Gearing for 200mph

[Switch18]

Any clever people care to work out what gearing i need to hit the 200mph mark (assuming I have done all the tuning work). Thanks

[DeRox]

Try here: https://www.gearingcommander.com/

The H2SX is in the menu...

[Switch18]

Try here: https://www.gearingcommander.com/

The H2SX is in the menu...

Very interesting, thank you.

[H2SXadmin]

Any clever people care to work out what gearing i need to hit the 200mph mark (assuming I have done all the tuning work). Thanks

You could always check out the other resources right on this site..

https://h2sxriders.net/ -> top menu -> Specs -> H2SX Gearing Spreadsheet

The spreadsheet has been up for almost a year, and I provided all the gear ratios to Gearing Commander.

[Champ87]

I bought a Vortex 19T front sprocket from vcyclenut. According to the gearing spreadsheet that should be good for 203 mph at redline in 6th gear.

My aim is to bring down rpm for a more relaxed cruise. My target is 85 mph @5,000 rpm. For that I'll need to combine the 19T front with a 42T rear sprocket. Usually, such a change would make me concerned about the impact on acceleration. With this bike though, it feels like it's got enough guts to pull much higher gearing. I'll report when I make the change and cover enough miles to judge.

[Switch18]

Very interested to see what you think of the change.

[Champ87]

Very interested to see what you think of the change.

The test program hit a slight delay. For anyone thinking of changing the front sprocket be aware that the swap might take longer than you think (depending on how long you think it will take ).

Over the years I’ve done plenty of sprocket swaps. Simple job so I didn’t even look at the service manual. I pulled the sprocket cover, loosened the sprocket nut and slackened the chain. Quick and easy so far – until I tried to remove the sprocket. There’s a chain guard that prevents the chain being lifted away from the sprocket. No matter which way I tried I couldn’t get enough clearance to slide the sprocket off the end of the output shaft. Maybe a good time to look at the manual.

Reading the service manual, it seems that to remove that chain guide you need to remove the clutch master cylinder. To do that you need to remove the water pump cover which, in turn, involves draining coolant and removing the shift lever. I didn’t have enough time to do all that so I just put it all back to rideable condition with the original sprocket still in place.

It looks as if the sprocket could be removed if the chain is cut and rolled off the sprocket. That would be an option if I was replacing the chain but that’s not on my list right now. The sprocket swap will have to wait until I have more time. If anyone knows any shortcuts please post.

[Oyabun]

Hello

I changed the front sprocket of a yamaha fz6S2 and the speed on the scoreboard had an error that was solved by installing a module

When changing the gears in the kawasaki h2 sx I understand that the speedometer will give an erroneous reading of the speed that marks
this is so?

[Champ87]

When changing the gears in the kawasaki h2 sx I understand that the speedometer will give an erroneous reading of the speed that marks
this is so?

No. I believe the signal for the speedometer is taken from the front wheel rotation sensor so it's not affected by gearing changes. I checked this by running the bike in first gear on the center stand. There was no speed reading.

[vcyclenut]

correct, one of the benefits of traction control

we have front and rear wheel speed sensors, not sure which one the bike uses for the speedometer, probably the front like champ said

either way changing gearing will not affect the accuracy of the speedometer