TravelinJavelin 620 #1 Posted May 16, 2014 this engine won't run for crap for some reason tried 5 different carbs has compression of 100lbs has new points condenser and coil good spark fuel is flowing from tank very well, so here's what I don't understand now when it runs it just idles only the minute you try to give it throttle it dies then you bring it back to idle then will run for a minute then dies out or will try to catch itself and almost like backfires through carbuerator or wants to like run backwards for before quiting, when you pull the plug out to inspect its black and carboned up not wet at all which puzzles me? Share this post Link to post Share on other sites
joel_400 59 #2 Posted May 16, 2014 Are the carbs known good carbs? Is the fuel cap venting? Just some thoughts. Have you tried adjusting the carbs? Condenser is hooked to the negative side of the coil? Hope you get it fugured out. Joel Share this post Link to post Share on other sites
squonk 39,135 #3 Posted May 16, 2014 Just for the heck of it I would run a wire directly to the positive side of the coil to the battery or at least connect a voltmeter and see if your losing 12v to the coil. I had a tractor that did this and the vibration while the engine was running caused a bad connection intermittently dropping out the battery power to the coil. It would die,backfire,black smoke,fouled plug ect. Once I found the bad connection. It ran like a champ. You trying five different carbs with the same result leads me to believe it's not fuel. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,540 #4 Posted May 16, 2014 I've seen a bad condenser do that and drove me nuts after having just replaced it with the points. New ones can be defective. Garry Share this post Link to post Share on other sites
TravelinJavelin 620 #5 Posted May 16, 2014 yeah I tried a carter just bought one of the Chinese knock offs and several others that came off good running motors more or less the same results with the carbs I've seen leaking seals act simaler to this but usually would run great til warmed up and die out until cooled off sometimes you swear that it was off time the way it trys to catch itself then almost backfires through th carb and literally will turn it over backwards Share this post Link to post Share on other sites
TravelinJavelin 620 #6 Posted May 16, 2014 is there a way to test a condenser? I know when I pull the plug out to check fire its just as bright blue as can be Share this post Link to post Share on other sites
Kelly 1,028 #7 Posted May 16, 2014 Change the condenser, had the same thing happen to me a few times, also be sure it's hooked to the neg side of the coil. Share this post Link to post Share on other sites
TravelinJavelin 620 #8 Posted May 16, 2014 (edited) yup just confirmed all that and will change the condenser would like to thank everyone's help on here Edited May 16, 2014 by TravelinJavelin Share this post Link to post Share on other sites
TravelinJavelin 620 #9 Posted May 16, 2014 well got the problem solved and I guess I should of paid more attention but all it was the wire that goes to the coil was on positive instead og the negative side, switched that around and man it just sat there idling and throttled up perfect, thank you very much for the help I do appreciate it Share this post Link to post Share on other sites
slammer302 2,154 #10 Posted May 17, 2014 Just went through the exact same thing it was the points bring them in just a little took care of it for me Share this post Link to post Share on other sites
slammer302 2,154 #11 Posted May 17, 2014 I changed my carb 3 times I almost gave up then when it was idling I put my screw drive against the points and it started to run good when I pulled the screw driver off it went back to running like crap so I righted up the points gap and ur runs great know Share this post Link to post Share on other sites
TravelinJavelin 620 #12 Posted May 17, 2014 amazing how something so simple will get the best of you sometimes Share this post Link to post Share on other sites
