XJ650 Starting issues

It currently idles fine, and the technician from October said that they had synced the carbs and rebuilt them, but one and four, the compression seems to be low, and I don't know the last time a valve adjustment has been done. So I'm leaning towards. I need to do a valve adjustment into clean the carbs and resync them. I just don't want to, it's so involved. I was debating paying somebody else to do it, since the tech that I'm thinking of bringing it to next month, says there should be a leak down test, but I also don't want to do that either. I'm just frustrated.