Sundowner, I've read in this thread that the 7-35 suffers lean mixtures at the high end of throttle travel with the stock carb. Maxam has had two 7-35 engines " eat themselves" after a few runs I assume due to too lean a mixture at full throttle. To preclude that, some others have switched carbs on the 7-35 to a Saito, much like the 7-77 carb upgrade from stock to an OS carb. The problem that I see with the conversion on our engine is getting someone to machine an adapter for the engine to accommodate the Saito carb. I've contacted CH Ignitions and asked if they could make an adapter (they have one for the 7-77 and OS conversion). They are willing to make an adapter for the 7-35 but I think I'll need to send him the Saito carb (haven't heard back from him). It's not too expensive to accomplish the conversion on the 7-35, probably less than $100 US as the carb is less than $50 and hopefully the adapter will be around the same cost as the 7-77 adapter (around $38). I consider this mod a safeguard to burning up valves on the engine for less than $100. Have you had any problems with your upgraded stock carb? Hope this helps as I have no experience yet but have read this thread several times to capture important information. Ed