Good day all
New owner of an ‘80 650C which my son and I are rebuilding. It started out with us taking off the carbs to get it going and now the top end is off and we’re contemplating doing the bottom end
Apologies if I’ve missed a previous thread. I’m wondering the connecting rod bearing cap bolts can be re-used or if they are stretch to torque?
I have to add a massive thank you to all the moderators/ members who keep this site alive! You guys are invaluable to novices like me and I’ve benefitted hugely from the advice and wisdom on this forum
Connecting Rod bolts
Re: Connecting Rod bolts
Welcome, you won't find much activity erre, but there's a lot of good info.
I found this on SOHCforum.
If you get into the bottom, check the starter clutch, I had to replace mine (cheap on ebay) there is a tutorial on here.
I found this on SOHCforum.
If you get into the bottom, check the starter clutch, I had to replace mine (cheap on ebay) there is a tutorial on here.
Re: Connecting Rod bolts
Yoh kerryb that was quick!
Ok so no new conrod bolts unless damaged. That will help the bank balance
And thanks for the heads up about the starter clutch. Looking at previous threads I think that means new springs/rollers/caps (thank you Mr Volker)?
I have a little lateral movement of the small ends of the conrods but minimal up/down movement. Can I make any judgement about bearings from this before I open the crankcase?
Thanks again for your advice
Ok so no new conrod bolts unless damaged. That will help the bank balance
And thanks for the heads up about the starter clutch. Looking at previous threads I think that means new springs/rollers/caps (thank you Mr Volker)?
I have a little lateral movement of the small ends of the conrods but minimal up/down movement. Can I make any judgement about bearings from this before I open the crankcase?
Thanks again for your advice
Re: Connecting Rod bolts
Welcome here!
Thanks for feedback! But unfortunately it looks like there is a problem for the future.
Usually this solves the problem. In very rare cases the starter clutch housing may be already smashed or the surface of the cam could have marks.
The tolerances for up/down movement in the connection rod bearings are typically much closer than for lateral movement so basically your finding sounds reasonable. You can find the specs and service limit on page 12-1 ("crankshaft") of the manual linked in my signature.
Appie wrote:I have to add a massive thank you to all the moderators/ members who keep this site alive! You guys are invaluable to novices like me and I’ve benefitted hugely from the advice and wisdom on this forum
Thanks for feedback! But unfortunately it looks like there is a problem for the future.
Appie wrote:And thanks for the heads up about the starter clutch. Looking at previous threads I think that means new springs/rollers/caps (thank you Mr Volker)?
Usually this solves the problem. In very rare cases the starter clutch housing may be already smashed or the surface of the cam could have marks.
The tolerances for up/down movement in the connection rod bearings are typically much closer than for lateral movement so basically your finding sounds reasonable. You can find the specs and service limit on page 12-1 ("crankshaft") of the manual linked in my signature.
Cosky's great (free) online manual: http://cosky0.tripod.com
forum links to common technical issues
If you really like this site and you would not like to see it vanish soon, have a look there: Urgent: Future of HondaCB650.com Forum
forum links to common technical issues
If you really like this site and you would not like to see it vanish soon, have a look there: Urgent: Future of HondaCB650.com Forum
Re: Connecting Rod bolts
One further comment on the starter clutch. Mine was damaged because the screws that hold it together came unscrewed! Scraping the screw heads against the next part while spining.
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