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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 8th October 2018
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Default Backfiring/Poor running....??

Hi,
I recently bought a 1973 XLCH and am having problems getting it running properly. It had been subjected to some poor maintenance over the years but seems basically straight. When I bought it, it had a standard points ignition, a Screamin' Eagle Kehin carb and drag pipes. It was a pig to start, it kicked back and ran lumpy, coughhed back through the carb all the while.

I discovered the carb was in poor shape and had no support so there was probably air getting in everywhere. I changed it for a CV carb, new Tite Seal mounting rubbers and a support bracket. I also changed the points for an Ultima electronic ignition. The fuel tank was a bit cruddy so I gave that a clean out also and fitted a new fuel line, I have tried with and without inline filter. Running the Screamin Eagle K&N filter and back plate and standard looking cover.

There are now lo air leaks I can find either at the intake or exhaust (refitted). I have checked the timing as oer the Ultima instructions a couple of times and it seems correct although I haven't been able to strobe check it. I have out a new vented gas cap on as the old one was a bit 'old'. I have fitted correctly gapped new plugs. It fires up straight away first or second kick but then after a minute starts coughing back through the carb when you twist the throttle half the time. Go for a ride and it coughs and pops back through the carb and just kind of dies and then goes occasionally. It is not running well! Oh, I also replaced the pushrod seals and have correctly adjusted the tappets.

Is there anything I have missed here? I'd be grateful for any advice as it is becoming real frustrating. Please excuse the typos, doing it on my phone with no auto correct!
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  #2  
Old 8th October 2018
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Did it come with a new (ultimate) coil or are you still using the points coil? Inside the top of the cv carb, is the diaphragm intact?
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  #3  
Old 8th October 2018
TonyGall TonyGall is offline
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what colour are your plugs ? if they are black and sooty its running rich, the prime suspect for that is a leaking float needle.
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Old 8th October 2018
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Yes, it came with the new coil. Also the plug colour is fine, biscuit brown. Diaphragm in the carb is also fine. The fuel filter in the bottom of the tank had picked up a bit more crap so I'm cleaning that again just in case. It's a mystery to me..


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  #5  
Old 9th October 2018
1Scooter 1Scooter is offline
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Sound like a lean out condition. Check the accelerator pump shot. Might want to check the float setting too.
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Old 9th October 2018
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The float setting is fine, already checked it. Will double check accelerator pump.


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Old 9th October 2018
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I've just got mine going right after carb issues ,it seems they really need the accelerator pump working right, I tried a screamin eagle carb but ended up using the pump part on the standard keihin. Your welcome to the rest of the carb , sounds like your in the uk so I can post it, good luck
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Old 9th October 2018
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“Coughs, then goes again occasionally” almost sounds like either fuel flow - dirty tank/carb, not enough flow out of the tank, float set too low, and/or lean jetting. Or any combination of these. Another thing that can mimic these symptoms is an intermittent short, but since you already mentioned crud in the tank, I’m betting on the fuel system.
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Old 9th October 2018
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I'm cleaning it out again. I think there may be a short as well, just to confuse things. I turned the key to 'lights' and there was a spark from the key area and the motor died until I switched it back again. Also the the headlight has started dimming when I pull the front brake! Looking like it's more than one thing.......


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Old 9th October 2018
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Quote:
Originally Posted by jonesboy View Post
I've just got mine going right after carb issues ,it seems they really need the accelerator pump working right, I tried a screamin eagle carb but ended up using the pump part on the standard keihin. Your welcome to the rest of the carb , sounds like your in the uk so I can post it, good luck


Thanks for the offer but the CV I have fitted is in as new condition. Might need to check the jetting..


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