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04-15-2024, 12:52 PM | #1 |
Join Date: Apr 2024
Posts: 5
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2021 EGL A17 NC250/300 Coolant in oil.
I recently purchased a very clean low hour EGL A17 300 with the Zongshen NC engine. While doing my typical new to me bike maintenance I found coolant in the oil. The previous owner told me that dealer had changed the oil a couple of months ago and bike has less than an hour ride time since. I have searched for information and cannot find anyone else mentioning this issue. I am going forward with water pump shaft and seal replacement and hoping that this resolves the issue but was also looking for guidance on other possibilities while I am tearing into it. Bike did not white smoke or run poorly. Thanks
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2012 Yamaha WR450f 2021 EGL A17 300 |
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04-15-2024, 01:25 PM | #3 |
Join Date: Apr 2024
Posts: 5
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I have not, but I certainly can, however the bike starts and runs perfectly, and I see no evidence of it burning coolant.
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2012 Yamaha WR450f 2021 EGL A17 300 |
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04-18-2024, 09:30 AM | #5 |
Join Date: Apr 2024
Posts: 5
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Update: Every NC250 parts breakdown I have found shows a simple single lip oil seal and a similar water seal. Mine has a mechanical seal like the NC450. The seal is in several pieces. I am not sure where to go for parts. Is this an NC450 seal? Is it an updated NC250/300 design? Perhaps it was a factory screw up and the NC450 seal was used by mistake? I am having a hard time finding a reliable source.
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2012 Yamaha WR450f 2021 EGL A17 300 |
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04-19-2024, 11:49 AM | #6 | |
Join Date: Mar 2010
Location: Volcano, Ca
Posts: 7,112
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Quote:
It's almost sounding like some ham-fisted mutant young kid did the service at the dealership and maybe didn't service it correctly??????
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04-18-2024, 08:08 PM | #7 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Are you 100% sure it's coolant and not just condensation?
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05-30-2024, 03:09 PM | #8 |
Join Date: Apr 2024
Posts: 5
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Update. Replaced water pump mechanical seal and problem persists. Trying to resist the urge to put some K-Seal in it, but head and base gasket on order. Just an FYI for anyone who might order a new pump shaft, Install it in exactly as you found it. My replacement shaft had additional washers and snap rings that had to be removed to make a proper seal. (edit) Ended up changing pump shaft back to original. They are different between NC 250 with compression seals vs. Mechanical seal like NC450.
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2012 Yamaha WR450f 2021 EGL A17 300 Last edited by Hugh Jass; 05-31-2024 at 10:00 AM. |
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05-30-2024, 06:37 PM | #9 | |
Join Date: Jan 2007
Location: Northern Vermont, USA
Posts: 1,271
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First Chinabike: 2006 Roketa RSX200E Current Chinabikes: 2023 Titan DLX & 2022 Lifan KP Mini w/ 210cc BRT kit, 22 RWHP! |
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05-30-2024, 03:43 PM | #10 |
Join Date: May 2021
Posts: 355
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I assume you’re not getting bubbles in the coolant? Why I ask is it could be from a pinhole leak in the water jacket after all where was it built. If this was the case a sealant of some sort would be the only best bet for temporary or perhaps longer relief. Just thinking out load…
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05-31-2024, 10:04 AM | #11 | |
Join Date: Apr 2024
Posts: 5
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Quote:
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2012 Yamaha WR450f 2021 EGL A17 300 |
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05-30-2024, 10:50 PM | #12 |
Join Date: Dec 2020
Location: Dayton Pa.
Posts: 941
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k seal never worked for me.
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