Join Date: 04-16-2019
Location: Worcester, England
Mentioned: 6 Post(s)
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Re: 1 intake valve not opening
Not sure if it's photographic distortion, but the second valve actually looks bent (at the base) and also looks unseated at the left edge.
Further, the number one inlet ports show a lot of discolouration which appears to be carbon blow back from the exhaust valves being open. Whislt there is usually some overlap with valve openings, the discolouration really suggests a valve problem. I now wonder if the camshaft has actually snapped, or the buckets/shims out of place.
Perhaps wait for further opinions, but if the bike were mine, I would be doing an immediate valve cover and possibly top end removal to see first-hand. No matter what, there is some serious damage in there (in my opinion).
2018 CBR1000RR SP2 / 2004 CBR1000RR / 2003 CBR954RR / 2001 CBR929RR (Erion Racing Edition)
1985 Honda VF1000R / 1985 Honda NS400R
2007 MV F4 1000R / 2020 Daytona 765 Moto 2 Replica (on order)