I have an HPI Super Nitro with a Picco .12 engine. I’m hoping someone on this forum can help me with the following:

A site to download a manual for this engine
The initial high and low speed needle settings
Proper flow plug for it

It currently has an O.S. A3 plug and from what I was able to find online (AMain) the A3, or now #6 hot plug, would be appropriate for .12 size engines; however, the AMain site also said O.S. plugs should not be used in most engines manufactured in Europe.

Any help anyone could provide would be greatly appreciated.

https://number1-hobby.com/products/o...-air-glow-plug

For a racing brand engine you need a 5 or 6 onroad plug from Picco or Novarossi (or even HPI), the A3 is much too hot and now named as a 6 is too confusing compared with normal plugs.

Forget the factory settings, they are not right but make the engine startable. If the engine starts it is wiser to learn how to tune, then you never need the the factory settings. And Picco does not list much of older engines but maybe you will find something at Trinity because in that period Trinity had a same engine from Picco,

Thank you very much for the information!

After a bit of adjusting the low speed needle I was able to get it started and idling well. Here is a clip of my first run after doing my adjustments. Thanks again!

It sounds like the engine is a little rich, but it's better to err on the side of too much fuel than too little. In particular, the P12 can handle a fairly lean LSN setting because there isn't much pinch between the piston and sleeve so there isn't much heat buildup from friction. Also, you can dial-up the shift point on your transmission significantly from where it is now; the P12 revs very easily and you're not saving the engine from any unnecessary stress by keeping the shift point low. I'm currently using an O'Donnell medium glowplug in my P12, but I've experimented with a hot glowplug in the past; as expected it idles more reliably and accelerates without bogging-down if it has been idling for a minute or two beforehand, but the hot glowplug burned-out after a few runs, whereas I've been running medium glowplugs in several engines for years without needing to replace any of them. The P12 is my only engine in the past several years that has actually burned-out a glowplug, so I guess I won't be going back to a hot glowplug in that engine. The P12 doesn't tolerate old glowplugs like my Taiwanese-made engines do, though; best to use only new or lightly-used glowplugs in the P12. Oh, and the shim stack can be lowered by 0.1mm (to 0.4-0.45mm) to get more torque with no ill effects.

That's all the advice I have at this point; I'm still getting my P12 tuned just-right.