I don't think there is any downside to it. My 261 will get one this coming spring. Yes, the combustion chamber is of a pretty funky and inefficient design which is just why you might consider it. The single throat carb has to feed that motor from idle to wot so there are some compromises built in. One is that at idle and off idle, it can sometimes run a little fat so the multiple sparks might help get you a cleaner more complete burn. As you said, you only have your time in it.


Mike