silentrob

I forgot to mention I was putting new plugs in today too. Didn't get around to the carbs. I had already changed the fuel filter yesterday. There was some fuel in the oil when I drained it. My understanding was that this is usually a carb problem. The thing is I've usually heard of this on bikes where the petcock was left on when the bike wasn't running. With a vacuum petcock, I wouldn't think there should be much fuel getting in with the oil.

I just bought an '82 XS400J (Maxim) this week. It ran pretty well in the around the block test ride I took, but it was a little short in power. Of course there was nothing but flat ground in that neighborhood. After getting it home I took it around the block, which includes a good sized hill, and I noticed a huge loss of power. A little longer ride on a hilly road and it seems to do pretty well in the flat spots, but when I hit a hill I slow down to about 25 mph, even with wide open throttle (in 2nd gear). The tach is reading around 4000 rpm. As soon as I hit flat ground again the revs go back up, as does the speed. I plan to do an oil change and probably take the carb off for a cleaning tomorrow. Is there anything else I should be looking at?