Join Date: Apr 2016
Location: Concord, MA
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OK, i finally started tearing into it. it would run great for 20 mins and then lose all power. it would run a little rough but it would idle. the symptoms repeated time and time again. i rode it hard for 20 mins, then it started losing power again so i took off the air box and tried revving it. it continued to bog, so i squirted gas into the carbs while hitting the throttle. well the motor started to scream again, so that tells me i'm running lean when it gets hot? i disconnected the vacuum fuel pump (not electric) and checked that it was drawing and pumping gas and it is. once i connected everything back up, it only runs now for 5 seconds, wait 10 mins and it runs for only 5 secs again and again. I disconnected the fuel supply hose to the carbs and installed a clear tube to that nipple and filled it with fuel like a gravity fed line. once the fuel level in the tube settled, i started it, watched the fuel level drop for 5 seconds and it stalls again. it will not start again unless you wait 5-10 mins?????? I then hooked up my gravity fed tube to the back of the fuel pump and the exact same thing happens. I'm now trying to see if it's an electrical cut off by checking spark after it dies? Any help appreciated. I'm stuck.
2007 BF 650i; Bigger jets, EPI springs, HMF muffler, K&N Air, CDI, engine brake override, reverse 4WD override, EPS just added. 26's just added.