Re: Carburetor Tuning - resolved

Jim Boone wrote:

> Back in the garage this morning and started from scratch.   While 
> attempting to re-balance the carbs I noticed #3/4 weren't sucking as 
> hard as #1/2.  I could even place my hand over one of the throats and 
> the engine wouldn't stumble or die.  I ran a compression test and 
> found  #1/2 where at 150psi and #3/4 where at 110psi.  Ugh.  I'm going 
> to give up for the day and pay someone to tell me what's wrong. 


I finally got things fixed and it only cost an hour of labor.  There
where several things wrong
- I ran the initial compression test without having the carbs at WOT.
Re-ran and all cylinders where about 200psi
- Carbs were out of sync
- Some junk was in the float bowl of the rear carb and bits of swarf
had stuck in the idle jets
- One of the ventures was loose when the carb was cool.  When warm it
didn't wiggle.  This took some time to find
- A new set of plugs for good measure
- Swapped from 45f9 to 50f9 idle jets to correct for a lean condition
off idle

Thanks to everyone for the help.

-- 
Jim
www.unibrain.org
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