I am stumped

[79XS11F]

If it truly is non E premium sitting for a few years should not affect it's degrade as much or corrosion/chemical reaction with the parts turning the fuel green. Let my 70 GTO sit for 3 years with 1/2 tank of Sunoco 260 and fired right up when an emergency caused me to put it back on the road. Still would have some problem with evaporation but did not experience any difficulties with MMO added, it's unbelievable what this stuff can do to clean the fuel system tank/carbs/valves/pistons.

The premium gas is what's in it now not what was stored in her.
Rob

[79XS11F]

Rob,
JAT, have you tried another spark plug in #2?
Maybe it's a bad plug? Had that happen to me once.
New set of plugs, one was factory defective internally.

If not, and #2 is quite a bit cooler at the header than the others, I'd focus on that cylinder... (ignition, fuel, compression...)
I wouldn't think it would be a coil problem, but perhaps a wire.
Coil should affect 2 cylinders, I would think...but ya never know.

If it's ignition miss, it will show up on your vacuum guage when it happens.

Header temp trick is a good indicator of cylinder performance, and helps identify which one's giving you the problem, most times.

The plugs are going back into the engine randomly so it is likely a different plug at least a few times. but I will be checking them as well. I have lots of them here LOL.

[79XS11F]

Been a while since I've seen you. Check the diaphram for holes in that #2 carb or at least verify the lip is seated properly.
Did you get the Katana restored? Hope to see you at next years rally. Coming up to Ottawa next Friday to drop my daughter off at Carleton U. Pm me your address again, I know your close so I could drop by and have a listen. I can bring a set of known carbs with me for you to try. Then we'd know if it's carbs or ignition. You could chase your tail for weeks. I busted my right hand so wrenching is out for me but sometimes two heads.......

Hey Mack, I will check the diaphams again but they looked good and do stay in the up position when ther air box side mouth port is covered. If your comming up and can bring a set of known good carbs that would be excelent. I could have the bike ready to receive them, pop them on and see what happens. I will PM you my address and phone # and let you know if I sort her out myself bertween now and then. y compression gage is not working so I cant confirm compression but i really have no reason to beleive that there a top end issue going on.
Rob

[mack]

Stuff

Rob I'll bring some stuff with me. We can do the compression and install the carbs after. Do you need coils. I have some accels here that are brand new, mean for my E but we can check them out . I'll bring new plugs and caps just in case.

[79XS11F]

Rob I'll bring some stuff with me. We can do the compression and install the carbs after. Do you need coils. I have some accels here that are brand new, mean for my E but we can check them out . I'll bring new plugs and caps just in case.

Hi again Mack, I have the excel coils off my hop up bike installed now so I'm pretty sure it's not the coils themselves but could be the signal to them from the pick ups which I have confirmed don't have any broken leads. I'm goeing to continue to work on these carbs for now in case I can get her going. I still think it's some carb issue due to the way the RPMs float when I give the throttle a twist and let go.
Rob

[79XS11F]

Okay, carb 1,3 and 4 are on the money for the fuel level bench test but #2 is still flooding. Needle valve is soaking in carb cleaner as I type this so I'm really hoping this is the issue given that #2 is the carb that the others are synced to.
Rob

[mack]

Well

actually #3 is the carb asll the others are sync'd to. But with one of the other three flooding it will cause a big stumble. Sounds like your getting close. May want to check to make sure the float isn't holed in that carb. Do the old boiling water trick and watch for a tril of bubbles. Or shake the crap out of it if the lady is home and won't loan you a pot. If it has any fluid in it, it's toast. Let me know either way cuz I have a couple spares that are good.

[vedgar]

brass float repair

If you suspect a float has a hole, use a heat gun or hair dryer and heat the float slightly. Any gas or moisture in the float will be apparent on the outside of the float. A touch of solder to the leaking area and the float will be as good as new.

[79XS11F]

If you suspect a float has a hole, use a heat gun or hair dryer and heat the float slightly. Any gas or moisture in the float will be apparent on the outside of the float. A touch of solder to the leaking area and the float will be as good as new.

I have replaced the brass floats with plastic floats that are not hollow.
Rob

[79XS11F]

actually #3 is the carb asll the others are sync'd to. But with one of the other three flooding it will cause a big stumble. Sounds like your getting close. May want to check to make sure the float isn't holed in that carb. Do the old boiling water trick and watch for a tril of bubbles. Or shake the crap out of it if the lady is home and won't loan you a pot. If it has any fluid in it, it's toast. Let me know either way cuz I have a couple spares that are good.

Hey Mack, My Factory manual says #2 is fixed and to sync #1 to #2, 3 & 4 to each other and then pair 3 & 4 to 1 & 2. In any case I changed out the needle valve and it appeared to be sealing but fuel level was way to high or it still leaks. I'll be looking at it again tomorrow to see if the needle is getting fouled when the carb is turned over or if in deed it is still leaking.
Rob

[mack]

Rob

Just try matching 1&2, then 4 to 3 then bring all four in line with the center screw. The master idle is linked to #3.

[79XS11F]

Yes, Master idle is controled at #3. I will not attempt to sync and idle them untill I get this #2 carb issue settled.
Rob

[WMarshy]

Yes, Master idle is controled at #3. I will not attempt to sync and idle them untill I get this #2 carb issue settled.
Rob

JAT, using a thicker washer under the float needle seat will lower the fuel level in the bowl by the difference in thicknes of the AL washer vs the fiber washer. Might only translate to a mm or 2 but just thought I would mention it...

[BA80]

I had that issue with the early carbs. If you overtighten the float valve in the carb body it'll crack and leak.

[skids]

Fiber washers are sold at Lowes (and maybe Ace) but they are pretty thin, so you will have to probably double-up with those to prevent too much bending of the tang.