HorseHead1089 99 #1 Posted March 7, 2015 i have clean the sediment bowl, blown the fuel line, and checked for flow, and blasted the carb and made sure it was tight, but the motor only runs with the choke nearly all the way down. i glanced quick with a google search and found it could be a head gasket? well that wouldent be much trouble because its a flathead. Any thing else i can check for? also motor feels a slight lack of compression when using the rope start, jut doesnt have that extra oomf at the top of the compression stroke. Share this post Link to post Share on other sites
WH nut 553 #2 Posted March 8, 2015 The first thing I would do is pull the carb a part again and run some small wire through all the passages. Pull the main jet out and make sure all the holes are clean. I doubt its a head gasket if its running Share this post Link to post Share on other sites
buckrancher 2,677 #3 Posted March 8, 2015 check the high speed needle it's hollow and has some small holes in the side I think two near the bottom and two near the top be sure you can blow air thru one end and out the other Brian Share this post Link to post Share on other sites
tunahead72 2,346 #4 Posted March 8, 2015 I think WH nut and Brian are right on, take care of the carb before you mess with anything else. When you say you "blasted the carb and made sure it was tight", did you just spray some carb cleaner into the carb and tighten the mounting bolts, or did you remove the whole thing and soak it? If removing and cleaning the main / high speed needle doesn't solve your problem, a thorough cleaning and a carb kit probably will. You might also have bad gaskets that are allowing unfiltered and unmetered air into the combustion chamber, I would replace those at the same time. And a couple of obvious things... Are you using fresh fuel? And is your choke control working properly (check it manually with the engine off, make sure the choke is opening and closing when it should)? Share this post Link to post Share on other sites
HorseHead1089 99 #6 Posted March 27, 2015 Yes very much progress. purred like a kitten and internals sound good. Now I hope to be in the proscess of an 8 speed swap. And adding a starter generator. I made another topic in that regard if you have any info to post there it would helpful. Share this post Link to post Share on other sites
tunahead72 2,346 #7 Posted March 28, 2015 So, what did you do to make it run better? Share this post Link to post Share on other sites
HorseHead1089 99 #8 Posted March 28, 2015 The bottom part where the fuel is picked up in the bowl, the cast part of the carburetor had two holes in it, and i didn't even see them because they were severely gummed up.also a carb rebuild helped, as well as cleaning out the sediment bowl assembly. 1 Share this post Link to post Share on other sites
