RE: Jett 46 or 50
Let me know how you make out.
Mine was one of the original ARF versions. Fit in there ok if I recall. I guess its all in how you sand and round off the front end. It is a close fit.
You have to cut away near the nose ring? To clear part of the carb I'd imagine ? The rest of the engine is the same bolt in, spacing and footprint size.
If you end up with 1/4" of spacer you will be ok. After break-in on a 9x6 (per instructions), use a 10x6 or 9x8 for the first handful of flights, and with the spacer you will have no trouble pulling a 9x9 or 10x7 after about 30 minutes of air time.
BTW, the Jett muffler bolt spacing is the same as a ST40 and Webra .40
Bob