TOPIC:

About a month ago I had to switch from a set of Tekei to a set of Mikuni carbs. I of course had to get some intake boots for a 650 to fit the smaller venturi size. I guess the mikuni carbs sit a bit higher because when I bolt my tank back down, I don't have any clearance to swing the petcock lever to prime or reserve. I barely have enough room to wedge the petcock in front of the carbs. Has anyone had these problems on a 750 and can pass some knowledge on how to fix it?

As far as I know, everything on my bike is stock. My petcock just barely makes it past the No. 1 carb when I swing it from On to Off to Reserve. You may have to scootch your tank back a little, or orient the petcock so that the lever clears the carb.
Here's a pic that shows my petcock:

I keep screwing up the picture posting.

Try this one:

ARRGGH!
How 'bout now?

There are some aftermarked petcocks on the market that have a very low profile, and the lever moves horizontally...
It might be worth looking into.
BTW, LTDrider, that is one heck of a beautiful bike!

I have a drag specialist petcock and I have to have it angled to allow it to swing freely without interference from the carbs. Instead of rotating directly front to back it rotates from back and left (off) to front and right (res). The angle is about 30~35 degrees. There was no way that I could screw in the petcock any farther, because I tried, and it rounded off 4 of the 6 corners of the hex area above the switch. I never expected it to be made of such soft metal, but I guess I got what I paid for.

If it isn't hitting by a lot, why not cut the lever a little shorter. It's been done before.
Ride safe,
Les

On my 1980 KZ750H, the petcock is also very tight to the carbs. I did what was previously suggested, and ground off about 1/4 inch of the lever. I also made sure the rubber tank mount pad was well placed to give me the max lift at the back end of the tank. I would have added a spacer if I needed it -- but I didn't.

I did not like the idea of running out of gas in the "on" position, and being unable to switch to "reserve" on the fly, just when I am on the long stretch of the SF Bay Bridge, where everyone goes 60 mph bumper-to-bumper, and there is no place to pull over. I have come to the conclusion that almost everythiing on these motorcycles is a critical safety item, and must work as intended, or better.

It's possible to reverse the action of the petcock lever on the style of petcock in ltdrider's picture so that the lever swings away from the carbs rather than into the carbs.

Remove the screw at the 6 o'clock position below the lever.
Remove the lever/core assembly.
Drill and tap a hole at the 12 o'clock position identical to the 6 o'clock hole.
Insert the lever/core assembly turned 180 degrees.
Insert the screw in the new 12 o'clock hole.

The petcock lever will now swing away from the carbs instead of into the carbs.

Ron