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intermitent miss (sputter) no load ONLY!
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Posted by rasputen on January 08, 2005 at 19:56:44 from (68.53.121.67):
I am trying to find the ELUSIVE cause for no-load sputtering on my '47 8N.
This is a common problem with 9N,2N,8N flatheads....and yes I have both searched the archives (a LOT) and posted on the N board. NO ONE posting _Knows_ the cause! This "sputtering" is at idle (400rpm) & some at a slightly higher idle with NO LOAD. Any slight load causes the sputter to completly disapear!
Also will sputter down hill, clear up after level (float is fine). Several N experts recite begenner trouble shooting tips like rursery rymes & some have just said it is the nature of the beast, they all doit.
It really is just a pet peeve as it is my only problem left after 15 years of having this tractor.For years I assumed! it was valves, till I pulled the head & valves & replaced & lapped them.NO CHANGE. I suspect this is a cam/gear slack/dist timing issue....just from the no load only apearance. Hopeing someone here can shed some REAL light other than saying something over & over real in 'cute'venacular. I have done much work including,
MMO for freeing valves,lapped valves,rebuilt carb & re-checked again & again (including lapping the halves),installed Petronics Electronics Ignition, re-replaced the AL437 plugs (gapped .025 & tried .030,.035). The front mount dist has new bushings & weights are free & working, new solid core plug wires. Several good coils.Timing is correct & rechecked.
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