Re: Spark plug diagnosis - need your input PLEASE!

Posted by Dell (WA) on March 10, 2007 at 08:14:31 from (172.190.50.57):

In Reply to: Spark plug diagnosis - need your input PLEASE! posted by Steven@AZ on March 09, 2007 at 15:53:37:

Steven.........good photos BTW. Both sets of sparkies show BLACK-SOOT from improper IDLE-MIX adjust. Altho the wet-black sparkie from the Farmall H is more likely from BAD sparkie wire, NOT oil fouling. And it ain'chur carb.

Heres the deal; sparkies have several properties that are confuzzing. HOT-sparkies and hot-SPARKIES. HOT-sparkies relate to physical build of the white center insulator (cold=short; LONG=HOT) Modern NO-Lead gasoline in lightly used tractors (trailer-queens?) need HOT-sparkies to BURN-OFF invisible no-lead deposits for smooth idle. hot-SPARKIES relate to the knocks'ya'azz stuff out the sparkie-wire end.

"hot-SPARKIES" are tune-up related and sparkie-wire related. OLD tractors need copper-core sparkie-wires ($10, cheap) cut-to-fit. DO NOT USE modern carbon fiber core anti-radiostatic sparkie-wire. The anti-radiostatic stuff is RESISTOR which cuts-down the sparkies from the just barely adequate tractor ignition system.

TIP: iff'n yer sparkie-wires ain't soft and flexible like limp noodle, REPLACE'em!!! Why? 'cuz them lazy sparkies gonna be DANCIN' on OUTSIDE of sparkie insulation 'stedda' jumpin' the gap. Always check the sparkie gap per specs right outta the box.

The "proper" way to check yer sparkie heat-range (HOT-sparkies) is to operate yer engine under LOAD and "cut" the ignition at HIGH rpms. De-CLUTCH and coast to a stop. Then read yer sparkie colors; white=too-hot; tanish-grayish=just right; carbon deposits=too-cold; sooty-blackish=too-rich carb mainjet.

Then learn how to adjust yer carb idle-mix. Much to the dismay of gov't smoggy bureaucrats, all carbs need adjustment to match their engine. Thats why theres them handy-dandy carb tweek'ems.

Adjust for maximum/highest idle-speed; NOT SMOOTHEST IDLE, maximum idle-speed. Understand? Don't matter what tractor, don't matter what carburetor, its always MAX-IDLE rpms. And to ears used to sewing-machine whirr of rice-rockets, the ubber-slow tractor pocka-pocka idle is scary. Do the side-pointing idle-mix adjust and idle-speed adjust at least 3-times. tip: most Marvel/Schebler side-pointing idle-mix is BACKASSWARDS, out for lean, IN for ENRICH. Simple, eh?........HTH, Dell

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