I just got out my 1/8 buggy (my only nitro model) after about two years on the shelf. It's a Thunder Tiger .21 Pro engine.

I noticed it acts funny at idle. When I let off the throttle and let it idle, it idles nice and low for about 2 seconds and then revs up some... and idles higher. Otherwise it runs fine... except I had it running rich on the high speed needle, maybe too rich.

Is it too lean on the low speed needle? I don't recall adjusting this needle before.

Thanks