Seized Honda GX 390

[dirttoys]

Pull the head (I think it is just 4 bolts), and that should remove all the mystery Can't hurt anything.

best,

ed

 

[Red Horse]

Is the piston going up and down as your turn the crankshaft ?

No clue- I was just turning from nut on assembly that recoil connects to. I guess I will pull the head in next day or so. I did do a You /tube search and came across a guy that bought "Sten" brand complete head assembly with valves for $105

 

[dirttoys]

No clue- I was just turning from nut on assembly that recoil connects to. I guess I will pull the head in next day or so. I did do a You /tube search and came across a guy that bought "Sten" brand complete head assembly with valves for $105

Don't buy anything until you pull it, please let us know what you see.

Best,

ed

 

[Red Horse]

Don't buy anything until you pull it, please let us know what you see.

Best,

ed

For sure!

 

[Red Horse]

Is the piston going up and down as your turn the crankshaft ?

Yes-latest thing I did-pulled plug and confirmed-piston is functioning as it should.

 

[Richard001]

OK then, it's time to disassemble the engine and see what the problem is. As someone else said, start with taking off the head and see what you see.

 

[Red Horse]

OK then, it's time to disassemble the engine and see what the problem is. As someone else said, start with taking off the head and see what you see.

for sure-next step

 

[Grumpycat]

Well guys an update. I pulled plug and shot some WD in it and then took recoil off and put a socket on crank. Should have done that first. Turned easy as can be-for bout 270 degrees. then I pulled valve cover. One rocker moving as it should while no movement on other-other then the rocker arm was very loose-no tension either way.

So lobe came off cam? valve broke and that is why wont go past 270? And I say 270-Plus or minus like 3/4 rottion and it jams???

Rotate the engine 2 full revolutions watching the valves before you pass judgement. The camshaft turns 1 revolution for 2 of the crank.

 

[Red Horse]

Rotate the engine 2 full revolutions watching the valves before you pass judgement. The camshaft turns 1 revolution for 2 of the crank.

GC- only rotates about 270 degrees! then stops

 

[BleedingOrange]

My guess would be you have a broken rod.