Member Contributer Skipper Posted July 16, 2022 Member Contributer Share Posted July 16, 2022 I own a restoration project 1988 Australian delivered from factory VFR 750F c/w RC24U engine. There is a number tattooed on the lower crankcase on the left had side near to the oil filter. It reads: KN2650. It appears to be electronically applied with a series of dots that have penetrated the original engine paint, and has not been applied in the more traditional letter/ number punch method, nor is it done with a center punch. Does anyone know what it is all about, my only thoughts were that it may have been a previous owners attempt at personal identification as I can find no suggestions in any official markings done by Honda? Link to comment Share on other sites More sharing options...
Member Contributer Skipper Posted July 19, 2022 Author Member Contributer Share Posted July 19, 2022 Here is a tattoo on my second VFR 750, also of similar vintage -I had not noticed previously It would seem there is a purpose to these numbers though I have no idea what it is? Perhaps something applied by the Australian importer? Link to comment Share on other sites More sharing options...
Member Contributer Captain 80s Posted July 19, 2022 Member Contributer Share Posted July 19, 2022 Strange. Really surprised 2 bikes have it. Same format, it is not random now. Link to comment Share on other sites More sharing options...
Member Contributer Tirso Posted July 19, 2022 Member Contributer Share Posted July 19, 2022 On 7/16/2022 at 3:52 PM, Skipper said: I own a restoration project 1988 Australian delivered from factory VFR 750F c/w RC24U engine. There is a number tattooed on the lower crankcase on the left had side near to the oil filter. It reads: KN2650. It appears to be electronically applied with a series of dots that have penetrated the original engine paint, and has not been applied in the more traditional letter/ number punch method, nor is it done with a center punch. Does anyone know what it is all about, my only thoughts were that it may have been a previous owners attempt at personal identification as I can find no suggestions in any official markings done by Honda? the marking on my '99, rear cylinder you'll find a similar marking (different number) on your front cylinder your camshaft holder will have corresponding number that way you don't mix them at least that's what I used them for when I checked valve clearance Link to comment Share on other sites More sharing options...
Member Contributer Captain 80s Posted July 19, 2022 Member Contributer Share Posted July 19, 2022 14 minutes ago, Tirso said: the marking on my '99, rear cylinder you'll find a similar marking (different number) on your front cylinder your camshaft holder will have corresponding number that way you don't mix them at least that's what I used them for when I checked valve clearance The DOT matrix style of his markings is what make them very un-Honda to me. Yours look traditionally stamped (like Honda does), unless I couldn't zoom close enough to tell. I've had 4 of my RC24/26 engines out for cleaning and painting and I have never come across markings like his. Link to comment Share on other sites More sharing options...
Member Contributer Tirso Posted July 19, 2022 Member Contributer Share Posted July 19, 2022 1 hour ago, Captain 80s said: The DOT matrix style of his markings is what make them very un-Honda to me. Yours look traditionally stamped (like Honda does), unless I couldn't zoom close enough to tell. I've had 4 of my RC24/26 engines out for cleaning and painting and I have never come across markings like his. They're DOT matrix style. I'm sure it means something: manufacturer, date, assembly line, ??. But they match the cam holders. Found this 6th Gen on eBay. My 5Th Gen is similar Link to comment Share on other sites More sharing options...
Member Contributer Captain 80s Posted July 19, 2022 Member Contributer Share Posted July 19, 2022 10 minutes ago, Tirso said: They're DOT matrix style. I'm sure it means something: manufacturer, date, assembly line, ??. But they match the cam holders. Found this 6th Gen on eBay. My 5Th Gen is similar Ok, thanks for the clarification. Gonna look closer at my engines that are out of frames. Just never noticed them before. Link to comment Share on other sites More sharing options...
Member Contributer Dutchy Posted July 19, 2022 Member Contributer Share Posted July 19, 2022 55 minutes ago, Tirso said: But they match the cam holders. Makes sense to keep them parts together after line boring. Link to comment Share on other sites More sharing options...
Member Contributer Skipper Posted July 24, 2022 Author Member Contributer Share Posted July 24, 2022 Thanks for the feedback, but no, the dot matrix style is not applied by the same gadget I don't feel, somewhat less clean in application, and larger sized I also own a '86 Japanese domestic market VFR 750 that subsequently ended up in Australia - and it does not have this numbering on the crankcase Seems it is to remain one of life's mysteries, I don't even know if they appear on bikes sold to other parts of the world? Link to comment Share on other sites More sharing options...
Member Contributer Tirso Posted July 25, 2022 Member Contributer Share Posted July 25, 2022 let's find out, open it up:-) Link to comment Share on other sites More sharing options...
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