OK, and now I see that the mention of the fan in the post does not appear unless I click on the "see more" note. And I am sure that the start is a kick start, not a cranking motor that would require a battery.
So now a question about why the need to delay the fan?? Does providing the fan power make it harder to start?? Or does it tend to cause some other issues??
My observation is that competition motorcycles, especially trials racers, tend to not include any parts not absolutely needed. I think that includes lights and horns, but I am not sure about that. So I am wondering if either the fan has developed some sort of problem, or if the alternator output capability has deteriorated.
In short, it may be that providing a delay of the fan starting is not repairing the failure that had developed.
OR it may be that adding some other function has increased the load on the electrical supply.

Thank you Bill, apologies I didn't realise my comment about the fan was hidden.

Yes it's much harder to start if the fan thermostat is on and I'm trying to living the fan over with the kick start.

Yes your right the relay is masking the starting issue but it's the only thing that currently helps me unless I start to pull the alternator apart....

Thanks for the advice

 

And I realize that a manual switch may be neglected and be left off, with unfortunate results. Possibly the fan just needs some oil? And maybe some other scheme to do a very temporary switch off? How about a switch opened when the kick start pedal is moved off it's resting place?? Some folks do not return that pedal to the resting point right away.
That scheme would be totally automatic and not depend on the system voltage at all.