brownstown racing

Mulvaney · 8/30/11, 7:40 AM

i ran with the mmsa guys for the first time this past weekend and it was great. other than i could not keep up. need gearing help. i am running a zx 900 trans gears are as follows:
1st 2.800 --42/15
2nd 2.055--37/18
3rd 1.590--35/22
4th 1.333--32/24
5th 1.153--30/26
6th 1.035--29/28
(top gear 4.490 idk what this means)
my engine by manufacturer should redline at 12,000 rpm.
it has most torque between 8500 and 9,000
and most hp 139.91@10,500

all articles i have read say it has a very nice swwet spot at around 8500
and all of these test were done in 4th gear

DAD · 9/13/11, 12:53 PM

We wind them just a little before the rev limmiter kicks in at the end of the track. Go out and listen for the rev limmiter right before the turn it will start to stutter go 1 tooth smaller on the rear end and that should be all it's worth.
You did not figure your primary ratio for your gear ratio, that is the ratio between the crank and the clutch *** primary Times trans ratio times sprocket ratio equals overall ratio. I would try about 10 or 10.5 to 1 for Brownstown with your motor. What did you have on last time out in what gear and what was the motor doing. A good tac is also a good idea.

---------- Post added at 12:53 PM ---------- Previous post was at 12:49 PM ----------

Top gear would probably be all three gears primary x trans x sprockets on the bike in 6th gear.

8/30/11, 7:40 AM	#1 brownstown racing
Mulvaney Member Join Date: Jul 2011 Posts: 168	i ran with the mmsa guys for the first time this past weekend and it was great. other than i could not keep up. need gearing help. i am running a zx 900 trans gears are as follows: 1st 2.800 --42/15 2nd 2.055--37/18 3rd 1.590--35/22 4th 1.333--32/24 5th 1.153--30/26 6th 1.035--29/28 (top gear 4.490 idk what this means) my engine by manufacturer should redline at 12,000 rpm. it has most torque between 8500 and 9,000 and most hp 139.91@10,500 all articles i have read say it has a very nice swwet spot at around 8500 and all of these test were done in 4th gear

9/13/11, 12:53 PM	#2 Re: brownstown racing
DAD Senior Member Join Date: Aug 2009 Posts: 5,957	We wind them just a little before the rev limmiter kicks in at the end of the track. Go out and listen for the rev limmiter right before the turn it will start to stutter go 1 tooth smaller on the rear end and that should be all it's worth. You did not figure your primary ratio for your gear ratio, that is the ratio between the crank and the clutch *** primary Times trans ratio times sprocket ratio equals overall ratio. I would try about 10 or 10.5 to 1 for Brownstown with your motor. What did you have on last time out in what gear and what was the motor doing. A good tac is also a good idea. ---------- Post added at 12:53 PM ---------- Previous post was at 12:49 PM ---------- Top gear would probably be all three gears primary x trans x sprockets on the bike in 6th gear.