Village Whack Job...
Join Date: Feb 2006
Location: Milwaukee, Wisconsin, USA
Model: '81 GL1100 Interstate
With what you describe; high gas mileage, and low power I would suspect a vacuum leak somewhere. which is creating a substantially lean mixture. I bet if you pay attention you'll notice your fan kicking in a lot.
I would check things like; the clamps on the intake boots make sure they are tight, check the vacuum line for the timing advance make sure one end or the other hasn't come off or that the line has dried out and split. There is a screw in the base of each intake runner make sure they are all there and tight. Make sure the crank case breather tube is secure on both ends. If you don't find anything there then it's time to maybe pull the intakes runners and inspect/replace the o-rings in the bases. Inspect the plenum seals maybe.
But I'm pretty sure yer getting extra air in the system somewhere.
P.G.R. Member ID: 88374
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