A model engine manufacturer has the ability to send an engine to Walbro to have a carb either developed for the specific engine or to be fit with a carb that will perform the best for specific engine performance parameters provided by the engine manufacturer. The process is quite expensive so few, if any, manufacturers take advantage of the service. Doing so would have saved at least one manufacturer's business. Another manufacturer would have engines that perform substantially better than they currently do. The fact remains that few engines are sold for model use compared to other "industrial" uses so guess who gets the attention? We are but a small drop in a very big pond.

The use of methanol on gas two strokes has always been modifications done by those that wanted to use methanol. Lot's of experimentation, lot's of work, and more than the usual number of dollars spent. Only an extremely small number of people compared to the rest of the engine users gravitate to methanol use, so there's no profit in designing a slew of carbs for different engines.

It is a hobby, and the best performance will always be obtained by those willing and able to experiment through trial and error. That fact is well noted on a frequent basis and can be verified by reading posts from the few people that do the experimenting. It's not just the prop type and size, or the pipe and header. Jetting, flow, and porting play as large or larger. You can't blame those that do the experimenting from posting all that they do. They get nothing in return for their efforts and they get arguements about how what they did won't work, or will perform poorly, or is too much work for the average person. Unfortunately those providing the arguements fail to note that those mods have already been working.

The point? Jump in there and get the hands dirty and you have a fair chance of a great reward. Plan on spending some bucks in the process. What's on the shelf isn't all there is to work with.