Same in all the gears, that last 1000 rpm down to idle speed it sounds like snapping bubble wrap bubbles.
If I crack the throttle open just slightly the popping stops. If I wind the bike out and then throttle off, it compression brakes nicely all the way down to about 2000 rpm, then it will pop a little bit. I know they set it up to be as lean as possible, and I have not messed with the carbs. My 650 has carbs and its all factory stock. Popping and backfiring is a very subjective thing. Noob motorcyclist, btw.ĭoes anyone have an explanation of what the various mode settings on the FuelPak LCD do?Īll help will be appreciated. My question is whether the engine is still running lean and if this is bad for it. I do not suspect any exhaust leaks as the pipes do not seem to get very hot. It comes back when the engine is warmed up and the ambient temp rises. I noticed that it is almost gone when I start my bike in the morning if the ambient temp is low. I added that, and the bike smoothed out a bit (less jerky throttle response, but very slightly) but the pop was still there. So I wrote to V&H and they sent me another map.
The map was supposed to work fine with stock exhaust (except to run a little rich), and work perfectly with a free flow air intake. I went to the V&H website and downloaded a map appropriate to my model bike and the exhaust. This is how it acts I go off throttle, heavy engine braking (assume due to fuel cut-off), reduced engine braking when fuel is restored, burble, pop, burble, burble, pop, pop, burble, POP! You get the idea. My issue was that there was pronounced decel pop when going off throttle. I bought the bike used with all that already on. I have a 2014 Yamah Bolt R Spec, equipped with the V&H Twin Slash exhaust, VO2 Air Intake and the FuelPak LCD (this is the legacy version with various mode settings that you can input based on map). I have been trawling through the forums to see if my issue has already been discussed.