First of all, a starter should not be used to start a Saito180. There is a very safe and reliable procedure to follow, which will start large four-stroke engine like this, and it goes like this:

1. Get engine wet: Glow off, throttle full, cover exhaust and turn through 2-4 compressions.
2. Assure no hydro lock: Glow off, Throttle full, turn through one compression.
3. Start engine: Glow on, Throttle at idle, grab either spinner tip or if no spinner, grab prop close to hub and bumb engine backwards up against compression. This is a step that's better learned by seeing, than by reading, so find somebody local who can show you.

By starting the engine this way, you never have any part of your body close to or in the blades path of movement, and there is never a great force applyed to engine, prop, or other part of plane/engine. I have often seen people fight with a starter unsccessfully, walked over and asked if I could try, and started the engine in less than 4 attempts, always to their great amazement.

Second, if needing a powerful electric starter, to start a Saito180, there is a very good chance, that something will break, whether it's something on the Saito or you. There is also a safe way of starting a large four-stroke with an electric starter, and the starter doesn't have to be extra powerful, but the procedure requires three hands, and that's why I always liked the manual starting procedure for these engines.

1. Glow on, throttle control and trim to closed position (like when you want to kill the engine), turn engine with starter and while turning, bring throttle trim to idle or just above, and engine will start.

When throttle is closed the engine has almost no dynamic compression, and a regular starter can easily turn it. Once the engine is turning, the slight opening of the throttle will let enough fuel and air in to get engine started.

Cheers,

DKjens