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Author Topic: Now what did I screw up?  (Read 3135 times)

The Garbone

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Now what did I screw up?
« on: July 13, 2012, 12:50:26 AM »
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?
Gary
57' RE Crusader 250
67' Ford Mustang
74' Catalina 27 "Knot a Clew"
95 RE Ace Clubman 535
01 HD 1200 Custom
07 RE 5spd HaCK

* all actions described in this post are fictional *

jedaks

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Re: Now what did I screw up?
« Reply #1 on: July 13, 2012, 01:25:15 AM »
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

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Re: Now what did I screw up?
« Reply #2 on: July 13, 2012, 01:56:26 AM »
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. :(
Jim
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ace.cafe

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Re: Now what did I screw up?
« Reply #3 on: July 13, 2012, 02:35:15 PM »
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.
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Blltrdr

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Re: Now what did I screw up?
« Reply #4 on: July 13, 2012, 03:44:07 PM »
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.
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petersonte

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Re: Now what did I screw up?
« Reply #5 on: July 14, 2012, 05:53:21 AM »
You need one full servicing. Just do it .

 

The Garbone

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Re: Now what did I screw up?
« Reply #6 on: July 20, 2012, 10:03:18 PM »
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?

« Last Edit: July 20, 2012, 10:37:13 PM by The Garbone »
Gary
57' RE Crusader 250
67' Ford Mustang
74' Catalina 27 "Knot a Clew"
95 RE Ace Clubman 535
01 HD 1200 Custom
07 RE 5spd HaCK

* all actions described in this post are fictional *

ace.cafe

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Re: Now what did I screw up?
« Reply #7 on: July 20, 2012, 10:36:16 PM »
What's the jetting?
Sounds like it needs richer in the needle jet.
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The Garbone

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Re: Now what did I screw up?
« Reply #8 on: July 20, 2012, 10:38:16 PM »
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.
« Last Edit: July 20, 2012, 10:44:40 PM by The Garbone »
Gary
57' RE Crusader 250
67' Ford Mustang
74' Catalina 27 "Knot a Clew"
95 RE Ace Clubman 535
01 HD 1200 Custom
07 RE 5spd HaCK

* all actions described in this post are fictional *

ace.cafe

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Re: Now what did I screw up?
« Reply #9 on: July 21, 2012, 12:11:08 PM »
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.
Home of the ACE Fireball 535 Bullet,  Ace GP Hi-Lift Roller Rocker Head . Pistons, cams, etc. Highest performance Bullet engine mods available .  AVL mods. Redditch 700/750 Twin mods. UCE kit soon.

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The Garbone

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Re: Now what did I screw up?
« Reply #10 on: July 21, 2012, 03:29:06 PM »
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.

« Last Edit: July 21, 2012, 03:32:18 PM by The Garbone »
Gary
57' RE Crusader 250
67' Ford Mustang
74' Catalina 27 "Knot a Clew"
95 RE Ace Clubman 535
01 HD 1200 Custom
07 RE 5spd HaCK

* all actions described in this post are fictional *

ace.cafe

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Re: Now what did I screw up?
« Reply #11 on: July 21, 2012, 03:36:57 PM »
Are you using NGK BR8ES, or equivalent heat range spark plug?
Home of the ACE Fireball 535 Bullet,  Ace GP Hi-Lift Roller Rocker Head . Pistons, cams, etc. Highest performance Bullet engine mods available .  AVL mods. Redditch 700/750 Twin mods. UCE kit soon.

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The Garbone

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Re: Now what did I screw up?
« Reply #12 on: July 21, 2012, 04:07:52 PM »
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.
Gary
57' RE Crusader 250
67' Ford Mustang
74' Catalina 27 "Knot a Clew"
95 RE Ace Clubman 535
01 HD 1200 Custom
07 RE 5spd HaCK

* all actions described in this post are fictional *

ace.cafe

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Re: Now what did I screw up?
« Reply #13 on: July 21, 2012, 05:00:39 PM »
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.
Home of the ACE Fireball 535 Bullet,  Ace GP Hi-Lift Roller Rocker Head . Pistons, cams, etc. Highest performance Bullet engine mods available .  AVL mods. Redditch 700/750 Twin mods. UCE kit soon.

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Arizoni

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Re: Now what did I screw up?
« Reply #14 on: July 21, 2012, 09:47:03 PM »
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.
Jim
2011 G5 Deluxe
1999 Miata 10th Anniversary