Starting a sleepy Onan Microlite 4000

Using the "Prime" function for gasoline-fueled ONAN genny's (as Phil noted) is a very good idea, and something many of us didn't know was available till recently. I prime ours till I hear the pump stop its tapping sound. Then I attempt a start. It sometimes actually does start. If not, I repeat the priming and listening, the do a second attempt. It always starts then.
OP - Fully closing the choke is a good idea and I've done it in the past. I do NOT think the Microlite will cause this possible hazard, but... Be sure it's the Choke and not the Throttle. The older ONAN's would go right to 160-volts-plus if you tweaked the throttle. The one that did that with me had no electronics, just a mechanical governor. I think Microlite won't allow that much voltage. I'm just not sure and I just don't feel lucky.

I have a Onan 4000 Microlite, but it runs on propane.
This rig sat for a year with engine only being started every
week or so, but never started the Onan.
Now it just has a high clicking noise when I attempt to start
it.
Any clues?
Thanks,

I've also discovered - using the Onan remote start rocker switch on the panel inside the coach - that holding the Onan start rocker switch in the position opposite from "Start" for a few seconds runs just the Onan fuel pump so as to fill/prime the Onan gas line and carb float fully. Then hold the Onan start rocker in it's Start position for a fast start in all kinds of conditions.

I didn't discover this dual action of the Onan's remote start rocker switch until owning our motorhome for quite some time. The rocker switch is labeled as "Start" for it's engine starting position, but is not labeled for it's fuel pumping/priming position. I've never had to go outside and use the Onan's local controls under the cover. I just have used the dual action rocker switch for quick starting over the last 9 years.

AHA! So it IS a choke adjustment issue. I suspected as much. I've owned two of these gens; the current one was brand new. Both cold start like crud. I figured Onan had to lean out the jetting for emissions reasons, and maybe the choke too? I don't know, but one of these days I'll print the choke adjustment out and richen the choke setting. (I downloaded a service manual from somewhere or other.)

Thanks for the tip.

Yep, we were shown the same tip in a PDI.