An engine oddity, Honda GX140

[BradenM]

This is what happens if I rev it a bit above governed speed, with a load.
I have since adjusted valve lash on the exhaust port and found the engine to be more responsive, it will now idle when hot, sounds better, and has a bit more balls on the bottom and top end.

Thoughts and suggestions welcome...maybe even an alternative explanation?


Braden.

 

[rubberducky]

Are you saying the push rod pushes the valve lever off the valve? I would try tightening the nut..?

 

[BradenM]

When it revs a bit higher then 4k, this is what used to happen. I first thought is was an error on my part, but have since adjusted valve lash a couple of thou. Engine now runs a lot better. Reason for posting this thread was for possible alternate theories, and so that if it happens to somebody else, there is a trouble shooting guide posted-it had me stumped.

 

[plankton]

thats why you have to remove the governor!

 

[Russ2251]

thats why you have to remove the governor!

What(?) is why you have to remove the governor?
Incidentally, valve lash has a spec and should not just simply be tightened. No matter if governed or not.

 

[BradenM]

Valve lash does have a spec, but the book containting that information will set me back $50. For now, it works, and I've been visited by police now. i can't drive it in my street, someone complained. So I don't want to spend that much more if it's not getting the use.

 

[jr dragster T]

.002" intake
.003" exhaust
Cold measurements. You dont need a book for it you could have just asked.

 

[BradenM]

Thanks tyler! I assumed that the GX140 would have had a different valve lash, but assuming makes an *** out of you and me!

cheers mate!

 

[jr dragster T]

Well some people like a even larger lash like .005"-.006". You should be good with what I told you.

 

[Kenny_McCormic]

I always set everything to 3 thou, playing with those paper thin gauges is a PITA.

 

[jr dragster T]

So how do you set it to 3 thou if you dislike feeler gauges?