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  #1  
Old 1 Week Ago
Don Biter's Avatar
Don Biter Don Biter is offline
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Default Sputter

I need help from the masses. First some history, I have a 1970 XLCH. I removed an S&S model B and installed an S&S model E mostly to gain an accelerator pump. It came from a sportster of unknown origin. I looked up what jets to use and it had the recommended ones already installed. At low to medium RPM it runs great, but at high RPM it sputters like it leaning out, I opened the main jet from .063 to .074 in two stages and it didn't seem to make any difference, I can run it up to 60 MPH but if I give it any more it just dies and sputters, I just have to back off a little and it's fine. Should I open up the main jet some more or is the problem something else?
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  #2  
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JonesL JonesL is offline
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Was it running good before the switch?
Sounds like fuel starvation. Restricted flow comes to mind like a partially clogged internal passage or a partially plugged fuel filter/screen. At the point where demand overcomes supply, there you get the sputter. Anything below that point and yer bike will run like the wind.
Pull the jets and run a drill bit(s) that just fits into the passage in by hand. You're just unclogging the passages, not trying to enlarge or deepen them. Follow the drill bit passes with a good blast of air to get rid of any remaining junk. Some of the internal passages on carbs end in a smaller hole into the carb throat. Make sure you direct the air flow from the small end out towards the jet.
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  #3  
Old 1 Week Ago
Nacs Nacs is offline
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The instructions that S&S provides are pretty accurate.

Disable the accelerator pump when you are trying to figure your jetting situation. The accelerator will come in to use later as a supplemental fuel supply when you get on the throttle hard and the carb transitions from the mid jet to the main jet.

Going from a 63 (Do you mean 62 or 64?) to a 74 size is a little like going from a garden hose to a fire hose...UNLESS you know what youre doing. Move up one, maybe two sizes at a time.

Obviously the bike needs to be in good tune as well.

Another issue could be timing. If you dont have enough advance, the engine will hit a wall.

I was hitting the ( performance ) wall on my XLH when I first picked it up, turned out to be that the timing advance unit was frozen and I wasnt getting full advance.

The dude that had my bike before me overjetted, I think he took the super E off a larger engine so it had bigger jets.. Over jetting is VERY common among guys that try to tune their rides. The accelerator pump only serves as cover up for improper jetting too, which is why you disable it to narrow down your jets as best you can.
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Old 1 Week Ago
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Quote:
Originally Posted by Don Biter View Post
... I can run it up to 60 MPH but if I give it any more it just dies and sputters, I just have to back off a little and it's fine...
My 1980 with a Keihin butterfly carb did exactly this when the fuel level was too low. I adjusted the fuel level, was good after that.
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  #5  
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I did all of the above, but I forgot I did install an inline fuel filter when I switched carbs. I will check it first, I have a machine shop and drilled out the main jet on a lathe .003" at a time testing it each time. The E was rebuilt before I put it on. Everything else is the same as before except the fuel filter. I must be getting old I should have thought of that, I'll test it again and let you know what happens.
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  #6  
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I had supply issues with both the in tank strainer and the inline filter installed. You don’t really need both. If the tank strainer is in good shape then just forget about the inline filter. My e ended up with .0295 and .068 jets after following the tuning procedure.
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Quote:
Originally Posted by doodah man View Post
I had supply issues with both the in tank strainer and the inline filter installed. You don’t really need both. If the tank strainer is in good shape then just forget about the inline filter. My e ended up with .0295 and .068 jets after following the tuning procedure.
+1 adding an inline filter isn't necessary and can definitely cause a restriction in fuel. Remember, there is no fuel pump. Just gravity.
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  #8  
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GA_Ironhead GA_Ironhead is offline
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And some inline filters are not intended to be used in a gravity feed system...
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