YS is strictly glow. Yes they are on the expensive side but well worth the money IMO. You can always keep a keen eye open and get a great deal from somone who got in over his head with one and is selling cheap. A trip to YS service and it comes back with a clean bill of health. My 140 came to me in pieces, cost to repair was 40% of what the new engine would have cost and has become my favorite glow engine. I have a 120 that is about to be sent in. Found in a storage locker. Once you learn the unique tuning and care of a YS they are fantastic engines in all respects.