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  #1 (permalink)  
Old 05-11-2010, 04:50 PM
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"Running On"

Bike has a 96" s&s, with a s&s carb.

When shutting it off, it will shut down and give a few sputters in reverse. Also hesitates to start sometimes. When turning it over, it will seem to hit compression and struggle to get over the top. I researched and was thinking maybe timeing, had a guy check it all out, he says it's good. Bugging the hell out of me.

Any ideas.


Last edited by Mollard; 05-11-2010 at 04:57 PM..
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  #2 (permalink)  
Old 05-11-2010, 05:05 PM
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have somebody else double check the timing and also check what gas "octane" you are running with that
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Old 05-11-2010, 05:12 PM
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Yeah shit. I have been trying different octane fuels. Seems to do it with most. It ran a bit better with mid grade. I'm not sure what it has for compression.
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Old 05-11-2010, 05:43 PM
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Bike Year, Make, Engine: 2010-14; MYSELF; 96",113",120",127"
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NOT PRECISE Pushrod adjustment? Collapsed lifters?

Slightly loose( or god forbid- bent) pushrods- increase cranking compression and make starter struggle

i don't believe too much advance matters- at cranking rpm the advance is near zero.
But if the ignition is in 'kick start ' mode-it tries to fire right before THE MOTOR HAS A MOMENTUM OF A FEW REVOLUTIONS AND THAT MAKES IT kick back. Make sure it's in electric start position.

Conserve the juice- turn off everything before crancking, make sure batterY is fresh, and use hEavy and short battery cables.

I got rid of the solenoid circle- by installing a push button right against the solenoid core( ~20 bucks at my thumb is stronger than any solenoid to get the bendix gears engaged. A cheap fix for worn out solenoids/starters.
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Last edited by STEINBVG; 05-11-2010 at 05:48 PM..
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Old 05-11-2010, 05:56 PM
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use high test not mid grade fuel
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Old 05-11-2010, 06:22 PM
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High octane fuel is slower burning. That allows a higher cylinder pressure without the air fuel charge burning too soon (pre-ignition...before TDC, detonation). An S&S would most likely be high compression and require 92 or higher octane.

Running backwards when shut down suggests dieseling. Something is lighting the air/fuel without spark. Combustion chamber carbon glowing can fire idle mix. A glowing combustion chamber part (sharp edge, spark plug thread or end, etc.). Or, simple diesel from correct conditions and enough air/fuel mix (simple fix here is often a correct carb adjustment that allows the butterfly to close past an off idle port).

Starting issues may simply be a deteriorating starting system (soleniod contacts, weak battery, connections, etc.)
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