TPS adjustment problem - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
 
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post #1 of 3 (permalink) Old 06-23-2016, 11:59 AM Thread Starter
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TPS adjustment problem

Well, I've been getting my 2003 V-Star 1100 back in riding condition. I cleaned out the carbs real well, changed the oil, took it for a few rides. At first, it went very well. Then, I started getting severe bogging with the throttle wide open, then just severe bogging or loss of power across the board. My assumption was that I screwed up something in the carbs. So I started taking them off again, and noticed that my TPS was loose. The screws had been replaced with philips head screws, so I started the adjustment process, per the service manual and many other sources.

When I adjusted the TPS to what was within the limits prescribed (my low end was about 800 ohms, and the wide-open was about 5k, but this was within the tolerance in the manual. I should note that I could not adjust (by turning clockwise on the carb) the sensor any more, so I could not get the lower bound of it below 800 ohm. If I turned it counterclockwise, the range went up outside the ok range.

But starting it again yielded similar results. Bogging under open throttle or under engine load, a smell of rich gas, etc. After a decently long ride with the "correctly" adjusted TPS, and I just made it home before the engine did what really looked like it had flooded - while riding. Rich exhaust smell, consumed a lot of gas, couldn't start again right away, but it did start the next day.

I've tried testing from the point under the seat, with the same results. I tried re-positioning the sensor to where it was physically (more towards the center of its adjustable range) to no avail.

I guess my questions are these:

1. Could my seemingly problem of running super rich (to the point of flooding while running to eventually flooding to stalling) be caused by a bad TPS or TPS misadjustment? Is running rich even my problem?

2. Do the sensors often fail like this, and is it replaceable? Or should I still be looking to the guts of my carbs for rich running? Or what other performance information can I gather to more effectively troubleshoot?
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post #2 of 3 (permalink) Old 06-23-2016, 01:50 PM
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If the TPS is in spec you problem is probable elsewhere. You probably need to get back into the carbs and check them out. Sounds like it could be a needle that's popped out. That's where I'd go....

It's hard to say if it's running rich because we aren't there to see it. Pull the plugs and take a look, that'll tell ya.

Sick Mick* 2006 V Star 1100 Custom

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post #3 of 3 (permalink) Old 06-23-2016, 04:20 PM
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Originally Posted by captainregular View Post
Well, I've been getting my 2003 V-Star 1100 back in riding condition. I cleaned out the carbs real well, changed the oil, took it for a few rides. At first, it went very well. Then, I started getting severe bogging with the throttle wide open, then just severe bogging or loss of power across the board. My assumption was that I screwed up something in the carbs. So I started taking them off again, and noticed that my TPS was loose. The screws had been replaced with philips head screws, so I started the adjustment process, per the service manual and many other sources.

When I adjusted the TPS to what was within the limits prescribed (my low end was about 800 ohms, and the wide-open was about 5k, but this was within the tolerance in the manual. I should note that I could not adjust (by turning clockwise on the carb) the sensor any more, so I could not get the lower bound of it below 800 ohm. If I turned it counterclockwise, the range went up outside the ok range.

But starting it again yielded similar results. Bogging under open throttle or under engine load, a smell of rich gas, etc. After a decently long ride with the "correctly" adjusted TPS, and I just made it home before the engine did what really looked like it had flooded - while riding. Rich exhaust smell, consumed a lot of gas, couldn't start again right away, but it did start the next day.

I've tried testing from the point under the seat, with the same results. I tried re-positioning the sensor to where it was physically (more towards the center of its adjustable range) to no avail.

I guess my questions are these:

1. Could my seemingly problem of running super rich (to the point of flooding while running to eventually flooding to stalling) be caused by a bad TPS or TPS misadjustment? Is running rich even my problem?

2. Do the sensors often fail like this, and is it replaceable? Or should I still be looking to the guts of my carbs for rich running? Or what other performance information can I gather to more effectively troubleshoot?
the TPS has nothing to do with fuel delivery it only controls the ignition timing curve, i forgot to plug mine in once after working on the carbs and the bike ran ok it just had a little hesitation, if the engine is flooding start thinking the floats or a busted choke cable. the TPS can't alter the initial timing or the full advance marks only the curve between them

dumb bikers don't get to be old bikers

Last edited by pauli466; 06-23-2016 at 04:23 PM.
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