Recently purchased a 2015 Outlander 800, with 1800 miles on it. It came with snorkel, OEM rad relocate kit, epi clutch (28 inch tires) and looney tuned slip on exhaust. I never noticed it my first couple of rides but I'm sure it was there, after riding for a little while I did start to notice a stumble at low- mid rpm. Seems fine after about half throttle. But now that I've noticed it I can really notice it, even at idle. It also doesn't quite have the power it should when you give it a good shot of gas.
I have a dalton dbo clutch kit waiting to go in which should help a little bit with the way she drives, according to what I've read about the epi kits. But I can notice this stumble even when revving in neutral so there is something else causing this problem. I put the stock exhaust back on and it seems a little better, changed the plugs and checked fuel pressure but the stumble is still there and very evident. I Have been reading a lot and some people say a fuel programmer solved their problems as these bikes sometimes do run too lean just from factory. I Don't want to drop the money on it and still get no where. Any advice would be appreciated. Thanks.