SOHC.co.uk Forums > CB750
Con Rod bolts
UKROBK7:
These bolts have been tightened once in manufacture and once by me for plastiguaging the bearing clearances so I look forward to what Mark Paris has to say Seamus. The bolts for my early K7 engine are
Seamus:
I had a good read of the relevant parts of the book and great detail is covered with respect to the crank and rods, but there is no mention of replacing the bolts.
Apparently, the rods are well over specified for the loads that the engine will impose on them. I suspect that the bolts will be OK.
I do however suggest that you post this question on the US site as Mark does frequent it (Hondaman is his username)
Good luck
Seamus
Voxonda:
Please replace the rod bolts as they are stretched when fastened. They are intended to do that. The oem for K/series are no longer available but the stronger ones from the F2 are. You do not want to have a loosened rodbolt.
AshimotoK0:
I guess your bike will be like most of ours here and never used ' in anger', so personally, I would re-use them, if this is the case with you Rob. Bryan on here has a wealth of knowledge on SOHC engines so does ChrisR (both in the UK) - so interested to hear what they say too. I am just a novice really so I bow to their judgement ! Interested to know what dealers did. No mention in my Haynes manual about con-rod bolt or nut replacement on rebuild
No mention of bolt/nut replacement in original '69 Honda Genuine Service Manual or '77 750 Manual covering the later F models or '88 'Common Service manual" No mention in the Service Bulletins I have seen. However these are really useful info on the CB750 crank shells and con rods in these Service Bulletins which are a god reference.
http://data.sohc4.net/SB750/750_31.pdf
http://data.sohc4.net/SB750/750_14.pdf
Cheers - AshD
Voxonda:
Hey AshD,
Well mine has and still is used 'in anger'. And I still would strongly recommend to not re-use the bolts. Compared to the cost of a engine rebuild they virtually cost very little. The nuts are the expensive part and they can be re-used. A full set (bolts and nuts) for about 55.00 GBP. I feel it would be saving on the wrong part. But it is just my opinion.
these pic's, of me and my bike, taken last weekend at circuit of Croix en Ternois in Northern France.
Cheers, Rob
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