Need owners imput: how fast does 3900 rpm...

[motocephalic]

in six gear equate to in MPH. I have a feeling it will be a slow ride back from the dealers with mamayama's recommended break in procedure. I was hoping one of you owners would chime in.

thanks,

Clem

 

[Jakeboy]

Clem, you made me get out the calculator and gear ratio/final drive stuff on this one! Good question! If my numbers are correct, at 3900 rpm, you should be doing 65 mph true or 104 kph true. I based this on a rear tire aspect ratio of 70 (Bridgestone Battle Wings), wheel diameter of 17", on a 150 mm wide tire, 4.068 final drive ratio and a 6th gear transmission output ratio of .929 (which is an overdrive gear, BTW). I used the constant of 336, which is commonly used in these types of calculations. The guys that own S10's will probably give you better info, but that's what the theoretical, number crunch stuff says.

My DL 1000 had an overdrive top gear and pulled it pretty well for most of the highway speeds I typically run. I'm hoping the S10 motor has that kind of mid-range torque (or close to it), to support that overdrive 6th. Japanese engineers usually do a good job of nailing down the gearing on their bikes for most riders.

I can give you the 4000 rpm numbers, but I'm being dazzled by the Superbowl Halftime Show, which is the best I've seen! And the Packers are winning!!

 

[Ollie]

Clem, you made me get out the calculator and gear ratio/final drive stuff on this one! Good question! If my numbers are correct, at 3900 rpm, you should be doing 65 mph true or 104 kph true. I based this on a rear tire aspect ratio of 70 (Bridgestone Battle Wings), wheel diameter of 17", on a 150 mm wide tire, 4.068 final drive ratio and a 6th gear transmission output ratio of .929 (which is an overdrive gear, BTW). I used the constant of 336, which is commonly used in these types of calculations. The guys that own S10's will probably give you better info, but that's what the theoretical, number crunch stuff says.

My DL 1000 had an overdrive top gear and pulled it pretty well for most of the highway speeds I typically run. I'm hoping the S10 motor has that kind of mid-range torque (or close to it), to support that overdrive 6th. Japanese engineers usually do a good job of nailing down the gearing on their bikes for most riders.

I can give you the 4000 rpm numbers, but I'm being dazzled by the Superbowl Halftime Show, which is the best I've seen! And the Packers are winning!!

How did you figure that-pretty cool! Can you show the arithmetic on your calculations?

 

[ptfjjj]

Don't know about the S10, but my Concours ran about 75 mph at about 4k in 6th. Take a look at the break in procedure offered by Mark Lawrence on his website, calsci.com. If you're inclined to try it, his method offers a way to get the bulk of the break in done during the first 50 or so miles. You may even be able most of it done on your way home from picking it up at the dealer if you can find a route that keeps you off of the interstate. You'll have to have fresh oil and filter available to do a change when you get home.

I haven't done the "hard" break in before, but reading Mark's engineering analysis on his site has got me thinking that I may try it this time. I've always done the baby the bike thing for 1K miles and hated it. If you want to read it, here's a link to his site: http://calsci.com/motorcycleinfo/NewBike.html#BreakIn

 

[Jakeboy]

How did you figure that-pretty cool! Can you show the arithmetic on your calculations?

Be glad to! Stay tuned. Never tried posting that sort of thing with this Apple MacBook Pro, but I'll try!

 

[fredz43]

On my test ride 2 weeks ago, 4,000 RPM was an indicated 80 MPH. And 5,000 RPM was......... ;D

 

[Gileam]

Hi there from South Africa! I do not know what the true speed will be, but according to the speedo my S10 does 32 km/1000rpm in 6th gear. In other words, at 4000 rpm it reads 128km/h or 80 mph. I know the speedo over reads, but it is exactly the same as my buddy’s Blackbird.

 

[motocephalic]

Clem, you made me get out the calculator and gear ratio/final drive stuff on this one! Good question! If my numbers are correct, at 3900 rpm, you should be doing 65 mph true or 104 kph true. I based this on a rear tire aspect ratio of 70 (Bridgestone Battle Wings), wheel diameter of 17", on a 150 mm wide tire, 4.068 final drive ratio and a 6th gear transmission output ratio of .929 (which is an overdrive gear, BTW). I used the constant of 336, which is commonly used in these types of calculations. The guys that own S10's will probably give you better info, but that's what the theoretical, number crunch stuff says.

My DL 1000 had an overdrive top gear and pulled it pretty well for most of the highway speeds I typically run. I'm hoping the S10 motor has that kind of mid-range torque (or close to it), to support that overdrive 6th. Japanese engineers usually do a good job of nailing down the gearing on their bikes for most riders.

I can give you the 4000 rpm numbers, but I'm being dazzled by the Superbowl Halftime Show, which is the best I've seen! And the Packers are winning!!

holy smokes, that a great work in calculations.
Now I don't have to wrry, plenty fast enough.
thanks

 

[motocephalic]

Don't know about the S10, but my Concours ran about 75 mph at about 4k in 6th. Take a look at the break in procedure offered by Mark Lawrence on his website, calsci.com. If you're inclined to try it, his method offers a way to get the bulk of the break in done during the first 50 or so miles. You may even be able most of it done on your way home from picking it up at the dealer if you can find a route that keeps you off of the interstate. You'll have to have fresh oil and filter available to do a change when you get home.

I haven't done the "hard" break in before, but reading Mark's engineering analysis on his site has got me thinking that I may try it this time. I've always done the baby the bike thing for 1K miles and hated it. If you want to read it, here's a link to his site: http://calsci.com/motorcycleinfo/NewBike.html#BreakIn

I 've done the hard break in and I saw no noticable difference, therefore, I will continue to follow mfg suggestions. I was a little worried since the strom 650 really is moving about 50 mph at 3900 rpm in sixth, it had me worried.

Clem

 

[motocephalic]

On my test ride 2 weeks ago, 4,000 RPM was an indicated 80 MPH. And 5,000 RPM was......... ;D

more than fast enough, I can't wait too test ride it in daytona next month. Makes the waiting a little less hard.

Clem

 

[motocephalic]

Hi there from South Africa! I do not know what the true speed will be, but according to the speedo my S10 does 32 km/1000rpm in 6th gear. In other words, at 4000 rpm it reads 128km/h or 80 mph. I know the speedo over reads, but it is exactly the same as my buddy’s Blackbird.

pretty much all my jap bikes have done the same, over read the MPH, but that is plenty ffast to ride it back from the dealer and stay within the guidlines of break in procedures,

thanks,

Clem

 

[RMac]

3900 rpm in 6th gear is ~126km/h (~78mph) indicated

 

[Mellow]

What's the official YAMAHA break in procedure?

 

[pqsqac]

Mellow this is directly out of the US owners manual should be the same for everyone.

Engine break-in There is never a more important period in the life of your engine than the period between 0 and 1600 km (1000 mi). For this reason, you should read the following material carefully. Since the engine is brand new, do not put an excessive load on it for the first 1600 km (1000 mi). The various parts in the engine wear and polish themselves to the correct operating clearances. During this period, prolonged full-throttle operation or any condition that might result in engine overheating must be avoided.

0–1000 km (0–600 mi)

Avoid prolonged operation above 3900

r/min. NOTICE: After 1000 km (600

mi) of operation, the engine oil and final gear oil must be changed, and the oil filter cartridge or element replaced.

1000–1600 km (600–1000 mi)

Avoid prolonged operation above 4700 r/min.

1600 km (1000 mi) and beyond The vehicle can now be operated normally.

NOTICE

_ Keep the engine speed out of the tachometer red zone.

_ If any engine trouble should occur during the engine break-in period, immediately have a Yamaha dealer check the vehicle.

What's the official YAMAHA break in procedure?

 

[johnnail]

"Avoid prolonged operation above 4700 r/min.

1600 km (1000 mi) and beyond The vehicle can now be operated normally".....


I like that. "Normally" must mean over 4700 RPM. Do you think Yamaha will subsudize my traffic tickets?

 

[Jakeboy]

holy smokes, that a great work in calculations.
Now I don't have to wrry, plenty fast enough.
thanks

I screwed up on my calculation! That's what I get for watching the Super Bowl and at the same time, doing math. I didn't double the tire aspect ratio dimension and add it to the wheel diameter. I just added it once which resulted in a smaller tire circumference, and a lower speed number.

The true speed at 3900 rpm is 77.577 mph!

There are several on-line calculators that you can use, but here's the math nerd version:

You need to know the circumference of the drive tire in ft., the drive ratio through the driveline, and the engine RPM's (which we are setting at 3900).

To get tire circumference in ft.: 150mm (tire width) x .7 (aspect ratio of tire) = 105mm. (105mm x 2) divided by 25.4 (mm per inch)= 8.268"
8.268"+ 17" (diameter of wheel)= 25.268". 25.268" x 3.1416 (this is Pi) = 79.382" or 6.615'.

To get drive ratio: Transmission 6th gear ratio is .929, Final drive ratio is 4.068. .929 x 4.068= 3.779

To get speed: Multiply 3900 rpm x 6.615' (tire circumference). Divide this result by the product of multiplying 3.779 (drive ratio) and 88 (this is a calculated constant, derived by dividing 5280 ft./mile by 60 minutes/hour).

The final calculation is: 25,798.500 divided by 332.552= 77.577 mph (or 124.899 kph for metric speedos).

Using the 7250 rpm red line gets a number of 144.214 mph (or 232.184 kph).

Sorry about mucking this up the first go around.

 

[Ollie]

Impressive! I would never have figured that out!

 

[ptfjjj]

Dude. That is incredible! Since you've obviously done this before, how close does true speed relate to actual real world road speed? Yeah, it kind of seems obvious to me that it does, but my pea brain usually has to hear the same thing two different ways before it sticks. ???

If it is as accurate as it seems to be, we should all be able to use this informaton to determine our individual speedometer error? (I noticed that you have to know the error in order to use the speedo healer.) If it is not too much trouble, can you post a few numbers that fall right on one or two of the big numbers on the tach? Like right at 4K or 5K?

Thanks,
Paul

 

[Koinz]

That's what I get for watching the Super Bowl and at the same time

Don't you know guys can't do 2 things at once, it's a proven fact! )

 

[motocephalic]

What's the official YAMAHA break in procedure?

Keeping it under 3900 RPM's for the first 600 miles. Changing the speed intervals, in other words not to drone out on the break in.

I am riding it back from the dealers so I was hoping that I could a get a little speed from it on the back roads.

Clem