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FS400 Ring gap

#1

C

cherami

Does anyone know the ring gap for this motor, to ascertain wear please.


#2

H

hlw49

What is an FS400 Kawasaki? If so they don't list an FS400 engine. They list a FE400 but no specks for the ring gap.


#3

C

cherami

FS 400 is a Stihl strimmer


#4

StarTech

StarTech

The FS400 service manual has no specs on the ring end gap nor landing clearances.


#5

Hammermechanicman

Hammermechanicman

Most handheld 2 strokes have locating pins in the in the grooves to keep the rings from turning to where a ring end is in a port (bad). And the ends are tapered to fit the pins. I have never had to file rings. OEM or AM I just put new rings on the piston and install. Never had a problem. Not sure if the FS400 uses a plated cylinder but if it is not scored it is probably good to go.


#6

StarTech

StarTech

And FS400 is no exception
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#7

C

cherami

Hammermechanicman said:
Most handheld 2 strokes have locating pins in the in the grooves to keep the rings from turning to where a ring end is in a port (bad). And the ends are tapered to fit the pins. I have never had to file rings. OEM or AM I just put new rings on the piston and install. Never had a problem. Not sure if the FS400 uses a plated cylinder but if it is not scored it is probably good to go.
Click to expand...
There is wear on the cylinder but without knowing ring clearance it is impossible to ascertain how much wear on cylinder or rings.


#8

C

cherami

I am not being informed if there are replies to my post, even though I have notification on. Is this normal?


#9

Tiger Small Engine

Tiger Small Engine

cherami said:
I am not being informed if there are replies to my post, even though I have notification on. Is this normal?
Click to expand...
Take the old rings after removing from the piston, push down into the cylinder with the piston to make even. Take your feeler gauge and determine gap. Repeat process with new rings. This will give you a comparison at least.


#10

H

hlw49

cherami said:
FS 400 is a Stihl strimmer
Click to expand...
My bad


#11

Hammermechanicman

Hammermechanicman

If the cylinder is worn not much you can do other than new cylinder. May not be worth all the detective work as a P&C kit is only $35


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