Cheeze Posted September 2, 2014 Report Share Posted September 2, 2014 Hello everyone. I've been doing exensive mikuni reading and forum searching to get this far so I hope my question is specific enough to get some help. Banshee never really idled correctly since I purchased it second hand. I just did the top end to one size larger than stock. I cannot get this thing to idle and have to use the outside slide screws to open the throttles past the pilot system. I have the carbs balanced at this point but lots of riding problems when doing this. There is no smooth power from launch. It's very hard to ride the trails going from "idle" to basically 1/2 throttle. Plus it's hell on the thumb to constantly be that far into the throttle and I want a proper running motor. Starts fine as-is with a couple kicks with the choke on. The engine immediately dies if the side throttle screws are backed out (I'm not sure what those screws are really for). The carbs are super clean, I have been through them about 6 times now completely apart with carb cleaner and compressed air. Adjusting the air screws does nothing for the idle if the slide screws are backed out, it dies if they are full in or full out. Engine bogs a little when snapping the throttle open but feels great past 1/2 throttle. I also checked the carb boots for any rips / leaks and just installed new reed valves. So my question is: should I go smaller or larger pilot air jets? Or did I somehow mis-diagnose my problem? List of mods below, thanks a million for any suggestions from people who know these things. 0.020 Overbore w/ Wiseco Pistons FMF Fatty Pipes FMF Core 2 Silencers Stock cylinder head VForce 3 Reed cage w/ new reeds K&N Filters Stock Pilot Jets (as far as I know) 320 Main Jets Stock timing Quote Link to comment Share on other sites More sharing options...
Cheeze Posted September 2, 2014 Author Report Share Posted September 2, 2014 Installed a new choke tube that is tight to the carbs on both ends. I'll order up some 27.5 pilots but how do I tell what size I have in there now? I pulled out the stock ones to clean and there were no marks on them at all. Thanks for the help. Quote Link to comment Share on other sites More sharing options...
Evans Ward Posted September 2, 2014 Report Share Posted September 2, 2014 If there isn't a number on the PJ, I'd put those aside and order some genuine Mikuni jets. Was it the same for the main too? Best to be safe when you are jetting your motor. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted September 3, 2014 Report Share Posted September 3, 2014 Definitely gonna need at least 27.5 pilot. If the airbox is uncorked and you have good reeds, a 30 pilot jet. Quote Link to comment Share on other sites More sharing options...
oldskool Posted September 7, 2014 Report Share Posted September 7, 2014 When you say slide screws, I'm guessing you have tors delete kit on your carbs. When this kit is installed, it is necessary to grind down some material where new idle screws go in order for screw to actually move slide.while looking in carb from breather side, turn screw in to see if slide moves up. Just a thought Quote Link to comment Share on other sites More sharing options...
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