at the plug and it was nice and brownie.
Any thoughts?
J.
Poor fuel economy
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Supereibar
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Fireman Ash
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The grunting reference made me laugh....I have a Dellorto 22mm fitted to my Stage 4 standard 200 fitted to my Ser.80 Jet and it drinks more than my alcoholic Aunty!!! had to fit a fast flow tap as when going up inclines it got a bit dry and thought it would like to stop!!! 
