jetting

Hey all. I picked up a low mileage but long-neglected 1979 XS400 for a song that the PO had started chopping up into a cafe build. The bike had been sitting for a long time and was not running. The cafe style is what I was going for anyway and I'm at the stage where I'd like to get her running...

I have been running the bike for a week now, '78 XS400. Just put 30 miles on today and wanted to see what you all think of what these plugs might be indicating. I can't tell for the life of me whether they're running lean or ideal or what, it's just something I haven't picked up yet, and the...

So, I'm in the process of rebuilding the carbs on my 80 xs400 (BS34) and pretty much have one of them back together, when I noticed that the Pilot Air Jet (#55 on page 67 of the Haynes manual) says that it is a 155, I think (pic. added). And in the book it does not have that same description in...

Hello all. I have a 1979 2f that runs pretty well. But has had a flat spot at the end of the pilot to needle transition. Now...the p.o used some kind of lighter density foam on the filter cages as he probably saw what oem cost.... bIke has stock exhaust and pamco. I have cleaned many...

I got these (http://www.dimecitycycles.com/vintage-cafe-racer-caferacer-bobber-brat-chopper-custom-motorcycle-exhaust-parts-17-inch-reverse-cone-megaphone-muffler-80-84030.html) from dime city cycles I don't plan to change the air filters will I need to rejet? Would that be up on the main, the...

Hey guys, I am looking into buying some aftermarket air filters. I am really new to this and do not know all that much about the carb. stuff. I understand that most aftermarket air intakes and filters require upjetting, but from what I understand, this also has something to do with whether or...