grampi

I've been hearing the stock gearing on the Hawk is too tall. What is a good sprocket combination that increases acceleration without making the top gear highway speed RPM's too high (I'd say keeping it at or around 3500 RPM @ 60 MPH)? I've heard a 15/43 is a good combo, but what does it put the top gear RPM at? Also, is there a rule of thumb that indicates how much your top gear RPM will increase by dropping a tooth on the front sprocket, or adding a tooth on the rear?

superhawk22

I have 2 set-ups right now, I use the 15/43 for the track I ride because it's tight and top speed isn't a great concern. On the street I use a 15/41 because I was always looking for 7th gear. It wasn't about top speed just like you said it was the RPM's it was just a little too high on the street.

grampi

Isn't 15/41 the stock gearing? I'm trying to find out what would be a good compromise between the stock gearing (which many people say is too tall), and gearing it down a bit without going overboard and bringing the top gear RPM's up too high. I actually went and saw a Honda scooter mechanic today who owns a SH. He said he just dropped one tooth on the front sprocket and the acceleration gain was very noticeable. Others have said they've dropped a tooth on the front and two on the rear, but I'd guess that would really bring the top gear RPM up.

superhawk22

No, stock gearing is 16/41. :wink:

grampi

Is it tough keeping the front wheel on the ground with the 15/43 setup? What RPM does it turn at 60 MPH in top gear with the 15/41 setup?

superhawk22

The front is a little light but if you're experienced you can keep it down. It's a little hard to really hammer it in 1st without it comming up but it's a controlled power wheelie. I'll have to get back to you on the 15/41 RPM around 60 because I don't really pay attention to mph on the track. It's not that hard to swap so I'll get back to you on that.

mikstr

Here is a link that may help:
http://ozfirestorm.proboards34.com/i...ead=1107340911

It has an Excel spreadsheet for figuring out the actual speed in every gear with different gearng combos. A 15/43 combo generates about 25 km/h for very thousand rpm.

So, 100 km/h is roughly 60 mph, so your engine rpm would be @ 4K (or extremely close ot it)

cheers
Mikstr