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  #1  
Old 01-28-2008, 11:53 AM
GrayRider
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Calculating RPM's without a tach

Click here, fill in the blanks and the calculations will be done for you.
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  #2  
Old 01-28-2008, 11:54 AM
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Cool, now if I just knew how many teeth on the sprockets
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  #3  
Old 01-28-2008, 02:40 PM
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Cool, now if I just knew how many teeth on the sprockets
If you were in West Virginia, it would be easy.

One, singular...tooth...

Just sayin'...
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  #4  
Old 01-28-2008, 04:17 PM
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Originally Posted by GrayRider View Post
Click here, fill in the blanks and the calculations will be done for you.
I tried doing the calculations today on my trip to the city, but every time I took my hand off the throttle to work the calculator, my speed changed.
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  #5  
Old 01-28-2008, 04:42 PM
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Originally Posted by dynageno View Post
Cool, now if I just knew how many teeth on the sprockets
If its stock primary gearing, look in your parts book and get the part number. Plug the part number into Zanotti's HD online parts or Chicago HD online parts pages and it may have the tooth count in the description. Or you could always just pull the outer primary cover and have a look.
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  #6  
Old 01-28-2008, 06:56 PM
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Gray...thanks for the no help.
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Old 01-28-2008, 06:59 PM
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I have an excel spreadsheet, I was given. If anyone is interested. PM and I will email.

Last edited by Berserker; 01-28-2008 at 07:16 PM.
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  #8  
Old 01-28-2008, 07:13 PM
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If you are going 70 mph on a 2006 or earlier twin cam you are at 3000 rpms. That is all you need to know about rpms.

Well maybe one more thing. If you twist the throtle on a 2006 or earlier twin cam and it starts to cut off you need to shift to a higher gear.

That is all.
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  #9  
Old 01-28-2008, 07:15 PM
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Originally Posted by Road Glider View Post
If you are going 70 mph on a 2006 or earlier twin cam you are at 3000 rpms. That is all you need to know about rpms.

Well maybe one more thing. If you twist the throtle on a 2006 or earlier twin cam and it starts to cut off you need to shift to a higher gear.

That is all.

A 2:1 eliminates the need to shift to a higher gear on the 2006 and older models.
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Old 01-28-2008, 07:15 PM
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Originally Posted by Road Glider View Post
Well maybe one more thing. If you twist the throtle on a 2006 or earlier twin cam and it starts to cut off you need to shift to a higher gear.

That is all.
Theres a rev limiter in 07s too. I bumped mine a little but not to 6200. Your mostly likely out of tq curve, and just motor can do it, doesn't mean its great for it.
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  #11  
Old 01-28-2008, 07:17 PM
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Originally Posted by GrayRider View Post
Click here, fill in the blanks and the calculations will be done for you.
is there a way to use this while ridding my bike in a snow and hail storm
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  #12  
Old 01-28-2008, 07:17 PM
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So are you saying all those guys who say their Harley's can do 150mph is lying?
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  #13  
Old 01-28-2008, 07:18 PM
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So are you saying all those guys who say their Harley's can do 150mph is lying?
is or are
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  #14  
Old 01-28-2008, 07:22 PM
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  #15  
Old 04-07-2008, 10:49 PM
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I can do the math, but it's easier to look at the tach.

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