Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Any markings that look like these
These are the two Service Bulletins you need ..they came originally from BryanJ..... Why Honda never ammended the main Shop Manual with this information beats me. My original '69 diecast crank had the Japanese chracaters stamped on the con-rods but yours are something different. (Attachment Link) (Attachment Link)
They are M8 X 1.25.Why are you trying to take them out ? Leave them alone or you will be looking for a engineering firm that has a spark eroder ( EDM machine ) to remove the broken bits. Some of these stud holes can not be heli-coiled as they are a oil way for oil to be feed to the head
It can be a very expensive hobby trying to remove these. Stud A is still available at about £15 each and there are 12 of those. Stud B has not been available for many years. Add in the cost of spark eroding at £25 a pop and you are looking at a shed load of money, just to replace something that with a good clean could be good to go
Quote from: Trigger on August 28, 2020, 07:15:53 PMIt can be a very expensive hobby trying to remove these. Stud A is still available at about £15 each and there are 12 of those. Stud B has not been available for many years. Add in the cost of spark eroding at £25 a pop and you are looking at a shed load of money, just to replace something that with a good clean could be good to go Thanks. Another question! I'm struggling to remove the front engine mount bolt. All the others came out no probs. It's just a straight through bolt right? Can't turn the head after heat and brute force. Don't want to get the big hammer out either just yet!Edit: nevermind. Bolt sheared off despite my heat cycling and gentle persuasion.... Thanks.Sent from my ONEPLUS A6013 using Tapatalk
Quote from: WestYorkshireBiker on August 29, 2020, 04:16:52 PMQuote from: Trigger on August 28, 2020, 07:15:53 PMIt can be a very expensive hobby trying to remove these. Stud A is still available at about £15 each and there are 12 of those. Stud B has not been available for many years. Add in the cost of spark eroding at £25 a pop and you are looking at a shed load of money, just to replace something that with a good clean could be good to go Thanks. Another question! I'm struggling to remove the front engine mount bolt. All the others came out no probs. It's just a straight through bolt right? Can't turn the head after heat and brute force. Don't want to get the big hammer out either just yet!Edit: nevermind. Bolt sheared off despite my heat cycling and gentle persuasion.... Thanks.Sent from my ONEPLUS A6013 using TapatalkSuccessful day. Finally got the K6 lump out. Onwards and upwards..Sent from my ONEPLUS A6013 using Tapatalk
Quote from: AshimotoK0 on August 13, 2020, 08:40:16 AMThese are the two Service Bulletins you need ..they came originally from BryanJ..... Why Honda never ammended the main Shop Manual with this information beats me. My original '69 diecast crank had the Japanese chracaters stamped on the con-rods but yours are something different. (Attachment Link) (Attachment Link) Hey. Been away a while I'm now back on the rebuild. So I'm still stuck with identifying the con rod bearings. I've got the journal ones worked out but for the con rods that came out if the engine I don't know how to find the shell colour as the rods are not marked as per the manuals. e.g the rods all have '2/29 (or 28)' marked on one side and nothing on the other side. All rods are marked 'S30F' and looking at the bullitins look like the 'new' type with the numbers on. Sent from my AC2003 using Tapatalk