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I have a Stihl FS36 trimmer. Trying to check why does not…

I have a Stihl...

I have a Stihl FS36 trimmer. Trying to check why does not start. I have spark. Cleaned carby real good. Carby is WT 1608. Want to check the needle valve works OK by blowing through a hose. Saw this test being done on U Tube for a Zama ... different set up. Can I check it same way? Connected a hose to inlet but cannot blow through when depressing metal lever that raises needle valve. How do I check needle valve is working right?

Mechanic's Assistant: Do you have fuel in the tank? If so, is the shut-off valve open and the fuel clean?

I have carby off. Stihl had fuel ... does not have a shut off valve.

Mechanic's Assistant: Do you plan on doing the work yourself?

Yes

Mechanic's Assistant: Anything else we should know to help you best?

My Stihl dealer says no parts for this very old trimmer so just buy a new one. I have taken it apart, cleaned everything, all carby gaskets etc good. It is a WALBRO WT 1608.

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Answered in 1 minute by:
11/21/2017
Donald
Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 2,603
Experience: I have 25+ years of experience repairing 2 & 4 cycle engines
Verified

Hello. Thank you for choosing Just Answer. My name is***** will be happy to assist you.

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If you have some carburetor cleaner in a can, spray a small burst directly into your carburetor, to see if your engine will start up and run briefly.

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We can continue from here.

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Customer reply replied 9 months ago
Done all that, by the way I am in Australia so no live phone. Happy to type.
Customer reply replied 9 months ago
do not want to call

No problem. The phone call is an option for customers who rather not type.

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Are you saying that the carburetor cleaner will not cause your engine to start briefly?

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Customer reply replied 9 months ago
Have not tried that ... will have to reassemble carby/trimmer to try. Do you just remove filter, open throttle and spray?
Customer reply replied 9 months ago
my initial question was how do I check needle valve is operating correctly?

Are you referring to the needle valve in your carburetor. If so, I can attach a video for you.

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Ask Your Own Small Engine Question

To check your needle valve, to see if it is working properly, you will need a pressure gauge.

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Customer reply replied 9 months ago
Oh! OK. I guess I will just hope valve is working right as do not have a gauge. Will try the carby cleaner once I have reassembled. I assume if I cannot get it to start briefly then it must be a spark problem as compression is good. I have a 2nd hand ignition coil coming via ebay just in case.Another question ... the plate that covers the needle valve has a hole in it ... assume is a drain ... need to know positioning of plate re hole ... does it matter. Cannot find a picture online of a FS36 showing the plate/hole position. Does it matter?

The hole should face down after your carburetor has been installed. Also, your compression needs to be 100 psi or higher.

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Customer reply replied 9 months ago
Thanks ... that makes sense. Will check compression is 100psi plus. Re carby cleaner to see if engine will start ... do I just remove filter, open throttle and spray into carby throat?

Yes, you are correct. Just spray a small burst directly into your carburetor. When you have an opportunity, take a look at the Wabro video in the link above.

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Ask Your Own Small Engine Question

Thank you again for choosing Just Answer. If you need additional assistance, please feel free to let me know, and I will be happy to continue working with you, until our problem is resolved. There is a link in your email that you can click on, if or when you need to return to our discussion page.

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Donald
Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 2,603
Experience: I have 25+ years of experience repairing 2 & 4 cycle engines
Verified
Donald and 87 other Small Engine Specialists are ready to help you
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Customer reply replied 9 months ago
Thanks for help. I think my trimmer may be too old to fix (10yrs at least) but will try a bit longer. Will sign off now and rate you. Link in email works so may come back.

Absolutely. Give it a try, before giving up. Let's hope you get your engine up and running again. Thanks for the positive rating.

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