Bucking Bronco

[Travis398]

Wow, those look nasty.

[Scooterbob]

Just a little. But they all good now. 

[jvb_ca]

Its amazing the amount of crud that comes out of a gas tank and accumulates in the carbs and the bike still runs, isn't it? I just replaced my tank with a clean one and you should have seen the crud and rust on the sending unit. I was afraid to look inside closer. All better now though.   

Your FJ is gonna love you for cleaning the nasties out of there.

Cheers...Jake

[Scooterbob]

Just finished the relay install on the coils. Even synced the carbs again. Holy Batshit Batman!!!  What a difference! 
Now I gotta do the clutch spring mod, cuz it slips like a mutha-lover with all the new torque. But not complaining. 

[Mark Olson]

If you can get the oil light to come on during hard acceleration then it will be tuned right.

you are on track with the clutch spring ,almost there.

[Scooterbob]

Seems to be one ongoing detail I cannot figure out though.

My idle is set at 1000 and the "blip" test show the rpm drops correctly, but when I drive it continually likes to hange around 2000-2500 and then slowly come down. Sometimes it stays there until I bring it down by holding the brake and letting the clutch out a little. Then it idles fine. Also, when I give full throttle around 5000 rpm it pings a little.
Cable has free travel and has the recommended 5mm of slack. Mixture screws at 2 1/2 turns and carbs balanced beautiful with carbtune guage.

I was thinking maybe too rich, but would that explain the ping and throttle hanging?  All else seems really good and power is excellent.

Ideas?

[Pat Conlon]

Bob, sounds like a vacuum leak that pops up when the bike is hot. I assume that there are no leaks (cracks) on the carb boots.
Check the o rings on the idle mixture screws. When you pulled the idle mixture screws out for cleaning did you put new o rings on, along with remembering to put the little washers and springs back on the needles, before you put the needles back in the carb bodies?
Now that the carbs are clean, review for us your carb settings:
Idle mixture screws: How many turns out?____________
Main jet #:__________
Pilot jet #:__________
Needle clip position (from the top):__________

[Scooterbob]

I did not put new o-rings on the mixture screws. Could not find them in a timely manner. But I did inspect the old ones and put the washers/springs back in correctly.

Mixture screws set at 2 1/2 out. All jets are the stock ones that were already in there. I merely cleaned everything really good and changed the other o-rings. Boots all looked good, but are old. Did not touch clip. Only washed that part (diaphragm assembly) with warm soapy water and inspected.

[racerman_27410]

if you are running a 4/1 pipe you may want to go out with those pilot screws another turn or so and give that a try.


KOokaloo!

[Scooterbob]

if you are running a 4/1 pipe you may want to go out with those pilot screws another turn or so and give that a try.


KOokaloo!

Does a lean mixture cause the hanging high idle? I thought it would be the opposite.
I'm running totally stock system.

[Scooterbob]

Update:  Adjusted mixture screws last night to 3 1/4 turns out.  It seems to have fixed the hanging rpm problem, but need more driving.  Since this morning was a FREEZING 62 degrees coming to work, I'm not sure if it will act different on my 80 degree ride home in stop and go traffic.  I will let you know. 

[carsick]

By the time it gets to 62 degrees, I've started using my mesh gear.

[Scooterbob]

By the time it gets to 62 degrees, I've started using my mesh gear.

The mere thought of you in all "mesh" is a little disturbing. 

Ha ha ha.

[carsick]

By the time it gets to 62 degrees, I've started using my mesh gear.

The mere thought of you in all "mesh" is a little disturbing. 

Ha ha ha.

Oh no, I don't wear ALL mesh. Just the chaps.

[Scooterbob]

By the time it gets to 62 degrees, I've started using my mesh gear.

The mere thought of you in all "mesh" is a little disturbing. 

Ha ha ha.

Oh no, I don't wear ALL mesh. Just the chaps.

Do they have "Harley-Davidson" stamped on them?