Posted by Dan G on April 14, 2010 at 15:42:24 from (208.111.212.26):
I have never seen a machine that worked perfect when I parked it in the fall give me such a fit getting it running again. I've done just about everything I can think of as suggested in a previous post.
parked it in the fall, under roof (dry). Treated fuel, shut off fuel at tank. Carb was rebuilt professionally last summer with good results.
Went to start it over the weekend, and it won't fire once. Not a cylinder. I replaced today and yesterday: Coil, wires, cap. points and condesner were replaced last year... Pulled the plugs, dry. They were new last year. It won't even fire with 'quick start' spray direct into intake of carb. It sometimes backfires out of the carb throat with a "puff" and one time it actually ignited out the carb throat. (grabbed the extinguisher after that one) Nothing coming out of the exhaust. There is good suction at the carb throat with my hand over it. There is pressure out of the exhust.
I pulled the carb and I could hear the float rattling around in there. It looks largely clean inside, but I did not pull it apart. From what I guess, is that even if the needle or jets were plugged it would still flutter and put put put a bit with quik spray @ the carb throat..(right?)
With carb off (and on), there's good suction @ the intake manifold.
I had it cranking so much that I got up to 60 PSI oil pressure. I checked the cylinder pressure and all 4 range from 80 to 90 psi.
I've pulled all 4 plugs and did a spark test against the block. I get good spark from the plugs, mostly blue spark.
When cranking the engine with the cap off distributor, there's a arching blue spark between the points. Is this normal? If I'm getting spark at the plugs, does that rule out electrical? If I pull the points apart and let them go together there is spark there.
I put some gas in the cylinders and tried to crank, and I can't say for sure if it was actual cylinder detonation, or backfire out the carb it happened so fast and my "syringe" that I was using to get the gas in there melted so I couldn't do it again. I need a turkey baster.
At this point, I really don't know where to turn. Spark, oil pressure, cyl pressure, and fuel.....what am I not seeing? (esp since this machine was in prefect order in October and now it's a nightmare)
Will quick start spray into carb fire the engine if everything else is in good order? Is this electrical or fuel related?
I'm beside myself on this one.....It's ruining my sleep!
Help appreciated.[url][/url]
This post was edited by Dan G at 15:43:17 04/14/10.
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