Now what did I screw up?

[The Garbone]

Got home from work today and decided it was a good time to retorque my head.  Pulled the tank and rocker covers and torqued things down to 21lbs.  Also replaced the intake pushrod and adjusted the new one to spec as the one I had was adjusted as short as it could go and still was a bit on the snug side. 

After putting everything back together I kicked the bike to life it idled fine.  Left the driveway on a trek to find a brick shit house and as soon as I give the bike half throttle it just dies.  Huh?   Took it back to the driveway and discovered if I increase throttle very slow it will rev nicely but if I open the throttle fairly quickly it stalls. 

Sitting here writing this I had a thought that maybe I cracked the ceramic on the plug when I torqued the head down, if that is not it I have no clue.  Any suggestions?

[jedaks]

Its possible it is unrelated to any maintenance you did. That kind of thing happens to me sometimes, i.e. I adjust my brakes and then one of the turn signals won't work!

If my engine is not warm enough a blip of the throttle will kill it. It can also mean a lean condition, like a leak in the rubber carb manifold.

[Arizoni]

Maybe some dirt/rust/debris got loosened up in the fuel line or the tank valve and was washed down into the carburetor when you put the fuel tank back on?

Maybe you jostled some wiring when you removed/replaced the fuel tank?

Do you remember the commercial where the guy says, "Its Broken! Did you touch it?"

Sometimes it doesn't pay to fix stuff that's not broken.

[ace.cafe]

My guess is that the battery is low, or there is water in your gas, or you have some dirt blocking your needle jet in the carb or something.

Water in the gas will act like that.

[Blltrdr]

Mine acted up a few weeks ago and when I opened the carb bowl drain the main jet fell out. Screwed it back in all happy again.

[petersonte]

You need one full servicing. Just do it .

 

[The Garbone]

Ok,

Replaced the plug with a new one for GP.
Pulled apart the carb and checked the float and needle.
Pulled off air filter.
Checked push rods adjustment.
Checked voltage.  She idles at 14.5vdc and revs at 15vdc.

Here is how she acts.   I can nurse it up to high RPM but if I open the throttle normally she stalls.  Also the gas mist is troubling.

Sorry for the shaky cam,  when she starts to spit gas on I kinda did not want it on the camera.



Thoughts?
I did change the push rod before this started.  I would not think a sticky rocker would cause an this.  Also the compression is higher now that I have a proper length rod.  I can stand on the kicker. Could my timing be an issue?

[ace.cafe]

What's the jetting?
Sounds like it needs richer in the needle jet.

[The Garbone]

EDITED:  It is the leaner setup you recommended with a 195 main and P4 needle.   So I would move to a p6?
It is in the high 80s here at the moment.

[ace.cafe]

Yes, I'd definitely try a richer needle jet and main.
Chumma is tuning another Clubman set-up like yours in NJ right now, and it is showing need for a P8 and a 200.
Might need a Q0 for colder weather.

It appears the shorter lift of the rephased cams doesn't allow as much air flow, and this is seeming to affect atomization to some extent, which is showing the need for the richer jetting than the Fireballs.

[The Garbone]

When I pulled the old plug it seemed sooty black.  I will have to check the new plug.

I just ordered a bunch of jets from these guys. Both richer and leaner.


Niche Cycle

Very quick shipping here in Florida.

[ace.cafe]

Are you using NGK BR8ES, or equivalent heat range spark plug?

[The Garbone]

Here is my old plug.





I purchased some leaner jetting in addition to richer because I was noodling it out that with higher compression the mix might be a bit too rich now.  The plug looks rich.

[ace.cafe]

Well, it looks rich.  But it is critical to know if that plug reading was taken at the throttle positions in question.

The other thing is that crack in the spark plug ceramic could be causing some of of the electrical spark to arc to the grounding body, and might be reducing the effectiveness of the spark inside the chamber.
Try a new plug, just to eliminate that possibility.

[Arizoni]

If my spark plug looked that black I would go at least 2 heat ranges hotter as my first step.

With the NGK's that would be going from a 8 to a 6.  Lower numbers = hotter plugs with that company.