Posting here because it's probably more carb generic than Magnum-specific. Finally got my 2012 Magnum on the road again today after many months on the sick list for electrical problems. Started fine at first and ran well on a 20-mile road run at mostly 40-50 mph, but about halfway thru -- engine good and hot by this point -- it started missing at lower rpm and wanting to die at stoplights. I presume I need to make some carburetor adjustments, just need a refresher on what to suspect first -- mixture, throttle setting, something else? Might or might not have anything to do with cold versus thoroughly warmed up engine. (For background, I've replaced the OEM vacuum fuel pump with an electrical pump, and the OEM air cleaner box with an AutoZone special that attaches directly to the carb's air intake.} I'm also going to take a look at the spark plug for clues ….
Next day: May have found it, little cone-shaped air filter I installed in place of OEM came loose and fell off, s carb is sucking in too much air. Replacing that might fix the problem, hope so.
So, spark is good, carb flooded -- gas gushes out of the back when I crank it. Fires with a spritz of starter fluid but then quits. Looks like I might need to remove the carb and check it out, something apparently sticking open? Left everything open to air out overnight first, will see tomorrow.
Last Edit: Sept 21, 2019 10:50:36 GMT -6 by ellpee
Well, it sat idle at the workshop for quite awhile awaiting Ice Bear parts from China by kayak, so no surprise if something's gummed up. Seems like if jets were clogged there'd be less gas, not more, so will pull the carb and check the float ?and maybe the diaphragm? Or maybe I'll try just spritzing in some carb cleaner first and see if I can avoid some work that way.
AHA! Quick eyeball check reveals carb side of intake manifold cracked bigtime, almost completely separated! Surprised at that, big thick semi-hard rubber, would not have expected a failure there. Back to Amazon!