07-17-2024, 09:32 PM | #16 |
Join Date: Jul 2024
Location: Houston, TX
Posts: 40
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The exhaust glowing red would indicate a very lean mixture, or a restricted exhaust. If this bike has a catalytic converter in the exhaust, it could be partially blocked. Try disconnecting the exhaust from the engine and fire it up momentarily to see if it will take throttle. Don't run it for a long period with the pipe disconnected as it's possible to warp the exhaust valve.
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CC-John "I void warranties" 2024 Templar 250 X 2018 Nissan Frontier (work truck) 2006 Ford F-150 Crew cab (play truck) 1973 Century Resorter 16 (Floating Muscle Car) |
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07-18-2024, 02:31 AM | #17 |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,601
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My Templar is doing the same thing. I suspect pilot circuit lean issue. I need to pull the carb and take a look. HOT exhaust, and won't idle after warmed up.
I am sure it is a carb problem. I have a spare to swap in, so I will probably do that.
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-NOS 2020 KTM 250SX (2-stroke motocross) |
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07-18-2024, 04:49 PM | #18 | ||
Join Date: Feb 2020
Posts: 18
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Let me know how it goes. txpowersports is sending a carb and CDI but they haven't given me a tracking number yet |
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07-18-2024, 05:00 PM | #19 |
Join Date: Jul 2024
Location: Houston, TX
Posts: 40
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If that engine has an EGR system on it, a dirty EGR valve that won't close all the way can cause the symptoms you're having. That type of problem was pretty common on older carbureted cars and trucks.. Pulled and cleaned many an EGR valve back in the day to correct lean idle or stalling right off idle. The EGR valve is supposed to only open when the engine is at a high enough RPM to handle it without stalling or bogging.
Honestly, the best thing you could do is to just delete all that emission control crap to prevent ongoing problems as those parts age.
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CC-John "I void warranties" 2024 Templar 250 X 2018 Nissan Frontier (work truck) 2006 Ford F-150 Crew cab (play truck) 1973 Century Resorter 16 (Floating Muscle Car) |
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07-18-2024, 07:26 PM | #20 | |
Join Date: Feb 2020
Posts: 18
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I had deleted it at one point during this saga, but was concerned about causing buildup in the cats In my exhaust. Can safely say that is not causing it because It was off of my bike for about 3 and 1/2 days of this. That said, a future project of mine will be deleting the cats, deleting the EGR, and installing a nibbi carburetor. |
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07-29-2024, 04:53 PM | #21 |
Join Date: Feb 2020
Posts: 18
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Replace the carb and CDI as per txpowersports instructions. Same issue. Time to wait another 3weeks for them to ship more parts. I'm so effin fed up with this shit. It's goddamn brand new.
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07-30-2024, 05:35 AM | #22 | |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,601
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So I will check the valves now. Should have done it yesterday before putting the gas tank back on !
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-NOS 2020 KTM 250SX (2-stroke motocross) Last edited by Thumper; 07-30-2024 at 11:30 AM. |
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07-30-2024, 09:09 AM | #23 | |
Join Date: Feb 2020
Posts: 18
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07-30-2024, 11:34 AM | #24 |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,601
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Just checked exhaust valve. I need to verify I am on the intake TDC and check the intake valve.
I am starting to think I need to adjust the airscrew. It is on the airbox side, so should need to close that screw a little bit for more fuel. It misses at idle, won't keep idling if I lower the tower to get a normal idle rpm (1200 to 1400rpm). But the responsiveness off idle is excellent and midrange seems fine. This is a new PE28 I got as a back up. Stock exhaust and intact airbox, so this carb should match well. I rejetted (main 120 to 125 and pilot 40 to 42). I am at 1 1/2 turns out, will try 1-1/4 and see if it gets better.
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-NOS 2020 KTM 250SX (2-stroke motocross) |
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07-30-2024, 12:07 PM | #25 |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,601
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Those valve are really stable in the 172-FMM (Templar X). They were right where I left them 6 months ago.
But closing the airscrew a half turn smoothed it out. Nice idle, instant and strong response to throttle twist. I should have known it was a minor carb adjustment needed.
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-NOS 2020 KTM 250SX (2-stroke motocross) |
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07-30-2024, 09:11 PM | #26 | |
Join Date: Feb 2020
Posts: 18
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