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Owned Your Bike For 15 Years Plus?

  • Thread starter Thread starter Guest
  • Start date Start date
ajf said:
If the new tires are a different brand, they might have a different circumference even if they're the same sizes. Your odometer might be reading fewer miles for the same actual distance, giving you lower apparent mileage even though it is the same once you correct for odometer error. I just noticed this on my bike. Switching from Dunlops to Avons my mileage seemed to drop by about 5 mpg. I've just checked the odometer, and now it reads 4% high, vs 10% high previously. (This also affects speedometer error, so it's worth checking if you routinely try to ride just below the ticket threshold. I'm pulling the GPS from my airplane for my next ride to recalibrate the speedo.)

I've had the bike since new, and this was the first noticeable change in fuel mileage. However, there's no ethanol in gas here in Alberta, as far as I know. Wind has a big effect - can be as much as 20%. If you're basing this angst on a single trip that long ago, are you sure you can remember that you didn't luck out and have a tailwind on the way out, then a wind shift to a tailwind again for the return trip?
Click to expand...

The change in tires has crossed my mind. I try to stay close to the stock size. 100/90-19 front. Correct?

The day trip as I remember it was a hot one in August of 93. I had just left a job and was about to start another. Not knowing what the future or new job had in store for me and also being a newlywed I jumped on the 1100 and rode. As I said before the ride was around 5 or 6 hours on 2 lanes, about half was in small mountains. And maybe as in a previous post I mis-calculated the mpg or didn't fill it all the way. I guess I need to be thankful I have such a fine running machine.
 
If your engine is pinging, run some Berryman B-12 Chemtool or seafoam through it. This will remove any deposits in the combustion chamber. You'll need to do it a few times, once won't get the job done.
Ensure ignition timing is correct.
Install a fresh set of plugs and ride. Pull plugs and check the insulator color.
If the engine is still pinging, I'll bet the plugs will be white, indicating the carbs are lean.
Lean mixtures will cause detonation.
 
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