This thing just keeps rolling. I've been waiting for years to sell him a replacement 66cc when this 49cc dies. It's a super cheap old kit from some dude's brother. (Lol!)
Very noisy, greasy and generally a beater.
Does not even have an actual roller on the tensioner! The chain runs over a fixed guide with no bearings or roller at all! Loud, lot's of drag and is just about indestructible.
Just finished replacing the brake pads again (3rd set I've done) and it's back to the grind for this workhorse.
If more is better, then too much is just enough.
If you can't afford it, build it yourself.