I'll do that tomorrow. I just put new chain an sprockets on. Rear end was freely spinning up on lift. Changed fork boots and front wheel spins free as well. I check plug. Just changed to a new Twin Air Foam air filter. Cant figure it outPull the spark plug and see if it's black, check to make sure your breaks aren't dragging.
Thats alot of weight. I never ride 2 up. Just my backpack for carrying stuff. Im going to fill up and recheck today or tomorrow. Going to look at plug too. ThanksOther factors to consider is how the bike is used. I have roughly 500 miles on my 2020, and the last adventure I went on, I got 57 miles before I went on reserve. But I was on gravel roads, many starts and stops, two up, and probably 100lbs of gear. All being said, we used 2-1/2 gallons of 87 octane non ethanol that day, went 103 miles, 50 of which was not pavement, and given the load on the bike, I feel that my mileage was fair.
Actually Twin Air is less restrictive. It makes it more responsive than the K&N that the previous owner installed. Im going to do a retest this weekend without a bunch of start and stopsI've seen everything from 55 mpg to 105 mpg over the years. 55 at 65 mph into a headwind, 105 just putting around in the mountains at 40 or less mph. Stock rear, Shinko 241 front, 12/14 psi in dirt, 18/18 psi on pavement. I generally average about 75 mpg, so your mileage definitely sounds low unless you are wringing it out all the time. I don't know anything about the Twin Air filter, but it could be more restrictive than the stock.
I ride at some points of my ride at 50 to 55 mph. Normally around town at 40. Stock tires. 14t in front 49 tooth in rear.Reported overall condition of El Viejo's bike sounds very good.
Only un-reported status is what gears and RPMs were typical for the observed 55miles/2.3 gallons which sounds like a record low 24mpg.
24 mpg is about 1 third of what the optimists report for stock geared bikes at high tire pressures running primarily in top gear at modrate speeds and at moderate elevations. Odd, geared down, atv tire, slow trail speeds and only briefly in top gears the worst mileage I have observed is a fairly consistent 50 mpg.