Bike falls on its face in upper RPMS? Bigger intermediate jet? Woods 650 cam

[King Lear]

So I got my 06 K9 tonight. First let me say this rides like a Cadillac compared to my old 04 Texas Chopper. Has a Woods 650 cam, head work all done by Sam Performance Cycles in Charleston, SC by previous owner. It starts fine, idles fine, runs good through slow acceleration and up to mid RPM range. Once I got it out on the highway and started to get on it a bit when I accelerate in the upper rpm range it sputters and falls on its face. If I back off the throttle it catches and goes. I am guessing this is from the intermediate jet being to small. I am putting a V&H BR exhaust on this weekend and will know what jets are in it then. Ideas? Am I totally off base?

 

[knothead]

If it stumbles or pops in the exhaust its to rich....if it pops or sneezes thru the carb its to lean...3000 rpm and above is controlled by the main jet...intermediate controls lower rpm

 

[King Lear]

If it stumbles in the exhaust its to rich....if it pops or sneezes thru the carb its to lean...

It doesnt pop, it really doesn't make any noise, it just hits a wall and stumbles, will pick up a few seconds, then fall again, once I back off the throttle the engine catches and runs normal

 

[knothead]

Go to s&s website and download the carburetor file....it will walk you thru adjustments to help get you on a base line to work from...accelerator pump adjustment and such....

 

[King Lear]

Go to s&s website and download the carburetor file....it will walk you thru adjustments to help get you on a base line to work from...accelerator pump adjustment and such....

I just did, from what I can see it sounds like my main jet might need to be smaller. I was thinking like I was tuning my car with the intermediate being like the secondary on a double pumper and the main jet being the primary jet on a double pumper. On the S&S carb its the exact opposite.

 

[knothead]

More than likely your going to have to bump up your air bleed jet....which is a main jet that used in the air bleed....i would bump it up to a 60... get your new exhaust on before jetting it....once you get your new exhaust on there let us know what jets is in the carb and we go from there....we get it running right

 

[King Lear]

More than likely your going to have to bump up your air bleed jet....which is a main jet that used in the air bleed....i would bump it up to a 60... get your new exhaust on before jetting it....once you get your new exhaust on there let us know what jets is in the carb and we go from there....we get it running right

I just ordered them so I will have all I need, thanks

 

[Mikeinjersey]

So I got my 06 K9 tonight. First let me say this rides like a Cadillac compared to my old 04 Texas Chopper. Has a Woods 650 cam, head work all done by Sam Performance Cycles in Charleston, SC by previous owner. It starts fine, idles fine, runs good through slow acceleration and up to mid RPM range. Once I got it out on the highway and started to get on it a bit when I accelerate in the upper rpm range it sputters and falls on its face. If I back off the throttle it catches and goes. I am guessing this is from the intermediate jet being to small. I am putting a V&H BR exhaust on this weekend and will know what jets are in it then. Ideas? Am I totally off base?

My 2 cents: Your quote " If I back off the throttle it catches and goes." Pay special attention to your acceleration pump condition and adjustment. If your engine can hit the higher RPM without any issues during a roll on the main jet may be OK. My thought is that Sam Performance would not have delivered the bike after the cam and head work with it running as you describe. Something has changed. Could just be dirt.
May be a waste of time but I would get the bike running right before the exhaust change just so I knew what effect the new exhaust had on the system for possible future troubleshooting. Again my 2 cents.

 

[Sven]

My 1 cent: I have a 3 hole kind of who do I change/figure out?
Idle hole ~ This is sort of the air screw hole with an adjustment at such a low rpm to keep it fired, neither rich or lean .
Low speed ~ This is more for higher [mid] rpm or a cruising blend with the idle still being pulled out too is that fueling.
Main jet ~ This is metered along with the other open two jet holes. All 3 holes [keep feeding fuel or show me the trap doors close] act in a linear move up and down the rpm range.

If I am past mid, falls on its face, it mean no TNT to light off = Up the Main Jet Opening.
If I am past my main jet jetting, I begin to washout the plug, or there is so much fuel, it sparks and stumbles via clumps of fuel, the air is nowhere to be found is that ratio.
If I add choke and the face lifts up, it says it is pulling more fuel to compensate for nature's vacuum back to 14.7 psi.

So where you are at right now in 'fall on face mode' you close the chock and this verifies where to go in the jetting of the main, meaning, it gets worse then lean out. It gets better, then jet up.

 

[FrankBDPS]

Check you're fuel filter and while you have it apart make sure you have good fuel flow out of the tank. How old are the fuel lines? Also check you're fuel cap to be sure the vent is open. How old is the gas?

You're getting a lot of carb advice with out posting exactly what carb you are running.

 

[King Lear]

Check you're fuel filter and while you have it apart make sure you have good fuel flow out of the tank. How old are the fuel lines? Also check you're fuel cap to be sure the vent is open. How old is the gas?

You're getting a lot of carb advice with out posting exactly what carb you are running.

Its the stock carb

 

[King Lear]

Check you're fuel filter and while you have it apart make sure you have good fuel flow out of the tank. How old are the fuel lines? Also check you're fuel cap to be sure the vent is open. How old is the gas?

You're getting a lot of carb advice with out posting exactly what carb you are running.

I actually unscrewed the cap while riding when it was doing it and it made no difference

 

[FrankBDPS]

Its the stock carb

I don't doubt you but it's hard to believe they did all that work and left the E carb and maybe the stock manifold on it. Those items are kind of restrictive in their stock configuration.

 

[mleach72]

I don't doubt you but it's hard to believe they did all that work and left the E carb and maybe the stock manifold on it. Those items are kind of restrictive in their stock configuration.

He should have the G. The E carb and restrictors were just on the 05's.

 

[FrankBDPS]

He should have the G. The E carb and restrictors were just on the 05's.

That's cool. I hope he does.

 

[Mastiff Rider64]

I don't doubt you but it's hard to believe they did all that work and left the E carb and maybe the stock manifold on it. Those items are kind of restrictive in their stock configuration.

The 107s had E carbs. The non epa regulated 117s had a G carbs, some of the epa regulated 117s had E carbs.

 

[Mastiff Rider64]

He should have the G. The E carb and restrictors were just on the 05's.

Some 06 models that were EPA regulated bikes had E carbs also.

 

[mleach72]

Some 06 models that were EPA regulated bikes had E carbs also.

All big dogs 05 and later are epa regulated. Same valves, same compression, epa cams. The E carb doesn't signify an epa engine. They thought they needed the restrictors to pass the new laws. When they realized the g carb was still epa compliant, they went back to it. It's possible there were some 06's that had the restrictors and e carb, but they had to be pretty rare. I used to hang out at the dealer, and all of the 06's I saw had the G.

 

[Jwooky]

. My thought is that Sam Performance would not have delivered the bike after the cam and head work with it running as you describe. Something has changed. Could just be dirt.
May be a waste of time but I would get the bike running right before the exhaust change just so I knew what effect the new exhaust had on the system for possible future troubleshooting. Again my 2 cents.

Good advice

 

[King Lear]

My 2 cents: Your quote " If I back off the throttle it catches and goes." Pay special attention to your acceleration pump condition and adjustment. If your engine can hit the higher RPM without any issues during a roll on the main jet may be OK. My thought is that Sam Performance would not have delivered the bike after the cam and head work with it running as you describe. Something has changed. Could just be dirt.
May be a waste of time but I would get the bike running right before the exhaust change just so I knew what effect the new exhaust had on the system for possible future troubleshooting. Again my 2 cents.

I filled up with premium and plan to ride it some more. I think the bike sat quite a bit. I researched the title and the previous owner that did the engine work had it a couple years and only put 1100 miles on it. Hard to say how much it sat before I got it.