I'm a complete newbie to this. Are those all weed-eater engines? Any idea what they cost new? There isn't a website somewhere showing how to convert these engines is there? I can't seem to find to much info about the subject. What items are needed in the conversion? I'm assuming a new muffler, prop adaptor, engine mount, and carb. Also, I've read that everyone puts some sort of ignition on them. What's the main problem with using the pullstart? It would be nice is there was some info showing everything needed in converting them, and some price guesstamates.