backfirte /buk/snort KApow

Anonymous-0

Well-known Member
Got the 511 b on the 8ft disc mower ,it has sat way to long with previous -o, started runnin bad changed points and condenser ,have not changed plugs yet ,,after 15 hrs doing it again , changed condenser with a used one on hand ,, started rite up ,, then went a hundred ft ,, buk /snort DEAD ,, autopsy showed the wire to coil loose , titened all conections , the 500 run like a champ ,so I kept the condenser , thinkin my problem really was loose connections ,, cut about 25 hours..then, buk snort, /ka POWW , backfire ..worst on hot days, sometimes it goes away for about 5 minbutes so I switched back to previous condenser ,..and that 500 aint runnin no better ,..been searchin archives ..should the points be set with a dwell meter ?never done one ,, can anyone coach me ??gonna pull valve cover and chek clearances ,,and if no improvement gonna swap out the condenser
 

Jim,

It's a good idea that you are going to check the rocker arm clearance, Years ago a local farmer had a Farmall M that would run good cold but not hot, a dyno run showed the symptom within minutes of running at full load, after trying all carb settings and ignition parts replaced as you have done I finally lifted the valve cover to find no clearance on several valves, they were right at that point where the valves would close cold but were off their seat enough when hot to fire back into the intake, disrupting all the cylinders.

.020 on the points, if you need a dwell meter to do it I've set a lot wrong in 50 years lol.
 
another thing you might want to look at is the coil itself. I've run across several coils that loose the oil inside them which causes them to heat up and cause strange things to happen.
 
just recallin how the gm shop down the road used to set the dwell in the chevies and Pontiacs ect , some 50 yrs ago ,,ol mechanic , there used to claim that setting the dwell tuned them in perfect ,, I have considered swappin out coils ,,too , but I want to pull the valve cover and chek the valve clearance,and see how dirty it is ,this 164 motor NEVER Had a OIL FILTER ,,, hopefully the motor is clean ..gonna put a vac filter setup on her too
 

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