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Post by tuttlemon on Jul 3, 2020 17:07:36 GMT -5
I’ve recently upgraded to an 80cc BBK. Now the bike reaches 40mph real fast(front tire almost lifts), and and the rpms sound maxed. What final gearing should I upgrade to? I’d like to still retain a decent takeoff speed.
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Petro
Scoot Enthusiast
Posts: 149
Location: Gothenburg, Sweden.
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Post by Petro on Jul 4, 2020 16:56:39 GMT -5
On my scooters I always go balloon tyres (see my signature) and my current bike I had to do some surgery on the lower exhaust bolt though so have that in mind if You go that path... otherwise around 10-15% up is enough for daily use in my opinion.
Depending on Your belt length you can alter there too by putting a tidy longer one on if there is room for it.
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Post by FrankenMech on Jul 4, 2020 18:24:45 GMT -5
Everything is a compromise. If you get higher top speed you lose takeoff, -just physics. You can tweak and tune but there is no free lunch. Higher displacement == more power, try a 150cc scoot. Give up gas mileage. Your 80cc upgrade will come apart sooner, you lose reliability.
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Post by tuttlemon on Jul 6, 2020 10:34:55 GMT -5
Everything is a compromise. If you get higher top speed you lose takeoff, -just physics. You can tweak and tune but there is no free lunch. Higher displacement == more power, try a 150cc scoot. Give up gas mileage. Your 80cc upgrade will come apart sooner, you lose reliability. Ya, not expecting free lunch, the engine is screaming now, and I figured I could sacrifice some takeoff for top speed, as I feel I have so much take off, the front wheel nearly lifts. |
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Post by GrumpyUnk on Jul 7, 2020 12:41:06 GMT -5
On site there are words and a table about tire sizes and their respective diameters. You can change the tire to a larger tire and lose a bit of acceleration, while at the same time allowing less rpms per mile traveled.
The alternative that is available is to change a pair of gears in the final drive gearbox. Again, on site is a video demonstrating the 'count of clutch rotations per rear wheel rotation'. A calculated final drive ratio from that count, and there may be some commentary on the gear sets available and the resultant final drive.
I do not have it memorized, and have figured, for me, the speed on one of these little beasts is high enough that I don't want to go faster than 40. You do have to have a strong engine to change the final drive to a longer gear ratio or you'll feel jealous as snails pass you by. ( a joke.)
tom
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Post by FrankenMech on Jul 7, 2020 19:01:42 GMT -5
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Post by Mech Warrior on Jul 14, 2020 21:09:31 GMT -5
Tuttlemon want's "reduced lunch".
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