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Post by davidchef on Aug 12, 2024 19:50:51 GMT
Has anyone seen this problem, I set my spark plug on offside cylinder to .7 and the bike rides nice. After a brief run out 10 miles or so I check the gap and it is now .5. If I leave it and ride out I get a misfire from 4000 revs. Check and adjust gap and rides nice with no misfire. Plugs are NGK DR8ES. I wonder if the engine has had a head skim?
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Post by alfie on Aug 13, 2024 17:45:38 GMT
Has anyone seen this problem, I set my spark plug on offside cylinder to .7 and the bike rides nice. After a brief run out 10 miles or so I check the gap and it is now .5. If I leave it and ride out I get a misfire from 4000 revs. Check and adjust gap and rides nice with no misfire. Plugs are NGK DR8ES. I wonder if the engine has had a head skim? if it has been skimmed, it would be the same for both sides, check that the nearside plug hasn't got more than one sealing washer |
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Post by davidchef on Aug 13, 2024 19:06:51 GMT
That's true, don't think it has an extra washer though as I have swooped them. I will check.
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ian
Member Of The Year 2019 
Isle of Man
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Post by ian on Aug 13, 2024 19:25:58 GMT
I had a similar problem on my 250NB. It could rev way past the red line & I thought that was what I'd done, causing one of the pistons to touch a plug. It happened again though, and this time I was sure I hadn't overdone the revs. Don't know what the problem was, but I put an extra washer under the plug & made sure I fitted new washers whenever the plug was removed, and had no more problems with it
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