Honda GX160

You've got to be getting close to getting this mystery solved!

Intake 0.15 + or - 0.02 mm

Exhaust 0.20 + or - 0.02 mm
 
Even after re-cleaning the carb several times, have you checked the FLOW of gas with the carb bowl off and using your finger to raise and lower the float? I've seen other engines start fine because gas will come down through the fuel system and fill up the float bowl very slowly. Then when you start it it has just enough gas to throttle up, but then burns it all and starts sputtering and coughing and stumbling as yours is. Sounds like a "Fuel Starvation" problem to me. Check for good fuel flow from the tank, filter, lines, and where it goes into the carburetor. Maybe a tiny piece of foreign matter is causing the lack of fuel flow? Perhaps some varnish over the fuel inlet filter screen in the carburetor? Hope this helps. Dave
 
DaveTN said:
Even after re-cleaning the carb several times, have you checked the FLOW of gas with the carb bowl off and using your finger to raise and lower the float? I've seen other engines start fine because gas will come down through the fuel system and fill up the float bowl very slowly. Then when you start it it has just enough gas to throttle up, but then burns it all and starts sputtering and coughing and stumbling as yours is. Sounds like a "Fuel Starvation" problem to me. Check for good fuel flow from the tank, filter, lines, and where it goes into the carburetor. Maybe a tiny piece of foreign matter is causing the lack of fuel flow? Perhaps some varnish over the fuel inlet filter screen in the carburetor? Hope this helps. Dave
Click to expand...
Hi Dave
Thanks for that suggestion,never considered the fuel flow.I will try that today.Just to clarify the valve clearance settings,is it 0.006 inch I/L and 0.008 inch O/L ?
Phil
 
philrose said:
Hi Dave
Thanks for that suggestion,never considered the fuel flow.I will try that today.Just to clarify the valve clearance settings,is it 0.006 inch I/L and 0.008 inch O/L ?
Phil
Click to expand...

Intake is 0.006 (+ or - 0.001 inches)
Exhaust is 0.008 (+ or - 0.001 inches)

Checking the fuel flow is a good idea too. Hadn't thought if it either. Take a look to see if there's something inside the fuel tank blocking the filter inside it.
 
bwdbrn1 said:
Intake is 0.006 (+ or - 0.001 inches)
Exhaust is 0.008 (+ or - 0.001 inches)

Checking the fuel flow is a good idea too. Hadn't thought if it either. Take a look to see if there's something inside the fuel tank blocking the filter inside it.
Click to expand...

Thought I'd post these specs for Honda Engines.

Honda Small Engine Intake & Exhaust Valve Clearances

Model Series

Intake Valve Clearance

Exhaust Valve Clearance



GX640

0.10-0.14mm ( 0.004-0.006in )

0.18-0.22mm ( 0.007-0.009in )



GX100

0.15 +/- 0.04mm

0.20 +/- 0.04mm



GX120

0.15 +/- 0.02mm ( 0.006 +/- 0.001in )

0.20 +/- 0.02mm ( 0.008 +/- 0.001in )



GX160

0.15 +/- 0.02mm ( 0.006 +/- 0.001in )

0.20 +/- 0.02 mm ( 0.008 +/- 0.001 in )



GX670

0.15 +/- 0.02mm ( 0.006 +/- 0.001in )

0.20 +/- 0.02mm ( 0.008 +/- 0.001in )



GXV120

0.15 +/- 0.02mm ( 0.006 +/- 0.001in )

0.20 +/- 0.02mm ( 0.008 +/- 0.001in )



GXV140

0.13 - 0.17

0.18-0.22



GXV160

0.15 +/- 0.02mm ( 0.006 +/- 0.001in )

0.20 +/- 0.02mm ( 0.008 +/- 0.001in )



GXV270

0.15 +/- 0.02mm ( 0.006 +/- 0.001in )

0.20 +/- 0.02mm ( 0.008 +/- 0.001in


GX360

0.12 +/- 0.02mm ( 0.005 +/- 0.001in )

0.20 +/- 0.02mm ( 0.0078 +/- 0.0008in )
 
He's talking about the emulsion tube. It's that part they poked out after taking the main jet out that has a bunch of holes along the sides.
 
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