05-07-2022, 02:58 PM | #1 |
Join Date: Sep 2019
Posts: 14
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[SOLVED] KPR 200 dies in the heat. Help!
Hey guys, I'm having an issue with my 2021 Lifan KPR 200. The bike has run strong since I bought it, but on the first 85°+ day this year I couldn't get the engine passed 3500 RPM without it just cutting out and dying. I took my car to work instead, and when I came back home at around 11:00 p.m, it worked fine. I had the same experience a couple days later when we had the same temperatures. Everything is fine up to a quarter throttle, after that it just shuts off like I hit the kill switch. I keep the bike outside under a cover, but there's really no shade so it gets quite hot. Is this something to do with the thermal protection system? If so, can I just replace the thermometer with a certain value resistor?
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2019 Hawk 250 - PWK carb, NIBBI throttle cable, Bitwell whisky throttle, digital dash, CRF230F titanium exaust, NGK spark plug, o-ring chain, old/locking style gas tank, 17t front sprocket, 39t rear sprocket, OKSTNO mirrors, LED headlight, GUB phone mount, ATLAS throttle lock, more to come. Lifan KPR 200 - Stock. For now... Last edited by swolff; 05-31-2022 at 01:30 PM. Reason: Solved |
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05-07-2022, 03:49 PM | #2 |
Join Date: Sep 2021
Location: De Soto, MO
Posts: 1,976
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What valve clearances are you running? If they are too tight (and they do get tighter with use), then you are getting no breathing, so it dies. An internal combustion motor is just an air pump, driven by gas explosions. Especially the exhaust valve tends to get hot because it does not have fresh cool gasoline vapor coming across it like the intake valve does to cool it off. The exhaust valve gets the hot burned gases. So typically the exhaust valve is set slightly looser for that reason. Lifan recommends .06mm for both. That's .002" BTW.
This may also have contributed to your earlier problem that you thought was the carb. And of course the higher the ambient temp, the more likely you are to experience this.
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2021 Lifan Xpect--sold 2022 Lifan KPX 1972 Honda CT90--The Carrot 1969 Honda CT90--The Tomahto Cheesy is the WDK (workplace drama king). Now retired. Nope, back in the saddle. Nope, finally retired. Climate: The Movie https://www.youtube.com/watch?v=A24fWmNA6lM How our government really works https://www.youtube.com/watch?v=QjadCd0VRBw Question all authority.....think for yourself Last edited by TominMO; 06-17-2022 at 06:25 PM. |
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05-07-2022, 04:24 PM | #3 |
Join Date: Sep 2019
Posts: 14
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I'm not sure what the clearances are. I haven't touched any of the internals on this bike. I will get my feeler gauges and report back. I am positive it's not a carb issue however; it's a fuel injected bike.
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2019 Hawk 250 - PWK carb, NIBBI throttle cable, Bitwell whisky throttle, digital dash, CRF230F titanium exaust, NGK spark plug, o-ring chain, old/locking style gas tank, 17t front sprocket, 39t rear sprocket, OKSTNO mirrors, LED headlight, GUB phone mount, ATLAS throttle lock, more to come. Lifan KPR 200 - Stock. For now... |
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05-07-2022, 04:59 PM | #4 | |
Join Date: Sep 2021
Location: De Soto, MO
Posts: 1,976
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Quote:
Edit: I went back to your previous posts and saw that the carb issue was with a Hawk.
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2021 Lifan Xpect--sold 2022 Lifan KPX 1972 Honda CT90--The Carrot 1969 Honda CT90--The Tomahto Cheesy is the WDK (workplace drama king). Now retired. Nope, back in the saddle. Nope, finally retired. Climate: The Movie https://www.youtube.com/watch?v=A24fWmNA6lM How our government really works https://www.youtube.com/watch?v=QjadCd0VRBw Question all authority.....think for yourself |
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05-08-2022, 03:39 PM | #6 |
Join Date: Sep 2019
Posts: 14
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No CEL. Correct, I only experience the issue when its hot outside. It happens immediately. I just checked the coolant, it's full.
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2019 Hawk 250 - PWK carb, NIBBI throttle cable, Bitwell whisky throttle, digital dash, CRF230F titanium exaust, NGK spark plug, o-ring chain, old/locking style gas tank, 17t front sprocket, 39t rear sprocket, OKSTNO mirrors, LED headlight, GUB phone mount, ATLAS throttle lock, more to come. Lifan KPR 200 - Stock. For now... |
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05-09-2022, 12:18 AM | #7 |
Join Date: Aug 2020
Location: Savannah, Ga
Posts: 760
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Where does your ECU sit? Is it close to the fairing? If it is, is the sun shining directly on that side?
I'm trying to remember if these engines have air intake temp sensors or not. I have a feeling that could be an issue. |
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05-10-2022, 12:20 PM | #8 | |
Join Date: Sep 2019
Posts: 14
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Quote:
Edit: looking at the schematics for the bike, I do see an IAT sensor. I don't know where it's physically located, but it does seem that it's present.
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2019 Hawk 250 - PWK carb, NIBBI throttle cable, Bitwell whisky throttle, digital dash, CRF230F titanium exaust, NGK spark plug, o-ring chain, old/locking style gas tank, 17t front sprocket, 39t rear sprocket, OKSTNO mirrors, LED headlight, GUB phone mount, ATLAS throttle lock, more to come. Lifan KPR 200 - Stock. For now... Last edited by swolff; 05-10-2022 at 01:13 PM. |
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05-10-2022, 01:39 PM | #9 |
Join Date: Sep 2021
Location: De Soto, MO
Posts: 1,976
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Before you start worrying about ECU location and IAT sensors, check your valves. Always do the simple and cheap fixes first. No one should have to relocate their ECU.
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2021 Lifan Xpect--sold 2022 Lifan KPX 1972 Honda CT90--The Carrot 1969 Honda CT90--The Tomahto Cheesy is the WDK (workplace drama king). Now retired. Nope, back in the saddle. Nope, finally retired. Climate: The Movie https://www.youtube.com/watch?v=A24fWmNA6lM How our government really works https://www.youtube.com/watch?v=QjadCd0VRBw Question all authority.....think for yourself |
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05-10-2022, 02:03 PM | #10 |
Join Date: May 2021
Posts: 357
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Is there a stuck thermostat possibly, just thinking out loud?
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05-28-2022, 09:47 PM | #12 | |
Join Date: Sep 2019
Posts: 14
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Quote:
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2019 Hawk 250 - PWK carb, NIBBI throttle cable, Bitwell whisky throttle, digital dash, CRF230F titanium exaust, NGK spark plug, o-ring chain, old/locking style gas tank, 17t front sprocket, 39t rear sprocket, OKSTNO mirrors, LED headlight, GUB phone mount, ATLAS throttle lock, more to come. Lifan KPR 200 - Stock. For now... Last edited by swolff; 05-29-2022 at 01:05 PM. |
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06-16-2022, 03:59 PM | #13 |
Join Date: Jun 2022
Posts: 21
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Can you please explain how or why ?
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06-17-2022, 01:34 PM | #14 |
Join Date: Feb 2018
Location: RDU, NC
Posts: 683
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Because the valve is slamming against the seat over and over and over again, at double the engine rpm. So at 7000rpm your valves are opening and closing 14,000 times in one minute. Multiply that by thousands of miles. Bits of valve wear off, bits of valve seat wear off. The wear means the valve now sits higher in the head, which reduces the clearance between follower and cam.
Valves CAN go the other way, and loosen up with time. That is usually due to poor metallurgy in either the camshaft or the rocker/follower. Or poor oiling. Or both. The cam is wearing away faster than the valves can recede into the head. That was a big problem with 1980s Hondas, but it's largely solved now. Charles. |
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06-23-2022, 10:49 PM | #15 |
Join Date: Jun 2022
Posts: 21
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Thanks for the explanation. I knew part 2, but part 1 is new to me.
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Tags |
kpr 200, lifan |
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