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Post by rdjames on May 15, 2023 14:25:51 GMT 1
Can any one help with the colour of my plugs, did a plug chop at top speed. Its a 31k just had the barrels blue printed and set up with Rob at Spa motorcycles std carbs and exhaust and modified airbox just put 250 main jets in. thanks David www.flickr.com/gp/162200225@N05/23Qw0292v4 |
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Post by Robbieben on May 15, 2023 15:03:39 GMT 1
Hard to say without the threaded portion being cut away exposing the ceramic inner electrode cover, if its running well you'll see a brown ring around the electrode ceramic cover. Looking at the plugs as they are and not having run for long I'd say its possibly running a bit lean.
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crigar
Weekend rider
Posts: 88
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Post by crigar on May 15, 2023 19:13:09 GMT 1
I find that the ceramic is very white, so very poor.
Are the spark plugs new ?
Was the carburetion stop done with an engine at operating temperature ?
Having driven at least 10 km ?
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Post by reedpete on May 15, 2023 21:38:48 GMT 1
Can any one help with the colour of my plugs, did a plug chop at top speed. Its a 31k just had the barrels blue printed and set up with Rob at Spa motorcycles std carbs and exhaust and modified airbox just put 250 main jets in. thanks David www.flickr.com/gp/162200225@N05/23Qw0292v4Way too clean for my liking… road bike best being safe rich IMO. how many miles had those plugs done ? |
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Post by rdjames on May 15, 2023 22:42:47 GMT 1
6 miles in total
3 with 240 jets then 3 with 250s jets
plus are NGK BR8 ECS
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Post by rdjames on May 15, 2023 22:46:33 GMT 1
I find that the ceramic is very white, so very poor. Are the spark plugs new ? Was the carburetion stop done with an engine at operating temperature ? Having driven at least 10 km ? Hi new plus and done about 3 miles to worm up then a very good blast for 0.5 mile, kill engine then took photo. |
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Post by midlifecrisisrd on May 16, 2023 7:36:26 GMT 1
What airbox mods?
If you have removed the snorkels that's 2 sizes up then the engine work
Steve
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Post by vectisitch on May 17, 2023 12:19:47 GMT 1
I would say with airbox mods you need at least 260 main. But we are just guessing without more info
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