Hi Guys. I bought a CB 750 k1 but I know practically nothing about my exemplar so I did let's say a sort of gamble.
The only thing I know is that engine plate and frame plate are very near so the engine is the original one and that in the last 15 years has been stopped without starting up in a repaired garage.
Motorbike has been given to a mechanic that is quite known for his experience on old motorbikes especially Hondas.
Now first impressions from mechanic. Motorbike is very difficoult to start in cold conditions. It is needed to blow a flamable spray into the inlet duct to help starting. Once the engine is started, it restarts easy in warm & hot conditions but on the road is weak and slow to raise of rpms.
The compression test has shown that all cylinders are low in compression and well under the minimum acceptable limits.
The mechanic adviced me that he never saw such results in this kind of engine and is better to make some hundreds km to see if this is due to long time of inactivity (clearances to adjust themselves etc). In few words, prior to open the engine, run some time and at high RPMS to see if the engine come back from these unusual results to a better condition.
See here compression test results (units I don't know what are, I think barg)
Thanks in advance for your advices.