2 cylinders, 2 different AFR's
Ultimate HDF Member
Joined: Oct 2005
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From: Union Bridge, MD
You might try asking that question here. There has been a lot of talk about AFR's and tuning at this link:
https://www.hdforums.com/forum/elect...on-thread.html
https://www.hdforums.com/forum/elect...on-thread.html
Road Warrior
Joined: Apr 2010
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From: Suffolk, England
Depends how much difference you are reading.
There is a difference between the two cylinders, was also on the carb bikes but you had little control over it.
Generally the rear cylinder runs a little richer to keep it cooler as the air flow to it is less.
If you have a large difference between the cylinders then it might be worth looking for a fault like the inlet seal, spark plug, etc.
There is a difference between the two cylinders, was also on the carb bikes but you had little control over it.
Generally the rear cylinder runs a little richer to keep it cooler as the air flow to it is less.
If you have a large difference between the cylinders then it might be worth looking for a fault like the inlet seal, spark plug, etc.
Ultimate HDF Member
Joined: Apr 2008
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From: Out on Deranged
Temperature at the rear cyl is higher, main reason being that it is hidden by the front cyl. And maybe, don't quote me on this, but the rear cyl fires a split second later than the front.
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Road Captain
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Lot of tuners give you this info.
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Road Warrior
Joined: Apr 2010
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From: Suffolk, England
You can do this with most programming tuners (TTS, SEPST, etc). Its just that its usually done with one AFR table and then the difference in fueling is adjusted in the cylinder-specific VE tables.
This is one of the nice differences between carb and EFI, of course. With a carb you throw the fuel in the manifold and it, hopefully, gets split evenly between the cylinders. With sequential port fuel injection, each cylinder has its own injectors near the intake valves.
This is one of the nice differences between carb and EFI, of course. With a carb you throw the fuel in the manifold and it, hopefully, gets split evenly between the cylinders. With sequential port fuel injection, each cylinder has its own injectors near the intake valves.
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