Miss Fire after setting a few days
HI Guys, I really need help with this one. I thought I could fix almost any engine problem but this one is kicking my butt!
I have a 2005 650 Wee with 33,000 miles. The bike has always run great until recently. And it still does if I ride it every day but if I let it sit more than about 4 days or so, it will start right up but soon starts missing on one cylinder. After a few minutes it is idling mostly on one cylinder with the other one kicking in once in a while. If I accelerate hard, it runs on both cylinders but will still miss some as the RPMs get up around 7000 and above. As the engine warms up it starts running better and better and after 10 or 15 minutes it is running great. So for the first 5 minutes it runs worse as time goes by, then for the next 5 minutes it runs like crap, then for the next 5 minutes it starts improving and then it is fine. So of course by the time I get home it is always running fine so I can't even diagnose which cylinder is the problem.
Here is what I have done so far. I replaced both plugs, synchronized the carbs, cleaned the air filter, checked the valve clearance, and ran three tanks of gas with injector cleaner. No help. An just to make more interesting it isn't consistent. Some times it is real bad and others not so much.
Also this started after I got home from a 950 mile trip with the last 100 miles in the rain. Then I washed all the mud off. The next morning it ran like described above but I assumed it was just because it was still wet. Sure enough it cleared up as soon as the bike got good and warm but I have had this problem every since. I have had it out several times for 200+ mile rides so it should not have any residual water issues.
Any one had this problem? Any ideas? HELP!!!
DL-650 K5, Givi crash bars, Givi windshield on Madstad mount, heated grips, hand guards, tall touring seat Givi racks, side cases, top box, and SW Motech center stand. Home made skid plate.
Some previous bikes:
84 Honda CB-700SC (restored)
97 Suzuki DR350 (still have)
78 Yamaha DT175 (restored)
82 Yamaha SX400
70-73 (Race years) YZ250, YZ125, MX360, YZ360...
69 Yamaha DT-175
68 Yamaha DT-360
70 Suzuki TS 250
70 Kawasaki Mach 3 -500
64 Honda 250 Scrambler CL-72