What causes a motorcycle exhaust pipe to backfire?
Running rich not only drastically decreases your miles per gallon, but can cause severe backfires in the exhaust pipe.
Why is the rear cylinder on my Harley not firing?
The rear cylinder is firing but is very weak. When the bike is idling I can pull the rear plug wire and not a lot changes. When the front wire is removed the bike falls on its face and dies. The front cylinder is running super rich and the rear seams to show little to no color on the plug.
What causes the reversion problem on a Harley Davidson?
A remote possibility is that one of the rear cylinder cams is made wrong–timing mark in the wrong place relative to lobe position. If this is an air/fuel ratio problem, it will be in the pilot or idle circuit of the carb, not the main jet.
Where do the exhaust pipes cross over in a car?
They cope with this by having the two front cylinders exhaust straight into the muffler (via the heat exchangers which are also the headers), but the two rear cylinders have headers internally in the muffler. The header pipes actually cross over inside, so the left rear vents close to the right tail pipe and vice versa.
Why does my exhaust pop when I decelerate?
Generally speaking, an exhaust pop on deceleration will come from a lean condition, and there are several things that could cause that. Since it’s only happening on the rear cylinder I’d check the manifold intake gasket for that cylinder and also make sure there’s no air leak around the injector itself.
How does exhaust system design affect engine performance?
Tradeoffs exist between looks and performance because exhaust system design has a significant impact on engine performance. Header pipe diameter, pipe length, bend radius, muffler volume, and even baffle design affect performance. Make the pipe too long or too short, too big or too small in diameter, and performance suffers.
How does a factory exhaust system work on a bike?
This stock factory exhaust includes a crossover- pipe, which increases airflow by allowing each cylinder to share both small mufflers. Crossover pipes typically improve midrange performance at the expense of aesthetics. 4. The rear cylinder on a stock factory dresser routes exhaust gases to both mufflers.
What causes a backfire on a Harley Davidson?
My Harley Davidson heritage softail has an annoying backfire from the rear cylinder when I let off the throttle on the freeway or when I’m coming to a light. I just had the top end rebuilt completely rings valves heads refaced etc plugs are new exhaust system is tight no leaks.