Hi guys

Wondering, at speed youtmotor is spinning at 100kph or 62mph.

Thanks !

 

For 1987 model with the speedo on the front wheel (just as yours on the picture). Stock gearing and Michelin Macadam 90x 150/70-17 rear and 110/80-17 front it should (matematically) be:

2000rpm-52km/h
3000rpm-78km/h
4000rpm-104km/h
5000rpm-130km/h
6000rpm-156km/h
7000rpm-182km/h
8000rpm-208km/h
9000rpm-234km/h
10000rpm-260km/h
10500rpm-273km/h
---
50km/h-1923rpm
70km/h-2692rpm
90km/h-3461rpm
100km/h-3846rpm
110km/h-4230rpm
120km/h-4615rpm
140km/h-5383pm
150km/h-5768rpm
170km/h-6537rpm
190km/h-7307rpm
200km/h-7691rpm
240km/h-9229rpm
250km/h-9614rpm
258km/h-9922rpm
260km/h-10000rpm

 

for my '95, at 100kph, the engineRPM in each gear is about:
3848.53863328696 in 6th
4321.42145212184 in 5th
5037.4464490621in 4th
6063.17083914262 in 3rd
7607.83579101943 in 2nd
10123.3298832113 in 1st

 

About ! 11 decimal places doesn't qualify for the word "About"
lol

 

Wouldspeed changeas the chain climbs up thesprocket teeth?

 

Yes, but the bike will become unstable when you approach the speed of sound.

 

Yes, but if you push pass it to Light Speed then the dynamics changes due to the properties of the Space Time Continuum

 

Thanks guys !

love ya bunch !

LOL

Carl aka Dragon64

 

My '87 shows 3400 rpm at 100km/h. These had taller gearing than the younger models. Hence they had a higher top speed but slower acceleration (still does an 11sec 1/4 mile!).
These numbers don't account for inaccuracy in the guage. I'm an instrument technician by trade. Standard mechanical guages usually have an accuracy of +/-2% of the full scale reading. ie + or - 6 km/h on a 300km/h speedometer. Electronic guages (tacho) about +/-0.5% of F.S. Test guages are down to +/-0.1%.
Even when a guage is calibrated it wont make it more accurate than this. Good news is if a copper pulls you over and uses his speedo as a reference.

 

My bike revs hard, 5000@100kph with a Battleax 170 on the rear
99 model as well.