06-30-2024, 11:57 AM | #1 |
Join Date: Feb 2021
Posts: 997
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Should I re gap spark plug for stock motor?
As most know, I had a cam follower fail on my fairly hot CG Hawk motor, and it took the timing gears out in the process. I quickly slapped a stock motor on it , from a parts bike I bought, which was showing around 700 miles, but probably abusive miles. It runs good for internally stock, and I am running a VM26 with 110/25 jetting . I had installed one of the Nibbi Yellow coils, not long ago, and gapped my plug to .9 mm. I used this same plug for the current stock motor. Should I reduce the gap to about.7mm, or leave it at .9mm ? Thanks
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06-30-2024, 04:23 PM | #3 |
Join Date: Jan 2007
Location: Northern Vermont, USA
Posts: 1,271
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It isn't going to make a difference either way.
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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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06-30-2024, 07:09 PM | #4 |
Join Date: Nov 2019
Location: KY
Posts: 277
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Anyone that would worry about +- .2mm spark plug gap has never watched ItchyBoots being passed by a Chinese motorbike, axle deep in the mud of a west African dirt track, while being chased by elephants and pigmies.
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%90 of the Chinese motorbikes ever made are still on the road. The other %10 made it back home. |
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06-30-2024, 10:17 PM | #5 |
Join Date: Dec 2020
Location: Dayton Pa.
Posts: 945
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so true ,should not ride a at all
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06-30-2024, 11:33 PM | #6 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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You can leave the gap alone. I ran the Iridium plug with it's .9mm (.036") gap on my first Hawk for 4400 miles, and that bike only had an exhaust and the same carb. The fine point iridium plug creates a more focused arc point, so they are much more likely to jump a wider gap and with a consistently hotter spark.
Now, if you can hear it missing a hit or two, especially at idle, then you can definitely shrink the gap a bit. Running a .028" gap (.7mm) is perfectly acceptable. That is still wider than the factory plug gap (.6mm). You can also compromise and split the difference between the stock gap and the iridium .9mm gap and run a .030" gap, which is between a .7mm(.028") and .8mm(.032") gap.
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Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124 |
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07-01-2024, 09:56 AM | #7 | |
Join Date: Feb 2021
Posts: 997
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Quote:
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07-01-2024, 08:51 PM | #8 |
Join Date: Aug 2013
Posts: 326
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Smaller gap only if your compression ratio is 9.5:1 to 10:1 (water cooled).
For air cooled, especially if you are running close to stoic ratios, the stock gap will do. |
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