Hi boys, looking for some help and hoping you fellers could assist me. I bought this carb last year to install on a Z400 with a 434 engine bore, 12.2-1 compression, both Hotcams, full Trinity Racing pipe and running no Airbox. When I bought it, the kid who sold it to me said it had the Boyesen Quickshot cover on it. The AP cover is for sure some other metal than the rest of the carb body so I am assuming it is aftermarket and is possibly the Boyesen 1 because it doesn't look like the boyesen 2 or 3. I included some pics to aid in the identification. I am also curious to know what year of bike this came off of. If I remember correctly, the kid told me it came from a Yamaha YFZ but what year I don't remember. I want to know this for the identification of what jets to buy. **EDIT** Carb has a P/N stamped on the body reading 5TGC 30UG13 Either way here are pics I took of the carb.