Re: Project Cheap Racer (ver.2)
Hey man, good to see you are putting a little love into an XJ... they are fun bikes with the right things done to them. I have 3 of them, so I have seen a lot when it comes to these. I will say this, a lot of your problems are going to be coming from running those carbs without the airbox. I figure by now the airbox it long gone, but those hitachi carbs really don't work well without proper tuned length runners. the stock aibox also adds some twists and turns that help the carbs pull air in correctly. You could fix things a bit by adding the stock airbox inlet runners and attaching pods to them. then with proper jetting, and a carb sync, she should run pretty darn well. You might loose a couple HP as opposed to the stock airbox... (funny thing about these bike was that Yamaha engineers did a ton of research on these bikes and the stock setup is almost as much HP and you can get out of them before you start replacing the expensive parts ie, pistons, cams, etc.)
Let me know if you have any questions, it looks like you are in AZ, but if you ever wanted to tune it up and were in the so cal area, I would be happy to help... I have all the little specialty stuff like the YICS tool, carb sync, color tune, etc.