force 125 compression specs/ rough idle

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findinghomer

Petty Officer 1st Class
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Nov 7, 2009
Messages
271
well my engine some times idles very roughs and shuts off. i wanted to rule out compression so i ran test. all cylinders were 126-130. however in my clymer manual it says should be 140-160 psi. is this a sign of engine problems?

now on to the rough idle, i believe its a carb problem? bowl is overflowing with fuel after it runs a few minutes, also my spark plugs were fouled wet, and black. it seems im running really rich. will carb rebuild fix this? if so what all should i replace? thanx in advance
 
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jaybirddog11

Petty Officer 2nd Class
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Nov 30, 2009
Messages
133
Re: force 125 compression specs/ rough idle

I have almost the exact same issues and compression, wet fouled plugs and black (1979 100hp chrysler). I have just replaced my fuel pump diaphragm and have not yet tested but I was told that it could be the problem. I believe your compression is fine. It could improve if you do a decarb. I will be doing this next time out. With regards to your carb issues , I would consider replacing the floats, needle and seats and all gaskets and thoroughly clean everything.
 
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findinghomer

Petty Officer 1st Class
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Nov 7, 2009
Messages
271
Re: force 125 compression specs/ rough idle

awesome , thanx jbird. im goin to get diaphram, and carb parts, but what exactly is decarb? how does it help compression?


ps. i found and ordered , needle, seat, and diaphram, but cannot find the float, the one here doesn list my motor as fitting. its an 89 125 hp. if you or anyone knows where i can find that please let me know, thanx.
 
F

findinghomer

Petty Officer 1st Class
Joined
Nov 7, 2009
Messages
271
Re: force 125 compression specs/ rough idle

ummm quick question, how do you remove the needle? the seat looks to be pressed into the body?
 
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