After fouling 4 spark plugs in a month of riding, we knew there was a bigger issue at hand. Why was I running on one cylinder after a mile or so? You could actually hear the difference and feel the compression was weaker coming out of the left side exhaust. Tried a few tests to single out the biggest issue. First as shown above, we pulled out the air filters. They were new and clean. Put them back on. Seemed like the bike was having an issue with fuel starvation. The seconded you let out the clutch and give it any gas/throttle, it puttered out. When you got it to idle, it was low (1,000rpm); went about a mile then weakened and puttered out. Sounds just like it’s worded, the bike was literally starving for fuel. The next step was to see if the tank really was as clean as it looked. I pulled the gas lines from the petcock coming out of the tank. Gas evaporates easily, making sure the gas is at the off position, pull the lines and let them drain the little bit of gas in them. You can pull the tank off by wiggling it off of the rubber boot near the seat (seat open of course) then tilting it forward and pulling back, removing it from the two round place holders towards the front forks. Set the tank aside on a flat surface with the petcock free to drain. I placed a gas can and funnel underneath the petcock and let it drain in the on position. Fuel was only coming out of one side. I drained the tank and set it aside. removed the petcock and opened her up.
After taking it apart, i cleaned it with solvent, let it dry and reassembled it. After it was cleaned out all its goo, I sprayed compressed air through all of the parts. I then reattached it to the tank, refilled the tank and ran it in the on position again, into the can. Fuel came through both ports! Seemed like that was the answer, but that was just the answer to the fuel issue.
Then I removed the lines and ran clear line, bypassing the fuel filters to see what my gas was looking like.
There was sediment in the lines. Tank was cleaned a second time. Old tanks that sit around for a while are tough. Even if they’ve been cleaned a few time, shaken around with nuts and bolts, the vibrations of the bike being used often again can shake loose all kinds of things you don’t see. We replaced the original lines with the filters and hoped for the best.