Rubbermount_EVO Rear cylinder not firing?

[sportsterdoc]

Originally Posted by Rico 05R

Crank Position Sensor

High probability, as George already suggested.
If coil tests good, then 99.9999% probability.

[gmross]

I would suggest checking that you don't have a leaking intake manifold. This was exactly my symptoms, removed the Carb and manifold and was then very very anal about tightening up the manifold in a very uniform manner.
Problem fixed that easily. Of course that's after a bunch of top end engine work and I chased the coil naturally first, and then pulled the side cover to check the installation of the new Cam set and then leaking intake.

[gary450sl]

Thanks guys I will check these bits tonight if I get time after work its nice and sunny and my ride don't go so not food

[s_howard]

Im having the same issue the back cylinder plug is always black and it looks a little wet.. and I stutters when I accelerate hard. I installed new plugs and new crankshaft sensor? but it runs perfect only problem is when I get on it? any ideas? 2004 sportster 1200xlc .
thanks

[gmross]

Is it missing or not firing at idle?
Based on the age I would suggest purchasing a new set of intake manifold seals. Be very anal as you reinstall the manifold and torque up the four socket head bolts very uniformly.
Solved my problem.