Hi I have just finished an in frame Honda with EZ Motor. I'm new with this 4 stroke setup. I had some chain wear on the frame. I'm going to use a chain guide to avoid that. But when I opened up my EZ drive area I noticed black soot from the belt and metal shavings. I checked the front pulley everything looks visibly okay and in place. I don't know if some of the metal scrapings from the frame ended up in the drive area or not. When I let off of the gas there seems to be a winding up sound in the gear box. I have the belt as tight as it can go according to the bolt holes. I'm using a flex water heater pipe as an exhaust. I hope it is not the engine getting a back up from exhaust some how. Any Ideas?