ANewSawyer
Addicted to ArboristSite
See post #25 and all will be explained!
Been working on the carb for this new to me Shindaiwa S-25 (AKA T-25) weedeater down in handheld equipment. I finished a soak and rebuild on the carb. I have put the carb back together and bolted it back in place. I can prime the carb and the weedeather will cough when the choke is fully on. It only takes one or two pulls. I back the choke off a little and will start, run for about 2 seconds. Then it dies. I can pull starter rope again right away and it will repeat. Choke settings doesn't seem to make a difference except that it hasn't started at all with the choke open. The gas came with the weedeater but it is stabilized, good gas. The guy who had this Shindaiwa before me rebuild two cycle engines for a living.
You should know that this is a TK carb. The choke and the throttle are completely separate. As per the starting instructions, I have the throttle locked open. When I had the carb on the bench, I tried to seat both jets. I turned them in until they wouldn't turn any more without a lot of force. Then I backed them out to the factory settings. I tried to reset the meter lever height but I found I didn't have an accurate way to measure it. It may or may not be off. I got it as close as I could. I shows wear and will be replaced later.
There are a couple of things I can think of:
1: Operator error when starting. I doubt this because I am following what is written in the owners manual. But there might be something I don't know about starting.
2: The hi/low jet screws are at the wrong setting. I realize that the factory setting are a guide line but I would think a newly rebuilt carb should at least start and run a little at factory settings.
3: I installed the pump diaphram and gasket in reverse order. Not likely but worth checking.
4: The in tank fuel line has a hair line crack that is sucking air. Quickest way I know of to test this is to fill the tank. I will have to mix some new fuel and check this. Or I could use the 32:1 fuel I already have.
5: Tank breather is clogged. If the weedeater started, died and then wouldn't start until the gas cap was opened, I would look at this in depth. I will probably replace the breather but I don't think it is causing my current problem.
6: Would be a pressure test but I don't have a pressure tester. I have read on here that I can test this by removing the spark plug and putting my thumb over hole. If it has good compression, it should pop my thumb off the hole.
Been working on the carb for this new to me Shindaiwa S-25 (AKA T-25) weedeater down in handheld equipment. I finished a soak and rebuild on the carb. I have put the carb back together and bolted it back in place. I can prime the carb and the weedeather will cough when the choke is fully on. It only takes one or two pulls. I back the choke off a little and will start, run for about 2 seconds. Then it dies. I can pull starter rope again right away and it will repeat. Choke settings doesn't seem to make a difference except that it hasn't started at all with the choke open. The gas came with the weedeater but it is stabilized, good gas. The guy who had this Shindaiwa before me rebuild two cycle engines for a living.
You should know that this is a TK carb. The choke and the throttle are completely separate. As per the starting instructions, I have the throttle locked open. When I had the carb on the bench, I tried to seat both jets. I turned them in until they wouldn't turn any more without a lot of force. Then I backed them out to the factory settings. I tried to reset the meter lever height but I found I didn't have an accurate way to measure it. It may or may not be off. I got it as close as I could. I shows wear and will be replaced later.
There are a couple of things I can think of:
1: Operator error when starting. I doubt this because I am following what is written in the owners manual. But there might be something I don't know about starting.
2: The hi/low jet screws are at the wrong setting. I realize that the factory setting are a guide line but I would think a newly rebuilt carb should at least start and run a little at factory settings.
3: I installed the pump diaphram and gasket in reverse order. Not likely but worth checking.
4: The in tank fuel line has a hair line crack that is sucking air. Quickest way I know of to test this is to fill the tank. I will have to mix some new fuel and check this. Or I could use the 32:1 fuel I already have.
5: Tank breather is clogged. If the weedeater started, died and then wouldn't start until the gas cap was opened, I would look at this in depth. I will probably replace the breather but I don't think it is causing my current problem.
6: Would be a pressure test but I don't have a pressure tester. I have read on here that I can test this by removing the spark plug and putting my thumb over hole. If it has good compression, it should pop my thumb off the hole.