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Post by grandpashomelite on Sept 14, 2011 21:26:51 GMT -5
My old 360 has started to run out of fuel in the carb, fuel line and filter are new, kit has been installed. Saw will run great for a short time then die, once warm it will start right up and run for a while then die. Looking down the carb while running, I can see the fuel stop then saw dies, then if saw is hot, tank pressure will push fuel down the carb bbl. Anyone have any ideas, I have been through everything I can think of. Any help would be much appreciated. John.javascript:add("%20>  ") |
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Post by tribulation138 on Sept 15, 2011 5:19:56 GMT -5
did you reset carb needles and go from there
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Post by cwind on Sept 15, 2011 6:49:48 GMT -5
Have you checked the impulse line going to the carb or the carb boot? The carb boot probably is rotted out. This is a frequent problem with those saws.
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Post by powerking on Sept 18, 2011 8:32:10 GMT -5
Also, check the duckbill valve in the fuel cap. The old black ones turn to goo. The new ones are red in color and are made out of silicone rubber.
Tom (PK)
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Post by grandpashomelite on Sept 18, 2011 19:11:41 GMT -5
Thanks everyone for your suggestions, the impulse line was rotted at the crankcase. The intake boot seems to be okay, I can' see light through it anyway. Now the carb is getting plenty of fuel, but it won't fire now. I know the plug is good, but with this style of plug cap, I don't know how to test spark. Any Ideas? When I pull the plug after tugging on the rope for a while, it's wet with fuel. It doesn't look like it has fired at all. Thanks again.
John.
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Post by tribulation138 on Sept 18, 2011 21:16:36 GMT -5
unscrew plug. plug back into wire. touch threaded part of spark plug on muffler or any other metal part on saw. pull rope and you should see a bright blue spark hopefully. if you have spark. pull rope 8-10 times with spark plug out of engine. this will blow out any excess fuel foiling the spark. dry plug with rag. reinstall spark plug and try to fire up your saw.
whats the compression on your saw?
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Post by Brian VT on Sept 19, 2011 6:21:07 GMT -5
unscrew plug. plug back into wire. touch threaded part of spark plug on muffler or any other metal part on saw. pull rope and you should see a bright blue spark hopefully. Can't do that with the transformer-type plug connectors on these saws. He'll need to run jumper wires from the bolt holes to the transformer in order to perform the type of test you describe. |
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Post by MCS on Sept 19, 2011 8:44:39 GMT -5
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Post by cwind on Sept 21, 2011 6:29:08 GMT -5
You can check the spark by getting a small neon bulb from radio shack and holding the wires directly to the transformer. Have someone pul the saw over for you and it should light the bulb. You may have to be in a darker area to see this. You can get bulbs at Radio Shack. If you kit the carb double check to make sure you got everything together right. Make sure you have the needle lever set at the right height.
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Post by grandpashomelite on Sept 21, 2011 13:49:13 GMT -5
cwind- Do you know the proper needle lever setting? I've tried changing the setting without any difference.
Thanks again for all the help.
John.
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Post by cwind on Sept 21, 2011 16:43:39 GMT -5
There is a document on walbro's website that talks about this. I usually lay a small steel rule across the carb without the gaskets on it and set the lever so it is just barely not touching the rule. After doing this make sure that when you press the lever it unseats the needle. Usually works for me. When starting the saw is the throttle lock working properly?
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Post by MCS on Sept 21, 2011 16:54:59 GMT -5
In the earlier post you said the plug was wet. Does this mean it is dripping wet or just looks wet? Since it ran before you worked on the fuel system, it is more likely a fuel delivery issue and not spark.
I keep a pump oil can loaded with 2 cycle mix - it is a quick way to figure out if fuel is the problem.
Pull the plug and dry it with air. With the plug still out and choke off, pull the starter rope several time to purge the crankcase and cylinder of fuel.
Put things back together, give the carburetor a good stiff shot of fuel mix down the throat and then see if it will fire. It may not run long but as long as it sputters and runs a bit, that says there is spark.
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Post by grandpashomelite on Sept 22, 2011 13:28:54 GMT -5
cwind-thank you for the info, I will try it.
MCS-I have tried the fuel down the carb trick with no results.Thanks for the idea though.
New game-I aired out the cylinder, took off the impulse hose and got saw to start, as soon as I hook the impulse line back up, the saw floods and dies. I have adjusted the needle to where it barely opens. Bad needle? Thats my idea. Any thoughts?
Thanks again.
John.
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mirage
Dumpster Diver
is this fun or what
Posts: 21
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Post by mirage on Jun 21, 2021 17:19:59 GMT -5
Did you ever figure out what was wrong with your saw. I think I got the same problem
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