86 aspy bad milage

imported post

You might try some Sea Foam to get the carbs a little cleaned out, and a new air filter for starters. Then just basic tune-up, and be sure you don't have any dragging brake-pads. You may also want to bump-up the tire pressure.



Low to mid 30's is pretty normal for sustained speeds above 70/75mph... :gunhead:

imported post

run a few tanks with seafoam. Check your air filter. Check your plugs for color and check your exhaust for soot. Plugs should be nice light gray. sooty exhaust would indicate running too rich.

imported post

You didn't say what your brother was riding...and good advice above... , but just a tank or twoas a check is not very accurateand actually 28 mpg at 85 mph is not that bad.. and 37 mpg at 65 mph is in the ball park... dressed wings have terrible aerodynamics so mileage drops off very significantly at higher speeds (inversely to speed squared)

imported post

28 MPG over 80? Sounds normal to me. I think your brother has found the magic mileage pill.

John

imported post

thanks for the info I'll try those suggestions and see if I can't get just a little better.