Honda Spree and Elite 50 Forums

Anyone changed their stock engine DIO gearing for more top speed? If so, what did you change to & did it work?

Thanks

Good to know that it's been done!
Feedback on results welcome...

Its been done a zillion times over, pretty common modification actually. Ive tried maybe 6-7 different ratios and I can tell you this: the ratio chosen should coincide with the available power.

My opinion:
Stock gears are best for stock motors.
9:1 for 72cc
8:1 or taller for 100cc etc...

Now, you CAN use stock gears on 72cc and 9:1 on stock motors. Ive done both and with a good trans tune (rollers, clutch springs, etc) they can be just great. Just takes some time to dial in.

Results are typical...taller gears reduce take-offs and give higher top speeds. Sluggish take-offs that result from a tall gear change can be remedied by lighter roller weights, tighter clutch springs and a larger rear pulley at the clutch. However, your DIO in England may be equipped with the larger pulley already..you didnt specify your DIO model.

I think you may have answered my question with "Stock gears are best for stock motors". I'm interested in people's experiences with alternate gearing for the stock 50cc AF18 motor.

9:1 gears on stock motor brought my scoot from 40mph to about 45 after changing roller weights, clutch springs and contra sping. If you swap in taller gears on a completely stock motor without tuning your trans to compensate, top speed will increase slightly while peak RPMÔÇÖs will be reduced. Acceleration will suffer and top speed on hill climbs will be also be lower. The stock motor just doesnt have the guts to push the taller gears at a desirable rate unless its in the peak horsepower range of about 6,500 RPMÔÇÖs. Tune the trans to stay at peak HP Rpm range and youÔÇÖll be fine.

Thanks Meat. Really helpful stuff.

Meatball wrote:9:1 gears on stock motor brought my scoot from 40mph to about 45 after changing roller weights, clutch springs and contra sping. If you swap in taller gears on a completely stock motor without tuning your trans to compensate, top speed will increase slightly while peak RPMÔÇÖs will be reduced. Acceleration will suffer and top speed on hill climbs will be also be lower. The stock motor just doesnt have the guts to push the taller gears at a desirable rate unless its in the peak horsepower range of about 6,500 RPMÔÇÖs. Tune the trans to stay at peak HP Rpm range and youÔÇÖll be fine.

So, what was the setup worked the best with the 9:1 gears on a stock motor? My 2001 Elite S has been de-restricted to match the SR (airbox, exhaust washer, and #78 jet that's arriving tomorrow), and I just put new tires and brakes on it. It may be more than I'm willing to do since it seems like you have to play with the variator and clutch to make it work right, but I'm just curious what worked best for you.