Adjust the TPS on Husqvarna TC125 (and KTM 125SX), and set base value
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- เผยแพร่เมื่อ 21 พ.ย. 2024
- How to adjust the TPS (Throttle Position Sensor) on a 2023 TC125 (also applies to KTM 125SX) for better performance, and how to check the base value as delivered from the factory, and set back to factory defaults.
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Hello... question
Would appreciate any suggestions. 2012 Polaris 800 EFI hesitates at 45-50 mph. 45 is about 6350rpm. Not really a sputter or cough. Repairman just cleaned throttle body and fuel injectors and said idle air circuit was partially open causing a misfire at that speed. Work did not solve the issue. He set the TPS at.730 as per factory specs...One person suggested the primary and secondary cluthes might be fighting each other. Need to get it fixed pretty quick so we can sell it and move, but I want it to be right. I should also mention that it has full power no issues 0-45. No codes, no engine light. Always at that speed only.Thanks folks. Appreciate anything.
Thanks for your comment. That's a tricky one to diagnose from here. If you're in the bottom 1/2 or 1/3 of the throttle when the hesitation happens, then a TPS adjustment is more likely to affect it than if you're closer to full throttle. It wouldn't hurt to try tweaking it a little higher (richer) or lower (leaner) to see what happens, make changes about 0.02V at a time. But that said, it could be a number of things. Check all the basics first. If that year has an IAC valve then definitely make sure that valve is working and not stuck or dirty. Replace the fuel filter if it hasn't been replaced to be sure it's not restricting flow. Also make sure the fuel pressure is correct and that the injector spray pattern is OK. I realize they just cleaned the injectors, but it doesn't hurt to double check the spray pattern. Also make sure the spark plug wire and plug itself are OK. Also check the wiring harnesses carefully for any wear spots, several Polaris models have known issues with wires rubbing on various parts and eventually wearing through the insulation. Also make sure the air filter is clean, exhaust (spark arrestor) isn't plugged with carbon, and make sure the gas is good. Lots to check, but this is the best I can come up with off the top of my head. Good luck and please post back to let us know when you figure it out!
@@TPSTool Thank you. I'll let you know what I find out.
@@TPSTool Thank You for your response. I have some new information on the 2012 Polaris 800 Razor having issues at 45mph.
I was asked if it could go faster than 45mph. Just took it for another test. As usual it hesitates at 45mph. I pushed it on a longer stretch and when it gets to 50mph it stops hesitating. When I get to 55mph it hesitates again. Top speed is 60 mph at a maximum of 6500 rpm.
To obtain codes, one video suggested turning the key off and on 3 times and it will show a code. Didn’t see anything pop up when I tried it. I don’t know if this 800 has the ability to display any codes?
I’d like to include some responses from folks kind enough to offer suggestions to see if it triggers any other ideas pointing to one thing.
The spark plugs were replaced about 1.5 years ago. They were examined recently and found to be good. I still might replace them as that’s a cheaper item. I suppose it could be a bad spark plug wire.. or coil wire. Your thoughts?
Suggestions: fuel pressure check, sounds like fuel pump, spray water on spark plug wires and coil wire, Fuel stabilizer, Belt might be slipping, inspect clutches and belts, don’t think its clutch related, sounds like clutches sticking, check belt for damage, weights in primary clutch are too light, was IAC mechanically stuck open or electrically being opened.
Thanks again. I’m hoping this new information might directly point to something that I will try and tackle on my own. Taking it in is a last resort for me.
I promise, to get back to you once I find the issue!
Thank you kindly. Very much appreciated.
Dave
@@davepo6443 I think you're on the correct approach to just go item by item methodically, removing things from the list. I would definitely replace the spark plugs, it's cheap and easy. Also keep an eye on the RPMs, just in case it's possible that the clutch/belt is slipping and the motor is hitting the rev limiter, which would feel like a stumble. I'm curious to hear what you find. :)
@@TPSTool I called the repairman.. I printed off all the suggestions offered for him. Also removed senders contact info before doing so. He feels bad.
He said the factory setting for TPS was .73 and thats where he set it at.
He said he will fix the issue labor free and if parts are under 100.00 he'll eat it. If over 100.00 we'll talk, but at his cost.
With all the suggestions it seems like it's pointing at the following: possible fuel pump which he checked, but not at high speed, a clutch and belt inspection or issue, spraying water on old ones first. I don't know how old the wires are so probably worth doing. I did suggest a rebuild kit for fuel pump he said no they can still have a problem and he would go with an All Balls fuel pump if needed. He has a great reputation in town for doing things right. Thank you again, I'll let you know what the verdict is.