The mighty white hunters!!  Yeah I would have screamed too!



Frank/Rebop

Bristol, In ( by Elkhart) 

We're at the cabin this weekend. A couple of minutes ago, the 3 legged bear was here. The front door wasn't shut tight, and he pushed the screen in and the door opened, we all screamed. I believe we scared him as much as he scared us.



  Dennis in Lititz PA

Maybe a bad fuel pump.

Are the other carbs set up as secondaries?  If not, you can swap one of those and see if it is the same.


Lawrenceville, GA

It does the same thing running on just the center carb.

  Dennis in Lititz PA

Well, I got her out tonight for the 1st test drive and it isn’t the float needle. I can shut off the fuel to the outside carbs and loosen the linkage and just run on the center carb and see what it revs like on just the center carb.

  Dennis in Lititz PA

Make sure you clean out your accelerator pump nozzles tubes in all three carbs.  They actually stop up with fuel contaminants quicker than the jets, and they will not give you that shot when the throttle blades first start opening, and that will cause the lean mixture.  Joe-JDC 

JDC

The silver ones must be a modern replacement.



Lawrenceville, GA

I’m thinking the outside carbs are coming in around 2500, judging from my foot pressure on the gas peddle. I took the tops of the 3 carbs off this evening. The front and center carbs had these silver colored valve assemblies. The rear carb has a brass needle valve. I have enough to change the front and center to the brass needle valve. I’m hoping that the front carb wasn’t getting fuel. The photo from above shows the front carb is cleaner. Maybe this has been going on for a while. I poked a straight pin in all 6 jets, they were open. I’ll see if I can get it back together tomorrow night.



  Dennis in Lititz PA

Surging at cruise or under light load is classic lean condition, with backfiring, a lot lean..... Usually you would up the main jets to cure this, but in your case since it has been running in this configuration, something in your fuel delivery has changed or there is a vacuum leak. Conjecture again,  maybe one of the 2 main jets is plugged

Dennis:

When you are at 2500 under load, are you getting into your secondary carbs?  The reason I ask, I have had experience with older stock Viton needles getting swelled and softened by our wonderful alcohol laced gas.  Your secondary carbs probably don't get a lot of use in street driving, so the floats keep pushing the needles into the seats and they don't get a chance to drop out.  So when the gas leaves the carbs, the needles don't let more in.  Opening the throttle without fuel would amount to a huge infusion of air.  This is conjecture on my part, but you have been running this tripower for a lot of years without this issue.  Something has changed in your system.







 

John - "The Hoosier Hurricane"