High screw almost in but still rich

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I m thinking if it doesn't seal around the valve or the diaphragm in the valve is stuck..
Never seen one leak around the nozzle valve and the diaphragm is supposed to be fully open for high speed operation. Have you ever checked the inlet valve pop-off pressure to make sure inlet valve isn't leaking?
 
Never seen one leak around the nozzle valve and the diaphragm is supposed to be fully open for high speed operation. Have you ever checked the inlet valve pop-off pressure to make sure inlet valve isn't leaking?
Its my next job to do. Checked only blow not suck air. If it doesn't work how can i fix it? Cut an old diaphragm and put it in?
 
Hello to everyone! I have a jonsered 670 champ. I m trying to find the reason it is running rich even with the high screw in. The saw has new meteor piston, new fuel lines, new muffler, new diaphragms. Tillotson hs series. Service manual says welch plug or nozzle valve leaking. This has not a welch plug but a main nozzle valve. I have to test if it works well and if it seals. Any suggestions ?
Worth noting if that welch plug over the idle drillings is leaking that will cause it to run rich too.

Are you at high elevations?
 
Clean it with soapy water
Nice try! The soap will do a good job of removing the 2-cycle spitback oil. However, what does water do to wood fibers? It causes them to swell locking them into the filter!

Put the filter in a warm, dry place like and oven at low temperature for a few days to throughly dry out the wood fibers embedded in the filter. Once the filter and the debris that it contains is completely dry get some non-chlorinated brake cleaner and spray the filter directly with the stray from the inside out. This should remove most of the sawdust. After the brake cleaner dries hold the filter up to the sun or other bright light source and look for light through the filter. Light is good pinholes are not. Pinholes means that it is time to replace the filter with an OEM unit.

Here are some photos of a Stihl 026 air filter

IMG_1733.JPG
As Found!

IMG_1746.JPG
Light test


IMG_1795.JPG
After brake cleaner. All you see is the manila colored filter material.

Please post some photos of your filter.
 
Nice try! The soap will do a good job of removing the 2-cycle spitback oil. However, what does water do to wood fibers? It causes them to swell locking them into the filter!

Put the filter in a warm, dry place like and oven at low temperature for a few days to throughly dry out the wood fibers embedded in the filter. Once the filter and the debris that it contains is completely dry get some non-chlorinated brake cleaner and spray the filter directly with the stray from the inside out. This should remove most of the sawdust. After the brake cleaner dries hold the filter up to the sun or other bright light source and look for light through the filter. Light is good pinholes are not. Pinholes means that it is time to replace the filter with an OEM unit.

Here are some photos of a Stihl 026 air filter

View attachment 1237677
As Found!

View attachment 1237678
Light test


View attachment 1237679
After brake cleaner. All you see is the manila colored filter material.

Please post some photos of your filter.
Carb cleaner is ok? I will do it tomorrow!!
 
Cant wait, fotos are coming
Did the job with cab cleaner. There is big difference in deed. I will test the saw tomorrow and tell you the results
 

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