Honda GX120 Troubleshooting Won't Start Issue

here we got a Honda GX 124 horsepower engine I picked this up to use as a project now we're going to get it running first and yesterday I had it running by dumping fuel in so we got to figure out why fuel is not going from the carburetor bowl inside the engine now the first thing we've got to do to troubleshoot there's few things you need to know to make the engine run which is the obvious you need fuel air ignition t2 confirmed what we got sparks I'm going to pull spark plug he bluffing so we're going to pull this plug out and we're going to test it I got the spark plug out and it's still wet from yesterday's troubleshooting so what we're going to do to test for spark is we're just going to rest it against any part of the body any metal part of the body where I can get a ground record spark so I'm going to hook up the drift camera and hopefully we can get a view now when I crank this over park in there so we know we have ignition while we have the spark plug it's good time to do a compression test now I don't have the exact figures but it should be about a hundred psi from a quick google search looks like compressions right around the 90 mark our compression test came back about 90 psi she saw the video that's a little on the low side I'm gonna have to get the exact numbers to confirm however a 90 psi it should still run now we got spark we got compression some people may say that you know you should do it on a warm engine and you should I don't think it's going to affect regions 10 psi and somebody might chime in say all you supposed to have to throw it all open but on this engine throttle is stuck open full time so now we got to confirm air and also a dirty air filter will also affect your compression as well but I already know the air filter is not the problem because you can see right here the air filter is still in pretty decent condition now in the carburetor flute bowl this bottom one holds your float on and this is like a drain right here so what I'm going to do is I'm going to pop open the drain we're going to drain some fuel out we're going to verify that indeed there's gasoline in there whoops as I'm making a mess and I open up the flow from the carburetor that's coming from the tank so we know we're getting flow I'm going to put this back in and then we're going to set this gas aside because we're going to use it in a bit so now I'm going to loosen the bottom I know it's kind of hard to see I'll try to get my fingers out of the way pull this float out the bottom of the float bowls pretty clean I was expected to be all covered with gum and varnish and the float still seems to move freely the needle still seems to move in and out so I got everything back together now and I'm going to try to start this thing and you're going to see it will not stay running do that again so we verified we've got spark we got combustion but somehow we don't have fuel delivery last week badly put in their nuts an obvious sign that something in the carburetor it's probably crystallized a gummed up varnish whatever from sit for an extended period of time so now I'm going to remove the carburetor I got some seafoam maybe we're going to soak in some seafoam for a while see what happens but let's strip it down and see what we can get out of this carburetor pulled off at most pincers right here they're going to pinch that line off I believe you only have to do is remove these two nuts on the side and then the whole assembly should just come out there is something attached to the top so I think we're going to have to remove this plastic piece first remove this piece up top disconnect the throttle and then pull it out start removing this one this one and this one and hopefully I get this top plate off I just drained all the gas off the float Bowl again make sure your switch is set to the off position now we're ready to remove these two screws and as we very carefully slide it off we will be able to get that throttle linkage out of there so let's get started on that I think that should be a number 10 mil as well yeah number 10 now we got this black rubber hose let's light that off and then you got to put this kind of in the middle positions and this should just slide right off like that so you see right here this is the choke and you can see inside there and this back ones your throught I don't know if you could see it operating in there I see my kid now we need to pull this off doesn't look too bad inside there yet there we go shut that off see see I can't get this off to get the gas line oh so then use this pincher hose pinch it hopefully they'll be hose pinchers hopefully I'll be enough to trap the fuel I guess there's one way to find out I already tightened it never mind I'm going to remove that little clip and pull the fuel line off fuel line off the hose pinch is working but I'm going to use a secondary one just to crimp the end just to make double sure that we're not going to come out the garage tomorrow the gasoline all over the place those carburetor should just come right off yep sure does all right let's just pull this pilot out but I got this thing soaking in seafoam hat soaking for a while but I'm pretty sure I've already found the problem let me just dig it out here culled this like a pilot jet or pilot leave it's just a pilot let me just clean that off and then I will show you okay let's just take this in the light here now besides for the glare you see that hole in the center that was all plugged up before so by soaking it and seafoam loosened it up I used some compress air right there use my blow nozzle blew it out I also blew inside here make sure nothing else was plugged up I think we're good to go seafoam is fixed today again I'm willing to bet money on it so let's reassemble this carburetor and then I guarantee you this thing will fire up all because some gum and varnish and who knows what else plug this pilot up I think I called it a pilot jet before I don't know what the proper term is pilot pilot jet somebody will correct me or maybe I'm wrong all together it's been a long time since I had a carburetor part it's probably been like 12 years carburetors are old school I don't really like them but anyways let's get this thing assembled I just got the fuel line put on and I got the throttle this spring was off the last time so I got the spring on there now we're just going to finish assembling this and then fire this bad boy did I fix it or is it a fail we are about to find out yeah I'm going to end the series right there in this video GX 120 we verified we got the engine to run we still got some problems low compression and now before I had a no fuel issue but now I have an over fueling issue so I'm gonna have to look into I don't believe there's any adjustments you could do to that float I didn't see any mixture screws maybe the pilot is just worn out and allowing too much fuel through anyways that's something I'm going to have to look into investigate further and we're going to tackle this in other videos anyways I'm going to get going if you guys have any questions or comments post them below otherwise thanks for watching

Channel: BSK Garage

Views: 367,136

Keywords: honda ohv engine, honda gx120, won't run, no fuel, check for spark, wont start, gummed up carb, plugged pilot, plugged main jet, carb rebuild, seafoam, honda gx120 won't start, honda gx120 isn't getting fuel, honda gx120 no spark, bad gas, Gasoline (Fuel), engine sitting

Id: 0-vMbAYY4yg

Length: 9min 56sec (596 seconds)

Published: Mon Nov 09 2015