uh oh... another 6th gear thread - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 07-11-2011, 08:28 PM Thread Starter
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uh oh... another 6th gear thread

before you all crucify and burn me at the stake, I fully realize 6th gear isnt possible. what I was curious about was if we could have a 6th gear how much better would the gas mileage be? I was just thinking about this today and I'm sure some of the more technically minded members here could probably come up with a rough estimate
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post #2 of 7 (permalink) Old 07-11-2011, 11:54 PM
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It would depend on the gearing chosen and how it's driven, but I would expect I could routinely get highway MPG starting with a 6 at 60 and high 50s up to 70 with a well-chosen highway gear.
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post #3 of 7 (permalink) Old 07-12-2011, 01:50 AM Thread Starter
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It would depend on the gearing chosen and how it's driven, but I would expect I could routinely get highway MPG starting with a 6 at 60 and high 50s up to 70 with a well-chosen highway gear.

Boy wouldn't that be nice! Thanks for the response! I find it weird that the owners manual says you should be in 5th by 31 mph. Seems like with they coulda made the gearing a little more wide at the very least.
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post #4 of 7 (permalink) Old 07-12-2011, 05:57 AM
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You could just slow down.

And who follows the manual for shifting ?

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post #5 of 7 (permalink) Old 07-12-2011, 09:26 AM Thread Starter
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You could just slow down.

And who follows the manual for shifting ?

Nobody does. I just said I found it odd that they reccomend that? The engine has decent power, why not widen the ratio a bit?
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post #6 of 7 (permalink) Old 07-12-2011, 10:30 AM
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Nobody does. I just said I found it odd that they reccomend that? The engine has decent power, why not widen the ratio a bit?
You could say that for ALOT of bikes. Gears need to transition smoothly....both up and down. Make them too steep and someone will skid out the rear downshifting and sue the maker. Conversely you lack power gearing a bike for higher (if only theoretical) top speeds.

If you want great gas mileage, get a scooter. Bikes, even "cruisers" are still considered "sport vehicles" and owners want them to go fast , and to do so smoothly.

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post #7 of 7 (permalink) Old 07-12-2011, 11:17 AM
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Sorry , forgot to answer your other question.

The 31 mph in the manual is the minimum speed you should be going before shifting to 5th.... without lugging the motor so bad it stalls. Of course most shift at a bit higher speed

I had no problem at all cruising all day at 5500 rpms, this ain't a big bore vibrate your nuts off Harley.... It's a small OHC twin with rubber mounts.

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