Join Date: Mar 2011
Location: Fairfield, Virginia, USA
Model: '97 GL1500SE/ '98 Lehman GTL Trike
A faulty air cutoff valve usually will lead to back fires on deceleration, like an exhaust leak might.
You don't say, but how long have you noticed this "bog" like behavior? Was it ever "not like so" for you?
Early 1200s often were set up lean in midrange resulting in a bog or hesitation. There is a way to cure that usually without hurting mileage. My '85 I owned from 1995 until a couple months ago consistently got 45-50 mpg one up on most highways one up, even two up. If it had ever dropped to 35mpg, I'd have been worried. I have had it running distance on Interstate at 75 for hours, but usually my riding was 50-55-60 mph on US highways or State Roads … or the BRP.
GL-1200s have 4 carbs, a 7,500 rpm redline, and they thrive at 2,800-3,000 rpm and above. Pulling hard in higher gears at lower rpms is not their bag.
1997 GL-1500 SE / 1998 Lehman GTL Trike
...(Candy Spectra Red )
GWRRA, NRA, & VSPA Life Member
"Make Courtesy Your Code of the Road!"
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