"Butt Dyno TPI" - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

 
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post #1 of 7 Old 10-27-2013, 01:43 PM Thread Starter
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"Butt Dyno TPI"

Hi, this will probably be 'old news" to some but, I'd like to share pics of the throttle position indicator (TPI) I used while adjusting my KLR's needle and idle mixtures. It was difficult to be sure which mixture circuit was in play prior to installing the TPI. Using a permanent marker allows the TPI to work in all weather conditions. Take care to check it's calibration from time to time as the throttle grip will tend to move relative to the throttle barrel if full throttle is used aggressively.
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File Type: jpg 131013 TPI 1.JPG (71.8 KB, 23 views)
File Type: jpg 131013 TPI 2.JPG (69.3 KB, 20 views)
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post #2 of 7 Old 10-27-2013, 02:58 PM
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Excellent!

A stationary "witness mark" might be used to obtain perspective on the relative position of the rotatable throttle tube . . .
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post #3 of 7 Old 10-27-2013, 03:54 PM
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Nice!! I do my jetting the old way also. Those meters may be able to get thing "perfect" in the garage but still aren't perfect once the weather changes ect... Actual know-how will get you home when something doesn't work and you can't ask the computer what is wrong
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post #4 of 7 Old 10-27-2013, 04:26 PM
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great idea, get it set then dummy proof it.

Never ride faster than your angels can fly
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post #5 of 7 Old 10-27-2013, 05:27 PM Thread Starter
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Warning

A small warning to anyone trying this TPI. It will tell you the truth about your riding style and the the truth can be hard.

In my case the truth is that 98 percent of my riding is done at a quarter throttle with one percent below a quarter and one percent above a quarter.
(ymmv)
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post #6 of 7 Old 10-28-2013, 11:27 AM
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That's pretty much standard procedure for those carbs that have the slide controlled directly by the throttle cable. With a CV carb, the throttle tube position doesn't necessarily correspond to the exact slide position so there is some ambiguity.

Ron
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post #7 of 7 Old 10-28-2013, 11:55 AM Thread Starter
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Quote:
Originally Posted by Ranger Ron View Post
That's pretty much standard procedure for those carbs that have the slide controlled directly by the throttle cable. With a CV carb, the throttle tube position doesn't necessarily correspond to the exact slide position so there is some ambiguity.

Ron
Yes, that's true Ron. CV carbs that have good diaphragms and slides will be close to the indicated position of the "butt dyno TPI" but not exactly. (Hence the "butt dyno" in the name) If your TPI is at a quarter throttle and your speedo is indicating 20mph in 5th gear, you may have a carburetor mechanical problem or a TPI calibration problem. For example, quarter throttle + 5th gear on my KLR gives me about 55mph. Using that as a baseline, I messed around with the needle and idle screw until it all smoothed out. I'm still working on 1/8 throttle.
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