I had this motor for a long time I bought it for a old bike. I never got around to build it. So I bought it in 2012 0r 2013 it came with a messed up seal. So I told them so they sent news seal. Then it got thrown in a storage tote maybe five miles on it. A couple month ago I ran across it in garage. So I misplaces the new seal. So ordered some put them in. Then it had a big air leak at welds on off set intake fix that now here current. I tried everything two carbs two intakes and two throttle cables. Pulled head new gasket torqued 12ft lb. Now it runs but idling stays about 1/2 throttle, idle screw would do nothing. Now different story when going down the road throttle works then. So i went back to check seals again don't like magneto one ordered again waiting now. The seal might of been good but just in case. If that doesn't fix it then I'm going to check spark plug leaking next, once I get it running again. Then checking everywhere for a leak. Oh its a big mouth BGF engine which I like the metal seams a lot better then the engines now days. Back then in 2012 I ordered everything from BGF they really treated me great. I was just asking for other idea's to check just in case I missed something. I've checked slides in carbs with air filters off. Thanks guys.
