I bought a 2005 Honda CBF 600S, rode it for about a week, and then asked my mechanic to check if everything is OK, and to replace the clutch cable.
The mechanic also replaced all the fluids, including oil. I took the motorcycle back to my garage, and on the next morning, I started the bike on neutral, gave it some time (a minute or two) to warm up, pulled the clutch lever, shifted into first gear -- and the engine stopped. I then started the engine again, and this time there was no problem.
This situation occurred again and again.
Now, EVERY MORNING, after the warm up I turn the engine off, shift into first, give the bike a wobble while pulling the clutch, and after the clutch plates disengage, I start the engine again.
I asked my mechanic what might be the cause, but his only idea was that the previous owner might have used some gasoline additives, which are known to interfere with the oil's quality. But that doesn't make sense, the bike had no such problems prior to my visit to the mechanic's.
My first thought was that my mechanic might have replaced the oil with a lower-viscosity one, but both SAE 10W-40 and SAE 10W-30 are fine for Honda CBF 600.
- What might be the cause? I should add that, other than the problems in the morning, the clutch works fine.
- Is my wobbling the bike in first gear somehow foolish? I've heard that the cam chain tensioner may become mis-adjusted if the bike is pulled backwards while in gear, but I couldn't confirm that using google.