Throttle Position Sensor - 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 10 Old 03-14-2011, 12:13 PM Thread Starter
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Throttle Position Sensor

OK, I'm kinda going geeky here.

I'm into tuning the KLR, using an Innovate LM-2. I've got the RPM feed hooked up, but it isn't working right yet - too much ringing on the signal. That I will get sorted in a day or two.

As I look at the data I find it would be better to have an idea of what the throttle position is.

Anybody got an idea of how to hook up a TPS to the Keihin CVK40? I've Googled for applications where the CVK might have a TPS, but can find nothing.

I can buy a TPS from Innovate, a generic thing, but they are designed to mount on a car carburetor.

Anybody got any ideas?

T

ps - I'm also thinking of installing a MAP sensor, and that seems like a fairly straight forward dealio. any thoughts on that would be appreciated.

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“On the way downtown I stopped at a bar and had a couple of double Scotches. They didn't do me any good. All they did was make me think of Silver-Wig, and I never saw her again.” -Philip Marlowe

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post #2 of 10 Old 03-14-2011, 12:42 PM
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Can't think of an easy way to mount on the carb. Can you temporarily use the throttle's "push" cable to operate the TPS? A TPS is just a rheostat right?

Gray-haired riders don’t get that way from pure luck.

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post #3 of 10 Old 03-14-2011, 12:46 PM Thread Starter
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flash -

I think it's just a rheostat, yes.

Looking at it, if I could find one that had a bit of a nub sticking out I could fab up a bracket and use a bell-crank to turn it. There is that big, flat plate that hits the throttle stop that could be used to mount one end of the bell-crank.

I wish I had one to hold in my hand so I could think better.

Sure wish Sportsters had a TPS...


T

Tom [email protected]

“On the way downtown I stopped at a bar and had a couple of double Scotches. They didn't do me any good. All they did was make me think of Silver-Wig, and I never saw her again.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte

Sting like a butterfly.
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post #4 of 10 Old 03-14-2011, 02:30 PM
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Quote:
Originally Posted by Tom Schmitz View Post
flash -

I think it's just a rheostat, yes.

Looking at it, if I could find one that had a bit of a nub sticking out I could fab up a bracket and use a bell-crank to turn it. There is that big, flat plate that hits the throttle stop that could be used to mount one end of the bell-crank.

I wish I had one to hold in my hand so I could think better.

Sure wish Sportsters had a TPS...


T

Your just wanting to see what jet circuit your on related to throttle position?
Masking tape on the throttle, make some marks? Throttle lock to hold position?

Or am I not understanding at all?

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #5 of 10 Old 03-14-2011, 03:20 PM Thread Starter
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Spec -

The LM-2 is capable of logging AFR and RPM, as well as four other analog inputs.

If I had a MAP sensor and a TPS I could see a graph of my AFR, the RPM what the vacuum was, and the relative throttle position.

Here's a typical graph (not mine):



With a graph like this of a run, I'd be able to go to any point in the run adn see what AFR I was getting, what the RPM was vs the throttle position.

This is helpful because, returning home from a run, it's hard to remember what you were doing at any particular point.

My objective is to have a normal mixture at both idle and cruise, but a richer mixture at large throttle openings. Right now I'm almost there, but have my cruising mixture a bit rich. Probably just need to drop the needle.

This MAP and TP sensor stuff is just me playing. I mean, I'm but a poor pensioner now with nothing to do...

T

Tom [email protected]

“On the way downtown I stopped at a bar and had a couple of double Scotches. They didn't do me any good. All they did was make me think of Silver-Wig, and I never saw her again.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte

Sting like a butterfly.
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post #6 of 10 Old 03-14-2011, 03:35 PM
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Is it just me or should Tom be riding a much more complicated machine. Like an F-18?

Just kidding brother, keep tinkering. You'll make it to the moon yet.

or

"It will fly eventually" Tom said loftily.

(You thought I was joking about the hovercraft, huh?)




"In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV." R. Pirsig

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post #7 of 10 Old 03-14-2011, 03:49 PM Thread Starter
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I'm going on a real ride next week. Honest. Four days down Sandy Eggo way, out the Sunrise Highway.

"I'm an inveterate tinkerer", Tom said dam-edly.

T

Tom [email protected]

“On the way downtown I stopped at a bar and had a couple of double Scotches. They didn't do me any good. All they did was make me think of Silver-Wig, and I never saw her again.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte

Sting like a butterfly.
Noli Timere Messorem
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post #8 of 10 Old 03-14-2011, 03:55 PM
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Originally Posted by Lockjaw View Post

Is it just me or should Tom be riding a much more complicated machine. Like an F-18?

....

Uh yea... me I'm just needing to know the oil used:rpm

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #9 of 10 Old 03-14-2011, 04:28 PM Thread Starter
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OK, guys. I can read between the lines.

I'll be looking for a 12 step program, then getting back to riding....

T

Tom [email protected]

“On the way downtown I stopped at a bar and had a couple of double Scotches. They didn't do me any good. All they did was make me think of Silver-Wig, and I never saw her again.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte

Sting like a butterfly.
Noli Timere Messorem
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post #10 of 10 Old 05-09-2011, 11:52 PM
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what about a new model KLR? They have a TPS
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