yea one of the guys has a lawnmower shop so I guss he might have never worked on a engine? mabie mabie not .one races lawnmowers one races two stroke gokarts with a big walbro carb and does use diophram So i guss they know it all lol.I think what part made them mad was me knowing what they didnt.I should have them work on a engine lol.I kinda think alot of the lawnmower and small engine shops dosnt like stuff they have never seen or know about.I took a big bore carb to a small engine shop one time and they wouldnt sell me a rebuild kit for it.it was a walbro 11 mm.I know they had to know what would work.but they didnt like the idea it was for rc use i guss.Thats one reason I use carbs off of other engines like chainsaws for weed eaters.There used to be a good shop not to far from me they guy would let you go in the back and check stuff out.but he was bought out by one of the guys I was talking about. wont sell you a rebuild kit for weed eaters or anything.need to find another good engine shop for parts.Other then the bad stuff I am about done with my 1/4 cub with the nitro/gas 25cc homie put on the side windows the other day and played in the yard.I did end up using full time glow.I could be done in about an hour but the cold weather with snow turned to mud today babie when I start to see some good days Ill get done and go fly it!!!!!