I have a 95 flstf Evo...my bike has been giving me a bit of a headache was hoping someone could help...it's a stock 80" Evo it has a S&S Super G carb (came on it when i bought the bike) When I dump on the throttle my bike bike feels like it's going flat and feels like it cuts down to 1 cyl...I figured I might have a carb issue so I rebuilt the S&S G..it seemed to have helped at first at idle but when I took it down the road the problem is still there...I thought maybe it was the accelerator pump, but after rebuilding and being confident in my rebuild I don't believe it is. At 50-70 in 5th gear my bike was cutting out and feeling like it would drop down to 1 cyl..I stopped at a stop light for about 3 min and when i took off i know my bike was only firing off 1 cyl..i babied to my work and pulled and inspected the plugs my back plug was fouled out, so i cleaned and re installed them...i have rebuilt my carb, changed out my plugs, and tested my coil..wich is in spec... The Main jet on my carb is .068 and my intermediate is .295. My assumption is that this carb is just to much for the bike...but i could use some troubleshooting tips or any help from experience that people have...
Here is the rundown:
stock 80" Evo, stock ignition system, freshly rebuilt S&S super G, good coil
engine goes Flat when dump on throttle at idle or up to speed
50-70mph 5th gear feels like drops to 1 cyl
found back plug fouled out
I would appreciate any help i can get

I don't have access to a computer all the time but I will check back in regularly to keep updated on my findings and your help

 

That carby is a bit over the top for a stock 1340 but even so, the rear plug shouldn't be fouling so bad unless there are issues with the flanges/gaskets/accelerator pumo alignment etc.

Some people use as hotter grade plug on the rear to solve this issue but a stock Evo should run more even than that.

Anyone got a CV carby you can borrow?

 

I'm looking around for a super e...do you think it could be ignition related? I was pretty sure it wash fuel related till i rebuilt the carb and its still doing it...guess i could have messed up but the only semi complicated part would be the check ***** and spring in the accellerator pump

 

Nah, not ignition, they run wasted spark so its the same on both pots.....Harleys often run rich on the rear pot, if your carby was OTT the scenario would be extreme...swapping to a Super E would be a good idea and replace the manifold to head rubbers while you are at it, it may be that the front is running weak and the rear is running how both would if the leak wasn't there....food for thought my friend.

 

To say you're over carbed is an under-statement. Someone might trade you for an E on EBAY perhaps.

And I was never a big fan of the ignition systems on the 90's Harleys either. My favorite was the mechanical ( advance weights) Dyna S Dual Fire Ignition with a good 5 ohm coil.

Very dependable and not expensive.

 

Thanks for the help, I'm gonna pick up a smaller carb and redo my intake gaskets, i will keep year posted. When i switch carbs will i have to change the manifold too?

 

The G is just too much carb for the motor, as stated. Maybe find a guy with a big inch motor who has a Super E and swap him, don't forget to get the manifold too.

 

Yes, the manifold on a "G" is 2", ( if I recall.) The "E" is 1 7/8".

Good Luck

 

somebody else just had the same problem. The G carb is too big for a stock 80" motor, the E is what you want. I have a G on my 111" chopper and have become familiar with it, so when I was looking to upgrade my evo I went with the E. Same carb, just a little smaller. Works well and is easy to tune/tweak. I ended up with a .28 intermediate and .68 main. EV27 cam and 9.5 KB pistons.

 

I have a G on my S&S 107" motor, although they fit an E on the newer 111". As for carb size I had my bike stroked, plus a lot of other tuning mods and the carb supplied with it was not man enough. The bike wouldn't respond to the throttle when opening it quickly. So I fitted a much larger carb and got the sort of symptoms you describe. The carb flooded the engine when opening the throttle quickly, reverse of the previous problem.

I suggest you do nothing until you have a more suitable carb.