The difference between 9:1 and the 8.44:1

[DorkoElite303]

From a user experience, is there much difference between the acceleration of the 9:1 and the 8.44:1 gear setup?

I'm going to be doing a mini-stroker set-up with a 72cc corsa with all the bells and whistles. I want a torque monster with a over 75+mph top speed. (something that will wheelie right off the throttle)

[Wheelman-111]

Greetings:

And I want a scooter that's competitive on the roadrace circuit, competent as a long-distance sport-tourer, and can also win Motocross races. Oh, and uses solar power.

Wouldn't it be nice if you could have it all?

Kidding aside, I went from 11:1 down to ~8:1. It's not completely sorted out yet, but the pickup is decidedly more liesurely from 0-15. Above that frankly I can't tell the difference. Top speed definitely higher, simply because the gearing permits speed without engine over-rev. But you have to have the power to get there. That's where I'm working on it.

Wheelies are easy with a rear-engined bike that weighs 125 pounds. I can do them with the ignition switch off.

[burnt_toast]

From a user experience, is there much difference between the acceleration of the 9:1 and the 8.44:1 gear setup?

I'm going to be doing a mini-stroker set-up with a 72cc corsa with all the bells and whistles. I want a torque monster with a over 75+mph top speed. (something that will wheelie right off the throttle)

Then get 8.44:1 gears and a Malossi full counter crank. one for sale on hawaii forums now for like $300

Do both, tune well and you'll get your 75+mph and gobs of torque goal garanz

Otherwise ministroke + Corsa + all matching performance parts will net 70mph top speed but not much more. I know for a fact since this is my setup but using 7:1 malossi gearing, I've GPS'd 74.5mph at best with no low pro mirrors. Recent check shows I'm doing 68-71mph gps on trips to school, and thats flat out top speed with stock mirrors. (They reduce top speed by about 3-4mph, but SOO much more functional than the low pros)

[DorkoElite303]

So I guess all said and done. If 8.44:1 isn't going to give me any more top speed then 70mph, should I just go with 9:1 gearing for all the torque?

I'm planning on sticking with the ministroker.

[veedubh20]

throw away taiwan m/s crank,

just use honda or malossi crank.

the best pipe is pglong

[burnt_toast]

So I guess all said and done. If 8.44:1 isn't going to give me any more top speed then 70mph, should I just go with 9:1 gearing for all the torque?

I'm planning on sticking with the ministroker.

I guess dude, but then it'll drop your top speed to mid 60's at best i bet. not bad but far from your goal

should be quick as shh though with ministroke, and I like Ruima they're tried and true in my book

[steffen707]

Is ruima the company that makes that stroker crank? Also, can you use that stroker crank with any old bore kit, or do you have to have a special kit? Since the piston is traveling farther up and down the cylinder?

[DorkoElite303]

So I guess all said and done. If 8.44:1 isn't going to give me any more top speed then 70mph, should I just go with 9:1 gearing for all the torque?

I'm planning on sticking with the ministroker.

I guess dude, but then it'll drop your top speed to mid 60's at best i bet. not bad but far from your goal

should be quick as shh though with ministroke, and I like Ruima they're tried and true in my book

So it's not possible to reach 70mph with 9:1??????? Or that is only a downhill speed?

[burnt_toast]

Probably possible, but would be winding it out dunno for sure havent tried that gear combo

I would vote for the 8.44:1 if going for 70cc range

[losthope]

alaskairhog got his bike to go 75mph with 8:4:1 gears and stock crank.

[veedubh20]

So I guess all said and done. If 8.44:1 isn't going to give me any more top speed then 70mph, should I just go with 9:1 gearing for all the torque?

I'm planning on sticking with the ministroker.

I guess dude, but then it'll drop your top speed to mid 60's at best i bet. not bad but far from your goal

should be quick as shh though with ministroke, and I like Ruima they're tried and true in my book

So it's not possible to reach 70mph with 9:1??????? Or that is only a downhill speed?

can got over 70mph on contesta bore-stock dd50 crank /28mmpwk/ct/9:1- pg long both 1500 springs. may vary on tune and rider weight. Note: intake port is small than dio port. Well on flat road near sea level. rider- 115lb.

[jesse1234]

just to make sure I understand correctly,

bigger gear, higher top end less low end acceleration (like starting a car in a higher gear)?

so a 9:1 has more pickup initially than, say, a 6:1 (hypothetical, I don't think they go that low.....)

[evilone]

You got it.

[burnt_toast]

just to make sure I understand correctly,

bigger gear, higher top end less low end acceleration (like starting a car in a higher gear)?

so a 9:1 has more pickup initially than, say, a 6:1 (hypothetical, I don't think they go that low.....)

seen em go to 5:1 even 4:1 on some strokers

[steffen707]

just to make sure I understand correctly,

bigger gear, higher top end less low end acceleration (like starting a car in a higher gear)?

so a 9:1 has more pickup initially than, say, a 6:1 (hypothetical, I don't think they go that low.....)

You are right that a 9:1 has more pickup than a 6:1; however, a stock elite has something like a 12:1 final ratio. So the 9:1 gears will give more top end, less acceleration than the stock gears.