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Colder Plug for 641 with high compression pistons

A

anwalker

New User
So I ordered a rebuild kit this winter and instead of coming with stocker flat top pistons it came with dome tops. Not knowing any better the autoparta guy crossed the al437 with the champion rc12lc4. My engine is diessling bad and the plug shows symptoms of being lean. I think I may need to jump to a colder non resistor plug? Suggestions?
 
Autolite 216 or Champion H10 would be cooler than the 437.
I don't know about the ones you have in there.
 
How fast does it idle ?? Many times
dieseling is a result of gas still
getting sucked through the carburetor
because the throttle is open too far.
If idling too fast changing plugs will
accomplish very little.
 
(quoted from post at 18:49:36 06/28/16) How fast does it idle ?? Many times
dieseling is a result of gas still
getting sucked through the carburetor
because the throttle is open too far.
If idling too fast changing plugs will
accomplish very little.
Click to expand...

I beleive it's set at 550 right now. She's still going through breakin.
 
Sometimes on my pulling tractors: I
will grab hold of the carburetor
linkage or throttle shaft when I shut
it down and push it closed to avoid
dieseling. Some governors tend to
allow the throttle to open a bit as
the engine rpm slows.
 
(quoted from post at 19:36:12 06/28/16) Sometimes on my pulling tractors: I
will grab hold of the carburetor
linkage or throttle shaft when I shut
it down and push it closed to avoid
dieseling. Some governors tend to
allow the throttle to open a bit as
the engine rpm slows.
Click to expand...

Now that I think about it, I haven't adjusted the governor springs yet.
 
Spark plug heat range is likely not the problem.

Set the idle to 450 RPM or less and reduce the engine to idle speed before shut down.

Adjust the carburetor to obtain correct mixture under load.

Dean
 
This tractor is how my grandfather made his living and the first time it's ever been rebuilt. Started it up to discover the new wedge seals were leaking, along with the radiator and oil filter adapter. I just put the oil pan back on last night and filled her back up with oil, hopefully I'll have the radiator back on this week. I still need to install a new set of points, change the plugs over to 437 or 216 autolite and get the timing dialed in, and adjust the idle down. I pulled the champion plugs yesterday and they were running leeeean. My timing light is on a permanent loan so I'll need to pickup another. Gotta get this thing going and back on the farm. Lots of work to do and running way behind.
 
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