I've been battling a carb cough problem since last year. 1990 80" Evo with an EV27 and V&H Short Shots with baffles. I tried the James blue intake seals, which I was told would guarantee to stop intake leaks......well I sprayed some WD on the intake flanges from the horn side this past weekend and lo and behold, the Idle stumbled. Trip to my toolbox and out came 2 new HD stock intake seals and on they went. I took my time and made sure everything was lined up and used some dish detergent to slippery them up. Put everything back together, dropped down to a .45 from .48 pilot and took it for a ride to test and get it up to temp. Cough was still present, and actually seemed worse especialy when blipping the throttle while down shifting as I came up to stops. :wall
Came back, resprayed WD and found no change in idle so I stand here thinking the intake seals are not/no longer leaking. Put the .48 back in, re-rode to test and it's back to the occasional cough. Does it only after idling at a light for a minute or so and blipping the throttle to take off. Runs and pulls strong everywhere else, even idles well (except when I knew there was an intake leak and the idle was all over the place from light to light) and the plugs although a little tanner/darker than I would like indicate that it's a bit on the rich side.
From what I've heard, 87 octane fuel actually burns hotter and is easier to ignite than 93 which is all I've ever run since I bought the bike 2 years ago.
Could this slightly richer pilot, and 93 harder to ignite fuel (if true) be the source of my frustration? I plan on running this tank out and give the 87 a whirl. I only ran 93 to eliminate the possibilty of detonation (never heard any pinging) My timing is dead on at 32* which early Evos are very picky about, and I don't tend to lug it around in higher gears up hill or when riding with the Mrs.
Any suggestions or thoughts would be appreciated.
Great forum btw:s
Came back, resprayed WD and found no change in idle so I stand here thinking the intake seals are not/no longer leaking. Put the .48 back in, re-rode to test and it's back to the occasional cough. Does it only after idling at a light for a minute or so and blipping the throttle to take off. Runs and pulls strong everywhere else, even idles well (except when I knew there was an intake leak and the idle was all over the place from light to light) and the plugs although a little tanner/darker than I would like indicate that it's a bit on the rich side.
From what I've heard, 87 octane fuel actually burns hotter and is easier to ignite than 93 which is all I've ever run since I bought the bike 2 years ago.
Could this slightly richer pilot, and 93 harder to ignite fuel (if true) be the source of my frustration? I plan on running this tank out and give the 87 a whirl. I only ran 93 to eliminate the possibilty of detonation (never heard any pinging) My timing is dead on at 32* which early Evos are very picky about, and I don't tend to lug it around in higher gears up hill or when riding with the Mrs.
Any suggestions or thoughts would be appreciated.
Great forum btw:s