Uthud
Member
I’ve had several issues in the last couple of years that I’ve posted about.
Thankfully, most of the major ones are solved, at least for now. Fingers crossed that the improvements are permanent.
So this is the last issue remaining:
When restarting a warm engine (like after refilling with fuel), I often get a backfire in the exhaust. Sometimes it is really loud.
Have any of you had this problem, and were you able to fix it?
The bike is a ‘97 FLHTCU, carbureted Electra-Glide Ultra Classic. 136,xxx mi. I am original owner. I have had a butt-ton of stuff done in the last few years. Most recently, I took it to a local tuner, well respected, in part to try to make the backfires stop, as well as to verify carb jetting, etc. The ignition timing is spot-on, leak-down test was 8%, carb was rebuilt, intake and exhaust seals and gaskets replaced and verified no leaks, makes 65 hp on dyno, runs and idles great, doesn’t appear to be running rich or lean.
Things I’m thinking might be contributing:
Supertrapp slip-on mufflers, Arlen Ness Big Sucker air intake and filter. Because of the way the Ness filter handles the vented oily air from the crankcase/heads, I wonder if oil vapors are collecting in the exhaust/ mufflers.
I am also wondering if I need to run closed baffle plates in the SuperTrapps vs. the open end plates that I’ve used for 125,000 miles without a problem (seems unlikely, doesn’t it?) But just maybe.
Any thoughts? Or similar experiences?
Thankfully, most of the major ones are solved, at least for now. Fingers crossed that the improvements are permanent.
So this is the last issue remaining:
When restarting a warm engine (like after refilling with fuel), I often get a backfire in the exhaust. Sometimes it is really loud.
Have any of you had this problem, and were you able to fix it?
The bike is a ‘97 FLHTCU, carbureted Electra-Glide Ultra Classic. 136,xxx mi. I am original owner. I have had a butt-ton of stuff done in the last few years. Most recently, I took it to a local tuner, well respected, in part to try to make the backfires stop, as well as to verify carb jetting, etc. The ignition timing is spot-on, leak-down test was 8%, carb was rebuilt, intake and exhaust seals and gaskets replaced and verified no leaks, makes 65 hp on dyno, runs and idles great, doesn’t appear to be running rich or lean.
Things I’m thinking might be contributing:
Supertrapp slip-on mufflers, Arlen Ness Big Sucker air intake and filter. Because of the way the Ness filter handles the vented oily air from the crankcase/heads, I wonder if oil vapors are collecting in the exhaust/ mufflers.
I am also wondering if I need to run closed baffle plates in the SuperTrapps vs. the open end plates that I’ve used for 125,000 miles without a problem (seems unlikely, doesn’t it?) But just maybe.
Any thoughts? Or similar experiences?