I've got a Ryobi 875R, I put in a carb rebuild kit. It starts ok but will only idle. I can't get it to speed up. Does anyone have a parts breakdown of the carburetor? It runs ok but one go above idle. Any ideas? There is a tube that enters the bottom of the airbreather and comes from the bottom of the engine. Is this using engine suction to operate the carb? The accelerator linkage is hooked up and in fact if I release it from full throttle it dies. Help.