Member Contributer Wald Posted April 1, 2021 Member Contributer Share Posted April 1, 2021 Link to comment Share on other sites More sharing options...
Member Contributer adkfinn Posted April 1, 2021 Member Contributer Share Posted April 1, 2021 https://en.wikipedia.org/wiki/NACA_duct https://www.partzilla.com/catalog/honda/motorcycle/1997/vfr750f-a-vfr/lower-cowl Link to comment Share on other sites More sharing options...
Member Contributer Dutchy Posted April 1, 2021 Member Contributer Share Posted April 1, 2021 46 minutes ago, adkfinn said: https://en.wikipedia.org/wiki/NACA_duct Don't think he is after NACA's... But after #25 and #26 Link to comment Share on other sites More sharing options...
Member Contributer Wald Posted April 1, 2021 Author Member Contributer Share Posted April 1, 2021 Thanks Dutchy, this is correct #25 and #26. I have checked several site in US, not available anymore. I found a site in Germany which sells it but this will be the last option. Thank you, BTW, how accurate is the Tachometer on the 94-97 VFR? It seems that mine is about 5-8 mph too optimistic (or maybe I am going faster than I think?!) Link to comment Share on other sites More sharing options...
Member Contributer DannoXYZ Posted April 1, 2021 Member Contributer Share Posted April 1, 2021 speedo or tach? U.S. law says speedo can never indicate slower speed than actual. So most manufacturers err on side of caution and have speedo read about 10% too fast. Going 50mph will show 55mph. Displayed 110mph is really 100mph. Link to comment Share on other sites More sharing options...
Member Contributer Wald Posted April 1, 2021 Author Member Contributer Share Posted April 1, 2021 27 minutes ago, DannoXYZ said: speedo or tach? U.S. law says speedo can never indicate slower speed than actual. So most manufacturers err on side of caution and have speedo read about 10% too fast. Going 50mph will show 55mph. Displayed 110mph is really 100mph. 27 minutes ago, DannoXYZ said: speedo or tach? U.S. law says speedo can never indicate slower speed than actual. So most manufacturers err on side of caution and have speedo read about 10% too fast. Going 50mph will show 55mph. Displayed 110mph is really 100mph. Thanks, I meant speedo. In this case it makes sense. I had it at 110 and it did not feel like it. My hornet has a digital speedo which is only 2-3 mph off. Quote Thanks Dutchy, this is correct #25 and #26. I have checked several site in US, not available anymore. I found a site in Germany which sells it but this will be the last option. Thank you, BTW, how accurate is the Tachometer on the 94-97 VFR? It seems that mine is about 5-8 mph too optimistic (or maybe I am going faster than I think?!) Link to comment Share on other sites More sharing options...
Magneto Posted April 1, 2021 Share Posted April 1, 2021 This site is bit difficult to do quotes, there is a line to click that deletes quote that system carries over from previous post.... Link to comment Share on other sites More sharing options...
Member Contributer RobF Posted April 1, 2021 Member Contributer Share Posted April 1, 2021 4 hours ago, Wald said: BTW, how accurate is the Tachometer on the 94-97 VFR? It seems that mine is about 5-8 mph too optimistic (or maybe I am going faster than I think?!) It's the Brits wot done this: http://www.oecbi.com/blog/vehicle-speedometer-accuracy-how-fast-are-we-really-going U.S. law specifies a +/- accuracy. UK regulations prohibit a speedometer that under-indicates speed. Link to comment Share on other sites More sharing options...
Magneto Posted April 1, 2021 Share Posted April 1, 2021 Leave them brits alone, they have other problems 😉 It is actually United Nations: “UNIFORM PROVISIONS CONCERNING THE APPROVAL OF VEHICLES WITH REGARD TO THE SPEEDOMETER EQUIPMENT INCLUDING ITS INSTALLATION” https://unece.org/fileadmin/DAM/trans/main/wp29/wp29regs/r039r1e.pdf Link to comment Share on other sites More sharing options...
Member Contributer Wald Posted April 2, 2021 Author Member Contributer Share Posted April 2, 2021 Thanks Magneto. Just browsed through the link you attached, the only involvement missing is the church! Bureaucracy at its best! Thanks all for Comments. Link to comment Share on other sites More sharing options...
Member Contributer MaxSwell Posted April 2, 2021 Member Contributer Share Posted April 2, 2021 I have measured the speedometer error to be ~ 8.8% optimistic (higher than actual speeds) on each of my fifth gens. Link to comment Share on other sites More sharing options...
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