I have 2 Saito 100s, one in a U-Can-Do with a high mounted tank and one in a Harrier 90 with it even with the tank. 15/4W APC props. Both are excellent runners and there was, and is, no fiddling with the HS needles. I run both with an F plug very rich with a long smoke trail and have never had a flame out or kick back. On the U-Can-Do I had a minor siphoning issue prior to starting but I looped the supply line up around the top of the cowl and that cured it.

Saito is my brand.