Set up an upper cyl lube kit as used on gas engines, you can dial back the drip feed to only a min feed. Use Shell Optimax, this is by far the best blend to use, but be warned that you should change the fuel filter at least 2 times during the first 2-3 tank fulls. Optimax
WILL clean out all the muck in your fuel tank and fuel lines, and carby problems will visit you when you least expect it. You may have to address any tune problems, with different heat range spark plugs & timing settings, depending on the core condition of your engine. Check the ignition leads, or better still just fit new leads if they are over 3 years old, very important to check distributor cap, rotor and coil output as well, if all this is a little bit daunting, get your mechanic on the job, and you will find a marked improvement in power & the fuel economy you will gain will pay for the job in no time.
Good luck,
Mark. (myoldlandy)
