well for me David I rarely buy into the stuff I see posted on the internet cause what happens is the people that are pissed are more prone to post about their problem than the people that are satisfied with the product. If I experience something personally then I'm a believer. I heard the rumblings about the carbs on these engines - but I bought them anyway cause I saw one in action and it was screaming.
I got one that runs fine and i've had zero problems with the stock carb or any of these premature failures freakah is talking about. I've got another that is the same engine that I could not get to run well. Well - correction it ran like a champ best engine I've owned for 3 minutes, then if it got remotely hot it would act erratic and cut out. I chased needles for 2 days until finally giving up, it didn't matter what the needles were set at the end result was always the same. So what to do at that point?
1)Send it back and hope the manufacturer gives up something? Unlikely - the engine's been used clearly - hard to make a case for refund.
2)Sell it to someone else?
Not cool in my book - passing of a known problem to another racer is bad Karma
3)Break it down for parts or sell it cheap clearly describing the problem?
an option - but you end up losing big $$$.
4)Try a nova based carb from one of your other engines and see what happens?
bingo - I don't like that I have a perfectly fine RBX12 that has no carb on it now, but it was sitting in the toolbox anyway so it could stand to give up its carb. End result is the motor is IMO much better of the bottom and equal on top to any of the stock nova's - so you see why it may be worth it (or maybe I'm trying to justify to make myself feel better.