Echo Zama Carburetor Hidden Hi Jet Screw




What do you think about this video?

BADFISHHHHHH: this helped me so much. I saw this explained on a forum and had to try and find it on youtube. My sr-225 was bogging down at WOT and backed that screw out a full turn and and worked awesome. just like new

Greg Wilhite: Thank you

privatear2001: I have an SRM-210 that runs like crap. Interestingly enough, it has the high speed needle as well, and though it is hidden, it had no limiter cap. But it uses a small Allen wrench to adjust it.. like a 1 mm. Seeing this video, I'll pop it out soon and have a look at the end of the needle and see if its clogged. It would be great if this solved the problem.

Does anyone know the adjustment procedure for this needle, btw? A lot of times, with high and low speed pins, you have to seat it and then back it off maybe 1.5 turns and then adjust 1/4 turn up or down. I would like to know the exact procedure for this carb.

Also, does anyone run engineered fuel or non-ethanol-based gas in these things? I've been running engineered fuel for the last year and it really improves performance, especially in chain saws. Very expensive, but worth it to run though, especially if its your last tank of gas for the year before you put the thing in storage. I believe the corn ethanol in the gas clogs the carburetors as well as eats the rubber hoses. I've replaced umpteen rubber hoses in mine and friend's equipment. I've taken apart a bunch of carbs and found the jets gummed up with varnish. One saw I had, the hose completely disintegrated inside the tank. No hose left at all. I replaced the hose and filter, ran engineered fuel through it, ran like a charm. Put mixed high octane gas through it, ran like garbage again. Then stuck with the engineered fuel. A mixture of the two seems to work, as well. Just not ethanol based fuel.

I came across a website devoted to showing where all the non-ethanol based gas stations exist throughout the country. Interestingly enough, the States who most wanted ethanol-based fuel (to supplement corn sales, perhaps?) seem to have the largest number of non-ethanol gas stations. Illinois for instance, has quite a few. And that gas is maybe 10 cents more a gallon than its ethanol-based counterpart. While here in MA, we have none, so are forced to buy engineered fuel which is about 7X the price per gallon. Mighty interesting! :) Can you say "Highway robbery"? :)

riphaven: thank you for posting this. also another idea to get the jet is to heat up a drywall screw with a lighter having the screw on the end of a shorty phillips head screw driver and turn it into the plastic, wait about a minute for the plastic to harden again and pull it out with pliers. i say use a shorty screw driver because you get better control.

Kenneth Oneal: btw I didn't clean the carb/jets. I just turned the screw out 1/2 turn. thanks again

Kenneth Oneal: my edger has ran like crap from day one. I took it to the shop 2 times, both times it ran as bad as it did when I took it. I gave up on it, and didn't use it at all last year. after watching this video I did what you said, and FINALLY it runs and runs good. I'm so thankful for your video.

Tommyr: Thanks for making this video.

Terry Taylor: I have the Echo srm-225 liner trimmer. At first it would start, first pull, but bog down and die at wot. I tried a simple cleaning, no change. Then I tried this procedure of cleaning the "Hi-jet screw", or needle. After completing this and re-assembling the carb and air cleaner, it will not start. I've repeated the process, tried adjusting the needle, from completely tight, to backing out 1/4 turn at a time, all the way to 3 full turns, nothing. I sprayed a small amount of carb cleaner on the air filter and it fired for a few seconds. The primer bulb fills and is full, with fresh fuel. Yes, the run switch is in the run position. :-) Any thoughts?

Trent Cooper: great video, was spot on and solved the problem in no time. Thank you for posting, saved me money and time thanks.

jim s: ok guys , I'm eating crowe. the replacement carb I ordered is bad, won't rev past idle. this fix works. don't have fumble fingers, it's very small. I too had to use a wire off a brush cup. saved my bacon on this repair
Thanks DW 6

jim s: I tried your method and it will come apart and come out as you show. Cleaning the small brass jet is a huge pain. You better have great eyesight!!!!! Good hands too cause it's way way small. I have an Echo SRM 210 for repair. I wouldn't even consider putting this on a customers not even mine , replacement carburetors are so cheap online that doesn't make any sense to even try to repair one but it was a good video and much appreciated.

Mike Hambuchen: mine is a SRM 230. I got the carb apart to see the brass insert, but no plastic and no screw. So i took a 5/32 drill bit and started gently drilling that brass insert. Soon after I drilled below the carb block, a piece of plastic and the remains of the brass came out exposing the jet screw. It was not plugged up so i set the screw back 1/2 turn after hitting bottom, maybe should have only gone 1/4. In anycase it now runs, only a little bogged down at full throttle, running at full speed before I get there (that is why I thought maybe a 1/4 turn would have been enough). THANKS!

David Chambers: Thax, My problem they are making them harder to get too. Not just Echo. If I can't adjust the carb then I don't need it!

Tana Parks: Your teaching people wrong

Tana Parks: The plastic you drilled out is called a limiter cap which is extracted with a 2.5 mm limiter cap tool thats left hand threaded into it. You really shouldnt be telling people to drill those out due to risk of damage and as a 2016 licenced tech for Echo and Shindaiwa i can tell you if you try any adjustments to carb with knowing proper specs it is possible to lean out carb and make your engine fail and if under warranty you will void it. My advice, speak with your local shop that is a dealer about simple adjustments. also the adjustment screws are not hidden and i dont know who told you that zama carburetors are best replaced i always pressure test and vac test them if they pass then why replace. But one thing you missed on here, if carburetor starts to bog or starting issues or even runs on choke. 99 percent of the time most carburetor failures are due to either poor maintanice or stale fuel. if adjustment are made at home always remember before adjusting expect air filter for possible restrictions like dirt, expect fuel line for small holes or weak lines a good line should collapse by squezing it down and return no problem is soft or weak, its time for replacment. fuel filter is best replaced every 3 months expect to make sure not plugged up. Remember i am trained and speaking to you like my teacher spoke to me.

Tana Parks: The plastic you drilled out is called a limiter cap which is extracted with a 2.5 mm limiter cap tool thats left hand threaded into it. You really shouldnt be telling people to drill those out due to risk of damage and as a 2016 licenced tech for Echo and Shindaiwa i can tell you if you try any adjustments to carb with knowing proper specs it is possible to lean out carb and make your engine fail and if under warranty you will void it. My advice, speak with your local shop that is a dealer about simple adjustments. also the adjustment screws are not hidden and i dont know who told you that zama carburetors are best replaced i always pressure test and vac test them if they pass then why replace. But one thing you missed on here, if carburetor starts to bog or starting issues or even runs on choke. 99 percent of the time most carburetor failures are due to either poor maintanice or stale fuel. if adjustment are made at home always remember before adjusting expect air filter for possible restrictions like dirt, expect fuel line for small holes or weak lines a good line should collapse by squezing it down and return no problem is soft or weak, its time for replacment. fuel filter is best replaced every 3 months expect to make sure not plugged up. Remember i am trained and speaking to you like my teacher spoke to me.

grasscutter88: Use a 7/64'' bit and slowly drill it and it should grab the plastic plug out. Just don't drill too far, you don't have to take apart anything on the carb like he's doing, but you need a small flat head screw driver for eye glasses.

Rick Reid: Thanks for the great video. Very helpful!

David Evans: Garbage bag ties work great, but I have a torch tip cleaner at my shop and several pcs of wire, also guitar strings too.

Adam Moulton: THANK YOU VERY MUCH.
I DID EXACTLY WHAT YOU SAID AND IT FIRE RIGHT UP.
YOU ARE THE MAN

Rating:
Echo Zama Carburetor hidden Hi jet screw 5 out of 5

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Echo Zama Carburetor hidden Hi jet screw