embee 7,288 Posted June 22, 2019 Share Posted June 22, 2019 (edited) No knock sensing on the NC. …………….. and knock (pinking/pinging) is a totally different phenomenon to pre-ignition...………………………….. Edited June 22, 2019 by embee 1 1 Link to post
DMB 1,341 Posted June 22, 2019 Share Posted June 22, 2019 4 hours ago, Tex said: Well, if I am brutally honest I don’t know for sure that it does. But with it’s ‘half a Jazz’ heritage I would be amazed if it didn’t.. To me too. But the NC is a (disappointingly) noisy old lump, so it could be anything. Tex - You might be on the right track. Given its 'half a Jazz' heritage perhaps the problem is that there's some old Jazzer stuck inside bike's frunk, pushing out some crazy bebop time signature, perhaps a four beat pulse on his ride cymbal. But I could be mistaken. 2 Link to post
sid 227 Posted June 22, 2019 Share Posted June 22, 2019 5 hours ago, Tex said: Well, if I am brutally honest I don’t know for sure that it does. But with it’s ‘half a Jazz’ heritage I would be amazed if it didn’t.. To me too. But the NC is a (disappointingly) noisy old lump, so it could be anything. Can't hear mine anymore with the Black Widow minus db killer........... 1 Link to post
SteveThackery 3,090 Posted June 22, 2019 Share Posted June 22, 2019 4 hours ago, embee said: No knock sensing on the NC. …………….. and knock (pinking/pinging) is a totally different phenomenon to pre-ignition...………………………….. I agree - the terms lead to confusion. Really we should be talking about pre-ignition and detonation. "Knocking", "pinking", "pinging", etc, are imprecise descriptions of the sounds and are best avoided. Link to post
ncx19 29 Posted July 13, 2019 Share Posted July 13, 2019 first tank of gas was 87 octane. I noticed what I believe to be the same sound. Lower speed, lower rpms, steady tapping sound with rpm until it revs higher. road speeds there is too much wind noise I suspect, because I only noticed around town. next tank of gas was Chevron Ultra 97 octane havent heard it since, I suspect it was spark knock. Link to post
embee 7,288 Posted July 13, 2019 Share Posted July 13, 2019 1 hour ago, ncx19 said: first tank of gas was 87 octane. I noticed what I believe to be the same sound. Lower speed, lower rpms, steady tapping sound with rpm until it revs higher. road speeds there is too much wind noise I suspect, because I only noticed around town. next tank of gas was Chevron Ultra 97 octane havent heard it since, I suspect it was spark knock. I assume you're in the USA. For info for those of us here in the UK, US terminology is usually for (RON+MON)/2 , and MON is typically 7 or 8 numbers lower than RON, thus 87 (R+M)/2 equates to 91RON typically. Note that the NC is calibrated for 91RON minimum, so that would be the lowest spec acceptable. We don't get anything lower than 95RON here in the UK. 1 Link to post
Guest MartinF999 Posted August 3, 2019 Share Posted August 3, 2019 My NC750X DCT developed a rattly noise that may or may not be like this at about 9000 miles, and turned out to be the chain that was not moving freely as I hadn’t lubricated it enough. Honda sorted it out, and now I’m oiling it more often. It wasn’t the engine, but was noticeable when applying some power to pull away. Worth checking... Link to post
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