Hi there
Sorry to hear your VF is giving you some dramas. Can often be difficult to pin down a problem like this. There are some
things that you can do initially to eliminate things that may be going wrong
To remove the ignition system from the
equation, First I would check to see that it is getting good bright blue spark when hot. It may be a coil breaking down when hot from running, it may be degradation in electrical connections in the wiring to the ignition. Good strong spark eliminates all of these things.
It may be a
carburation problem, float levels incorrect,
vacuum petcock not operating correctly, gummed up jets or metering passageways in the
carbies. Put some fuel system cleaner additive in the tank and run 100k on it to see if that helps. I use
Nulon, if you cant get that, talk to the guys at your local
autoparts store, they will have a decent brand to sell you. Check the plugs when it is hot(and not starting) for spark, and to and see if they get wet with fuel. This would point to a float level/flooding problem, or just poor metering by
carbies.
If you have a compression tester, is probably worth checking the compression when hot. A tired engine with low compression
willl present problems starting.
The other thing to look into, and I cannot tell from your initial question if the starter itself is not cranking(at all or just not enough ) to start when hot. Perhaps you can clarify that for me.
Let me know of the things you have looked at or tried other than the charging system.
regards
robotek