92 F2, 2,300 miles, sat for 8 years with gas, yuck. Tank was presurred cleaned by a radiator outfit and sealed. Carbs removed via great article here. I replaced the pilot jets and cleaned everything else. Bike started, ran perfect for 6 miles. Idled and was responsive, literally ran like a brand new bike. Then after steady cruise around 55 for 4 miles or so it acted like it was running out of fuel. Took it home and took everything apart. Needles, jets, floats, everything looked fine. There was no sediment or anything in carbs. I removed the pilot jets and they looked clean. Put everything back together with an in-line fuel filter. I've ridden around 100 miles. The bike starts easily with choke but runs rough. After a minute or two without choke it idles reasonable well. Accelerating with partial throttle the bike seems hesitant. Somewhere between 3,000 and 4,000 rpm the bike seems to start running better and pulls reasonable well and generally sounds okay. If I run around 5,000 for more than 3 or 4 miles the bike eventually acts like its running out of fuel and dies. Today, after sitting by the side of the road for about 5 minutes, the bike started with the choke. I immediately shut the choke and it idled fine. I rode home (10 miles) not going over 4,000 rpm. The bike ran rough but I made it home. The weird thing to me is the first time out after new jets the bike idled and ran like brand new. The floats are not adjustable

 

This is just a stab in the dark but if you seem to be starving for fuel while riding, pull over and pop the gascap. If there is a whoosh! then either the gascap vent or fuel tank vent is clogged.

 

Recently had the same sort of problem, check the fuel pump contacts and change them if stuffed I got mine cheap online from England about $31 from memory. I also changed my regulator/rectifier with a cheap Chinese online one for $20. Now going better than ever. Want any more info and pics on what I did you can go to my blog bazzasmotoblog.blogspot.com.au hope this helps and the moderators dont mind my blog link in this post.

 

jdarrough Re: The floats are not adjustable, on the F3 you just bend them then measure them for correct height would think the F2 would be the same. Look on utube for videos about F2 correct float heights you should find some easy to follow videos on there.

 

+1 Fuel pump is a great place to start, but also, if you haven't replaced fuel lines, that could be an issue as well. There could have been a bit of gunk on the lining of the lines that broke loose and got hung up in there. Also, check your petcock for the same type of issue.