Hi guys - hope everyone had a good week.
So the good news is I got the 1980 CB750F (speedometer indicates 31,000 miles +/-) back on the road after rebuilding the carbs and brakes and absolutely love it. Electrical system came up and it rides surprisingly well despite still needing everything. The bad news is that I'm skeptical that she is going to stay on the road for long.
When I changed the oil prior to firing her up what came out when I drained the oil was super thick, which set off alarm bells. The oil, while dark in color, was free of any debris or metal. When I started her at low RPM, like idle to 2,000 RPM, when cold there is what I can only describe as a knocking sound that goes away once over 2,000 RPM. Once warmed the knocking is usually gone even at idle.
Bike runs very smoothly and pulls strong.
I have not done a valve adjustment yet, I have not tightened the flywheel bolts.
I have my suspicions but don't want to lead the conversation in any particular direction - what do you all think is going on here.
Thanks!
So the good news is I got the 1980 CB750F (speedometer indicates 31,000 miles +/-) back on the road after rebuilding the carbs and brakes and absolutely love it. Electrical system came up and it rides surprisingly well despite still needing everything. The bad news is that I'm skeptical that she is going to stay on the road for long.
When I changed the oil prior to firing her up what came out when I drained the oil was super thick, which set off alarm bells. The oil, while dark in color, was free of any debris or metal. When I started her at low RPM, like idle to 2,000 RPM, when cold there is what I can only describe as a knocking sound that goes away once over 2,000 RPM. Once warmed the knocking is usually gone even at idle.
Bike runs very smoothly and pulls strong.
I have not done a valve adjustment yet, I have not tightened the flywheel bolts.
I have my suspicions but don't want to lead the conversation in any particular direction - what do you all think is going on here.
Thanks!