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  #1  
Old 5th December 2018
RREAPER RREAPER is offline
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Default Rear cylinder popping

So ran into a problem with the bike, just finished doing a little overhaul. So bike was a barn find and I got it running and rode for about a week no problem. Then yesterday I went to start it and pretty soon it started popping and spitting blue flames out the rear pipe. Thinking maybe it was too rich I let off the choke and it stalls. So I opened up the carb bowl to look at the jets and they are clean. Then I open up the throttle and to my surprise there's a slimely oil or gas looking varnish on the manifold side of the carb. So I take the carb off and see that it's all over the manifold too and even the valves too. Whole ignition system is brand new ultima module, coil with msd wire and new plugs. The breather bolts were also spitting up some oil into the k&n slip on air filter. Bikes sitting with rear rockers off right now, thinking maybe bad gaskets? Valve seals? Trying to figure out how to load the pictures, bikes a 01 1200 custom
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  #2  
Old 5th December 2018
RREAPER RREAPER is offline
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Default

https://paste.pics/0d29d118eb196f60f6a07fbef1ef645d

https://paste.pics/862ceb16753d0af2b7a10f4acfd96f5d

https://paste.pics/7d219d3f042c636bda48bfe31b50d131
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  #3  
Old 5th December 2018
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Default

Could not get third photo to load
1. Is fuel fresh?
2. Is oil fresh?
3. Static timing on Ultima mid-range?
4. Stock exhaust?
5. Full compression?
6. Stock vacuum operated petcock? If so, is diaphragm intact?
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  #4  
Old 5th December 2018
RREAPER RREAPER is offline
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Default

Fuel is new, oil is fairly new maybe 2 months. It was static timed and ran fine before this. Stock pipes and yes compression is good. Has manual petcock with the vacuum.
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  #5  
Old 5th December 2018
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Default

With a vacuum operated petcock, check the diaphragm for cracks or pinholes, which will draw fuel into the carb.
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  #6  
Old 6th December 2018
RREAPER RREAPER is offline
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Default

Diaphragm looks good, nothing visible. Put a flashlight to it and no light poked through. It slides up and down smoothly. I took off the manifold and looks like it's in the chambers also, comes right off with carb cleaner, so I'm guessing it fuel related not oil? Why would oil be coming from the breathers though?
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  #7  
Old 6th December 2018
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Oil from the breathers is a common complaint, especially if the oil tank is slightly overfilled, loads of info on here about it.
Best to route the breathers outside of the airbox.
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Old 6th December 2018
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Quote:
Originally Posted by RREAPER View Post
Diaphragm looks good, nothing visible. Put a flashlight to it and no light poked through. It slides up and down smoothly. I took off the manifold and looks like it's in the chambers also, comes right off with carb cleaner, so I'm guessing it fuel related not oil? Why would oil be coming from the breathers though?
Not the CV40 carb slide diaphragm, the petcock diaphragm.
...not that it could not be a breather issue.
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  #9  
Old 7th December 2018
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Default

Sorry just caught the typo in my original reply, it's a manual peacock, without the diaphragm. The vacuum is capped off.
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  #10  
Old 7th December 2018
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Quote:
Originally Posted by RREAPER View Post
Sorry just caught the typo in my original reply, it's a manual peacock, without the diaphragm. The vacuum is capped off.
I wondered about the wording and should have asked for clarification.

Regarding harley506d's post: How full is the oil tank?

Both my 2003 and 2002 preferred the oil level to be mid-point on the dipstick...if not, it would "self-level", as my right pant leg could testify.
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