CountryRock 199 #1 Posted June 6, 2019 I'm working on a mid 90s Craftsman push mower with a 6.5hp Briggs Quantum engine. Is has a non-adjustable LMS type carburetor on it. It ran a little rough, so I took the carb apart, cleaned it and rebuilt it. Everything got blasted with carb cleaner and air when it was apart. I put it all back together and now it won't run unless I squirt gas into the intake. Bowl has gas in it. What am I missing? Share this post Link to post Share on other sites
Guest 88vic #2 Posted June 6, 2019 Get a new carb on ebay or Amazon, they are only about $15. Throw it on and forget about it. If not, the main jet in carb still needs cleaned out, also the little nut that holds the bowl on has small holes, those may be plugged up as well. Make sure the carb vents are clean too. Share this post Link to post Share on other sites
CountryRock 199 #3 Posted June 6, 2019 The bowl nut is the main jet and it's clean. Share this post Link to post Share on other sites
JoeM 7,873 #4 Posted June 6, 2019 You have to stick small wires, like a torch tip cleaner, tag wire, or even a stripped bread tie up through those main jet holes. I have done the same in the past with cleaner and air but had to loosen crud with a wire to get the best effect. Ethanol Pearls! Share this post Link to post Share on other sites
CountryRock 199 #5 Posted June 6, 2019 6 hours ago, OILUJ52 said: You have to stick small wires, like a torch tip cleaner, tag wire, or even a stripped bread tie up through those main jet holes. I have done the same in the past with cleaner and air but had to loosen crud with a wire to get the best effect. Ethanol Pearls! I did all that. They are all clean. Share this post Link to post Share on other sites
WHNJ701 4,165 #6 Posted June 6, 2019 turn the fuel shut off to the on position Share this post Link to post Share on other sites
tunahead72 2,412 #7 Posted June 6, 2019 Did you replace the fuel line? Check the tank outlet? Will it keep running after you spray gas into the intake, or does it die? Share this post Link to post Share on other sites
Guest 88vic #8 Posted June 6, 2019 Did you take the welch plug out of the carb ? Ethanol pearls like to plug up that passage way. Share this post Link to post Share on other sites
CountryRock 199 #9 Posted June 8, 2019 (edited) Ok. Here's an update. Fuel lines are new, fuel valve is on. I took the carb back apart and blasted everything again. Put it back together, new primer, new gov spring. The carb primes fine. Plug is wet, I dried it. There is spark. I have no idea why it won't pop. I did try starting it without the blade earlier in the week, it was hard as hell to pull. Could there possibly be a partially sheared flywheel key? It only fires if I squirt fuel way into the intake and then only runs a few seconds and dies. Edited June 8, 2019 by CountryRock Share this post Link to post Share on other sites
WHNJ701 4,165 #10 Posted June 8, 2019 yes check the flywheel key. I had a cracked key on a horizontal, sometimes it ran sometimes it didn't. it had a hairline crack, changed it and it was fine. recently I picked a free snapper hi vac with a briggs, same thing it run on fluid, it was missing the the rubber breather hose, 4 dollars later I have a good running push mower check your kill switch wire make sure it's not grounding out Share this post Link to post Share on other sites
CountryRock 199 #11 Posted June 8, 2019 I took the top cover off and took the flywheel nut off. The key doesn't look sheared at all. I have a puller and keys coming, but now I'm not sure that that is the issue. I am absolutely stumped on this engine. Share this post Link to post Share on other sites
CountryRock 199 #12 Posted June 11, 2019 Ended up getting a cheap china carb for it. Works fine now. Share this post Link to post Share on other sites
