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52 8n won't start

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08-03-2006 19:37:07

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Need help, I have a 52 8n which has performed flawlessly for the years that i have owned it. However it is letting me down now. I have neglected it since winter, i work at sea and haven"t really been home, but i have started it a few times, not for more that 5 minutes though.

I have checked for spark which i get at all cylinders, and i put a new battery in (6 volt) it does seem to be turning over a little slow, but for some reason she won"t catch. Really it hardly even sputters. I have opened the carb to check for dirt and it was beautiful. I have even tried starter fluid, and nothing at all. It was running perfectly when i put it away, surely the fuel isn"t too good, but i have put dry gas in it, besides that starter fluid should have fired.

I figure that with an up draft carb, the engine has to turn over fast enough to draw the fuel air mixture in, so if it is not turning that fast it wouldn"t get fuel. Does that sound right? Any suggestions would really help the fields are getting tall!

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Dell (WA)

08-03-2006 21:36:04

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 Re: 52 8n won't start in reply to 8njohn, 08-03-2006 19:37:07  
John..... ....ya say ya been to sea huh? Well you should be very familiar with corrosion. Your 6-volt N-Electricals are also very succeptable to "invisable" corrosion. Besides the obvious ignition points (polish them by gripping a dollarbill between the contacts, or brown paperbag works too) The leaded battery posts and clamps. (they make nifty batterypost polishers and clamp cleaner tools, go shopping)

The real secret electrical trick is a good ground. Back yer 8" starter screws out about 1/4" and scrub with wirebrush or wirewheel in a drillmotor, the gap between the starter endplate and the tranny starter hole.

I recommend replaceing the 5"-flatbraid rusty sheetmetal ground cable with a 12"-flatbraid grounding cable bolted to one of yer steering gearbox bolts. This will make yer 6-volt starter sing.

And replace yer invisable corroded sparkies with NEW AutoLite 437 sparkies. (check gap = 0.025")

Iff'n you still think you have weak sparkies, make a calibrated sparkie tester from enny ol'sparkie by bending the side electrode out for full 3/16" gap. Now clamp the metal shell with visegrips to enny convienient brackett. Plug enny sparkie wire that will reach to top of tester. Now with ignition switch on, tranny in neutral, crank yer starter motor and watch yer calibrated tester for blue-snott sparkies. Iff'n weak and wimpy yellowish/orangish sparkies, you've still gott points problems.

The last time I tested my 6-volt 8N sidemount for sparkie quality, it was jumping a full 3/8"-gap with blue-snott authority. (I bought a new commercial adjustable sparkie tester and was fooling around, grin) It can be done..... ..Dell, yer self-appointed sparkie-meister

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08-03-2006 21:22:31

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 Re: 52 8n won't start in reply to 8njohn, 08-03-2006 19:37:07  
I'm with Bob. If I had a dollar for every time I heard someone say they had spark.. and then state it won't hit on starter fluid.. I think spark or plugs and wires.. etc. ( and I'd be richer than bill gates to boot.. )

Remember.. a spark in non compressed air is one thing.. and a spark under 70-120 psi of compression is another..

If it was in time.. had air, and even 50 -70 psi compression.. starter fluid should have at least made it fire off... so my guess is spark generation system.. or spark delivery system..


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08-03-2006 21:06:55

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 Re: 52 8n won't start in reply to 8njohn, 08-03-2006 19:37:07  
The times you've started it, and let it run only a few minutes, not enough to warm it up, MAY have fouled the sparkplugs.

Assuming it seems to have pretty good spark, and there is gas TO the carburetor, the first thing I would do is replace the spark plugs, or at the very least burn the tips clean with a plumber's propane torch, and give 'er another try! (Be safe, burn the sparkplugs clean in a SAFE area, away from gasoline, and combustibles.)

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08-03-2006 20:40:09

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 Re: 52 8n won't start in reply to 8njohn, 08-03-2006 19:37:07  
You say you have spark at all the plugs. Is it a brite blue spark?? If not you might need to put in new points and condenser. If it is then pull the air intake tube and with it out of gear and turn on hold your hand over the carb intake. Does it suck on your hand and does your hand get wet from gas. If no to either one pull the drain plug and make sure you have a good flow of gas from the carb drain. If not you have a clogged line or filtr. If yes you may have stuck rings and you should put about a 1/4 cup of tranny fluid in each cylinder to help unstick them and up the compression

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08-03-2006 19:51:48

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 Re: 52 8n won't start in reply to 8njohn, 08-03-2006 19:37:07  
I"d start by going through the wiring starting with the battery cables and take each terminal apart and shine the contact surfaces really well. That should fix the slow cranking and get you a hotter spark. Is it time for a new set of points, and plugs? Air cleaner service?

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08-03-2006 19:44:10

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 Re: 52 8n won't start in reply to 8njohn, 08-03-2006 19:37:07  
I doubt you're not getting gas. Its a gravity feed. I'd start with the simple things first like the points and maybe replace the condenser. Not really much info to go on.

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08-03-2006 22:03:44

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 Re: 52 8n won't start in reply to Dave(Tx), 08-03-2006 19:44:10  
Now my 2 cents worth.I agree with all except I hate to start throwing parts at something until I know they"re bad.Therefore since you said it did run perfect you might try towing it to start just remember to turn the key on.If and yes if it starts you can then start replaceing parts so it won"t happen again.

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