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TPS Adjustment

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Old 04-28-2010, 07:22 PM
  #31  
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Originally Posted by nath981
I never started it up to measure increase ohms. Just set the tps, measure 490-500ohms, then turn the throttle and watch ohm meter and ohms will increase(engine off).
alright. I'll give that a shot and see what I get. thanks nath
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Old 04-28-2010, 07:36 PM
  #32  
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yeah no changes in resistance when I change the position of the throttle with the bike off. probably a good indicator that I didn't get the pin between the two tabs. damn
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Old 04-28-2010, 08:11 PM
  #33  
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Yeah, you definitely got the pin under both of the tabs on accident. I'm not positive about the spring positioning as you mentioned. Mine went from 500 ohms to around 1500 ohms at WOT. I would think as long as you can get those readings, you should be good.
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Old 04-28-2010, 08:16 PM
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It's difficult to explain things when i never had my tps fly apart. I know this though and you might mess with it to see if you have it together correctly. If you stand on the left side of the bike with your carbs pulled up a little, you can look down at the tab as you put the bottom of the tps up against the carb and see that the tab is heading for the space between the two prongs. Then you hold the tps up against the carb and turn it counterclockwise and let the pressure off a little and it should spring back gently. then you know you have the tab between the prongs. Now turn it clockwise til you have the holes on the mounting plate centered in the oval slot on the tps. This is where mine was standard. or you might be able to see outline on the mounting plate of where yours was set OEM. Either way, when the hole is near the center of the TPS mounting slot and this should read about 800-900ohms. If it does, you know two things: you have it back together correctly and that if you move it counterclockwise it will read lower. Then you will probably need to bend the left tab a little to get it back far enough to 490 ohm. Hope you can understand what i'm trying to describe.

Last edited by nath981; 04-28-2010 at 08:19 PM.
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Old 04-28-2010, 08:38 PM
  #35  
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+1 You could mark the TPS housing with some white out on the backside right where the tab is to keep its location in check. I put a lil dot and then lining it up with the two tabs was cake.
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Old 03-22-2011, 10:08 PM
  #36  
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i just checked my tps and it came back ~871. is this right, can it even be that much out of spec?
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Old 03-23-2011, 04:28 AM
  #37  
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Yes, it is very common for them to be at that setting right from Honda. Once you get it set to 500 ohms, you will be surprised how much smoother it will run!
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Old 03-23-2011, 07:20 AM
  #38  
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I believe that I read somewhere that the TPS was spec'd at 500 by Honda, but for whatever emissions code they knowingly have the adjustment set high. Notice no one has the TPS below 500, or really even that close to it (so it's not just the factory being sloppy). I'd guess they designed it to be at 500, but then put it at 800 and stuck some tamper resistant heads on there to make some government happy.

Remember too, this mod only adjusts the smoothness of the ignition timing at idle- after you get into the rpm's you won't notice any real difference...
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Old 03-23-2011, 07:27 AM
  #39  
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Originally Posted by 7moore7
I believe that I read somewhere that the TPS was spec'd at 500 by Honda, but for whatever emissions code they knowingly have the adjustment set high. Notice no one has the TPS below 500, or really even that close to it (so it's not just the factory being sloppy). I'd guess they designed it to be at 500, but then put it at 800 and stuck some tamper resistant heads on there to make some government happy.

Remember too, this mod only adjusts the smoothness of the ignition timing at idle- after you get into the rpm's you won't notice any real difference...
I was able to get my TPS EXACTLY 500 ohms, but had to elongate the screw slots a little. I have also done a few of these in my shop for customers, always been able to get anywhere from 480-510 depending on the unit.
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Old 03-23-2011, 07:48 AM
  #40  
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You'll notice a difference from idle to full advance.
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Old 03-23-2011, 09:03 AM
  #41  
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how does the bike even run if the TPS is set that far out from factory?
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Old 03-23-2011, 09:08 AM
  #42  
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Originally Posted by thetophatflash
You'll notice a difference from idle to full advance.
According to articles on the TPS this is correct... I hadn't had my bike fired up long enough to tell yet
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Old 03-23-2011, 09:27 AM
  #43  
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Originally Posted by 7moore7
I believe that I read somewhere that the TPS was spec'd at 500 by Honda, but for whatever emissions code they knowingly have the adjustment set high. Notice no one has the TPS below 500, or really even that close to it (so it's not just the factory being sloppy). I'd guess they designed it to be at 500, but then put it at 800 and stuck some tamper resistant heads on there to make some government happy.

Remember too, this mod only adjusts the smoothness of the ignition timing at idle- after you get into the rpm's you won't notice any real difference...
it better do more then idle timing. my idle is freakin perfect. its my cruising that sucks donkey *****.
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Old 03-23-2011, 09:48 AM
  #44  
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Originally Posted by nykuryu
it better do more then idle timing. my idle is freakin perfect. its my cruising that sucks donkey *****.
It should smoothe her right out. Did it for mine.
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Old 03-23-2011, 09:53 AM
  #45  
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and to be clear, im just touching the top and middle pins of the tps with my multi- meter leads? i have the meter set at 2000 ohms since the next lowest is 200
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Old 03-23-2011, 12:51 PM
  #46  
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ever since i did this the bike starts MUCH easier
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Old 03-23-2011, 01:45 PM
  #47  
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Originally Posted by jay956
ever since i did this the bike starts MUCH easier
my post above your last, is that how you checked your tps?
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Old 03-23-2011, 01:52 PM
  #48  
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Originally Posted by 7moore7
I believe that I read somewhere that the TPS was spec'd at 500 by Honda, but for whatever emissions code they knowingly have the adjustment set high. Notice no one has the TPS below 500, or really even that close to it (so it's not just the factory being sloppy). I'd guess they designed it to be at 500, but then put it at 800 and stuck some tamper resistant heads on there to make some government happy.

Remember too, this mod only adjusts the smoothness of the ignition timing at idle- after you get into the rpm's you won't notice any real difference...
What Honda does is run the engine on a dyno and sets the TPS using an emission sensor in the exhaust. They set it to the lowest emission at idle. That is why they are all set a little different and also the reason for tamper resistant fasteners.

So 500 ohms is the spec for power. I have heard of one person claiming 430ohms was a better set up, but I don't have any (or seen any) numbers to back the claim up.
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Old 03-23-2011, 05:59 PM
  #49  
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Originally Posted by nykuryu
my post above your last, is that how you checked your tps?
i believe so, but its been a while. your not gonna get a reading if you touch the wrong ones...
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