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You would be 5% closer to the actual speed of the bike. As the stock speedo is about 7% off, you are getting close to being right on. I would guess that true 60 is showing about 62 on the speedo.
+1....
some have gone +1 front and find the speedo is perfect, going -2 rear will get you closer.... best bet.... got a GPS? fairly accurate way tell.
You would be 5% closer to the actual speed of the bike. As the stock speedo is about 7% off, you are getting close to being right on. I would guess that true 60 is showing about 62 on the speedo.
My best guess is because this is a starter bike for most people and Yamaha wants someone who is getting used to riding to have that false sense of speed while possibly keeping them from getting a ticket. If you can wrap your head around my train of thought that might make sense. Or it could just be because digital equipment isn't as accurate as everyone thinks it is.
i also have +1/-3 and really like it, no need to slip the clutch pulling away - which is what worried me.I run +1/-3 on mine. Did the +1 1st, GPS verified as spot on. +1 is a 6.25% change to be correct. By taking away 2 on the back, that's 4.34% of a change. I didnt like being 'right on'. Don't want to be off as far as the stock was, but when buzzing 70 in a 55, that extra 3mph I have calibrated would put me at real speed of 67, possibly saving me a ticket. After a while, you kinda forget that you have it set a bit high and you just end up driving 2-3 mph slower than you think. I had to use the speedo-healer after doing the +1/-3 to get it that way, I was underwater on it after that and you don't want to be riding 70 when you are actually doing 75! That's trouble.
Kinda like setting your alarm clock 10 mins early so when you sleep in a bit, you still end up getting up on time! Anybody do that? (I did/do).
Just installed a Vortex Racing -2 rear sprocket. Obv speedometer is the same but the bike is going much faster. Anyone know how much its off in MPH?
Thanks
Derek