17/42 gearing correction factor?

[kml]

I have a 42 rear on the way, as well as a speedhealer. The front sprocket is the stock 17. I was wondering if anyone else has run this combo with the speedohealer and can give me a ball park figure as to how much the correction factor will be when the stock discrepancy is combined with the lower ratio 42 rear sprocket. I hope that made sense.

cheers
ken

 

[JQBusa]

just use the calculator. It will give you step by step.

 

[kml]

Thanks for the link to the calculator!
Is the default 5.5 % correction the factor applicable to a stock busa?

cheers
ken

 

[Rhythm]

Someone stated their 185 mph gauges was off by 7%.

 

[kml]

(Rhythm @ Feb. 10 2007,15:32) Someone stated their 185 mph gauges was off by 7%.

Thanks Rhythm!

I should a known you'd be in the know...

cheers
ken

 

[dadofthree]

Roughly 7%, but with some gear changes the speedo is nearly corrected. Someone had all this info up this year. I just keep guessing at mine. 5 MPH below 100 and 10 MPH above. Oh crap; scratch that 5 MPH at 55.