Dyno or fuel Commander?
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5th Gear
Joined: Mar 2007
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Dyno or fuel Commander?
I have an 06 Bob with a stage 1 and SEII slips ( Big City Thunder Baffles),
Do i need some kind of fuel commander or will just a dyno do?
Runs good, slight popping on decel, backfires if i dont shift cleanly.
Do i need some kind of fuel commander or will just a dyno do?
Runs good, slight popping on decel, backfires if i dont shift cleanly.
Road Captain
Joined: Jun 2007
Posts: 644
Likes: 0
From: NE. Pennsylvania
RE: Dyno or fuel Commander?
Anytime you alter the stock settings on the efi bikes, through exhaust system etc your going to need to a download or SErace tuner with a dyno. You altered your bikes ability to read the proper fuel and air flow combination for your new set up it.Not surewhat fuel commander does, but I believe its a spin off of theSE race tuner and not as expensive.
I had the pop and back fire issueon decel and the dyno, racetuner fixed it. It may have been resolved because of a different issue but my dealer didnt say differently.
I had the pop and back fire issueon decel and the dyno, racetuner fixed it. It may have been resolved because of a different issue but my dealer didnt say differently.
Road Captain
Joined: Jun 2007
Posts: 644
Likes: 0
From: NE. Pennsylvania
RE: Dyno or fuel Commander?
FOUND THIS INFO ON THE FORUM ... This may help with some questions to your problem.
One of the most common problems that people complain about is the spit-cough-pop from the carburetor as a Harley Davidson motorcycle goes from idle to ¼ throttle. This can occur on any motorcycle, any carburetor, but seems to happen most often with the stock CV Keihin carburetors used on the newer (90 up) Big Twins and Sportster models. This condition is not only annoying, but can cause the Harley Davidson motorcycle to stall dangerously at stoplights, and can damage intake seals parts. It is even possible to ignite oil or gas residue in the air cleaner causing a fire! If your Harley Davidson motorcycle has these symptoms, there are several causes and several easy fixes.
Common causes of motorcycle carburetor spit are as follows:
Problem:......................Solution:
Fouled plugs................Change motorcycle plugs, check gap.
Intake leak..................Spray manifold/head seals with carburetor cleaner, listen for RPM change.
Timing incorrect...........Check timing with light, lube/replace advance weights if used.
Idle mixture incorrect....Adjust low speed mixture screw/re-jet low speed circuit.
Accelerator pump bad....Remove air cleaner, check squirt, check diaphragm.
Bad coil or wires...........Check coil & wires with an ohmmeter, replace if bad.
Any of these can cause the problem, but luckily all are easy to fix.
We have found that the EPA lean setting of the carburetor is too lean for most applications. Through trial and error, we have settled on the #45/46 pilot jet as the best starting point for most engines.
The #42 used in most Harley Davidson motorcycle models is to lean to adjust out with out turning the screw so far out that it is no longer affecting flow.
One of the most common problems that people complain about is the spit-cough-pop from the carburetor as a Harley Davidson motorcycle goes from idle to ¼ throttle. This can occur on any motorcycle, any carburetor, but seems to happen most often with the stock CV Keihin carburetors used on the newer (90 up) Big Twins and Sportster models. This condition is not only annoying, but can cause the Harley Davidson motorcycle to stall dangerously at stoplights, and can damage intake seals parts. It is even possible to ignite oil or gas residue in the air cleaner causing a fire! If your Harley Davidson motorcycle has these symptoms, there are several causes and several easy fixes.
Common causes of motorcycle carburetor spit are as follows:
Problem:......................Solution:
Fouled plugs................Change motorcycle plugs, check gap.
Intake leak..................Spray manifold/head seals with carburetor cleaner, listen for RPM change.
Timing incorrect...........Check timing with light, lube/replace advance weights if used.
Idle mixture incorrect....Adjust low speed mixture screw/re-jet low speed circuit.
Accelerator pump bad....Remove air cleaner, check squirt, check diaphragm.
Bad coil or wires...........Check coil & wires with an ohmmeter, replace if bad.
Any of these can cause the problem, but luckily all are easy to fix.
We have found that the EPA lean setting of the carburetor is too lean for most applications. Through trial and error, we have settled on the #45/46 pilot jet as the best starting point for most engines.
The #42 used in most Harley Davidson motorcycle models is to lean to adjust out with out turning the screw so far out that it is no longer affecting flow.
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