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Thanks Speedrattle, the timing cover is my tomorrow job. I’ve rebuilt a couple of 650/750 twins recently but this is a mystery to me. At least I have the special tools for the job.I don’t know what cam it is but it ran fine for 50 miles, during those miles the power didn’t seem exceptional. I can’t ask the builder because he passed away just before fitting battery and ignition timing it. I almost wondered if he’d straightened out some old rods but why save £30 after all this work? Rods when straightened measure 150.7mm ….. I have a rod from a previous Bonnie (650cc?) that is 10mm longer, btw.When I checked the tappets last week (.008/.006) no sign of binding or piston clash whilst rotating crank. I was checking head torque at the time so I also checked tappet clearance. Nothing to concern me then.It’s a mystery…… which I don’t like. I can only guess at valves sticking shut. Whilst looking at tappets I could see edge of the inlet valve opening up through the plug holes and there didn’t seem any close proximity to the piston then.If worse comes to worse I’ll have to remove head and see if valve stems seem tight in the guides.
Thanks Speedrattle, the timing cover is my tomorrow job. I’ve rebuilt a couple of 650/750 twins recently but this is a mystery to me. At least I have the special tools for the job.
I don’t know what cam it is but it ran fine for 50 miles, during those miles the power didn’t seem exceptional. I can’t ask the builder because he passed away just before fitting battery and ignition timing it. I almost wondered if he’d straightened out some old rods but why save £30 after all this work? Rods when straightened measure 150.7mm ….. I have a rod from a previous Bonnie (650cc?) that is 10mm longer, btw.
When I checked the tappets last week (.008/.006) no sign of binding or piston clash whilst rotating crank. I was checking head torque at the time so I also checked tappet clearance. Nothing to concern me then.
It’s a mystery…… which I don’t like. I can only guess at valves sticking shut. Whilst looking at tappets I could see edge of the inlet valve opening up through the plug holes and there didn’t seem any close proximity to the piston then.
If worse comes to worse I’ll have to remove head and see if valve stems seem tight in the guides.
