I'm sure those screws are anti-tamper. Do you have a security bit set? One of them may fit them. After you're done setting the timing, be sure to replace them with ones you can actually take on and off
Some manufacturers use bolts like this. They are torqued down and when they hit the right spec, the head snaps off. This makes it so they cannot be tampered with easily.I wish it were that easy... but I do think I might have figured it out. I'm thinking the original bolts snapped off and this is what's left
What size Jets did you put in there? just change the main jets? or the pilot jets too.One other thing, if you have the budget for it, is to look for some Mikuni carbs. Either off a triumph sprint, being 36mm flat slide mikunis, or, off an xs750, being 34mm MKII's (which is what I used on my 850)
Sorry took me so long to find out. 1977 XS750D. The 3-1 are from a 1976 750. I'm assuming the tank is off of one of those models as well since its all coming from the same guy/bikeDo you know what year xs750 the carbs are off of?