This is just why there is so many engines and mowers are the junks piles across the world. If it can't be duct tape or JB welded they just buy a new mower.Hey man, it's just a lawn mower. Anybody can fix it. No real skillset required. LOL
Some of the newer carbs which I am assuming that Bert is talking about have a 3-1/2 to 4 turn starting point. Normally seen on the friction adjust screw carbs as opposed to the spring tension screws.I wonder how they think can adjust the idle speed with the engine stop. I never been able to do that.
Sometimes you just have use your best judgement on tuning from experience. The only OEM tuning guide that I have found that seems work is on the Echo equipment. All others seems to written by non techs. They got their grits and gravy together.
Anyway five turns seems to be excessive when the base tuning for Walbro carbs is 1-1/2 turns each.
Yes it is one of those newer EPA carbs with really fine threads , no springs and originally caps on both needlesSome of the newer carbs which I am assuming that Bert is talking about have a 3-1/2 to 4 turn starting point. Normally seen on the friction adjust screw carbs as opposed to the spring tension screws.
I have seen the needles the same length but different thread. I have seen them with the same thread, but different shape tip. And in some cases they are identical. Some of style carb use an O ring to create friction on the needles to hold them in place.Yes it is one of those newer EPA carbs with really fine threads , no springs and originally caps on both needles
FWIW
The initial set up is H =1 & L = 1.5
The final adjustment was H = 1 & 15/16 L = 1 & 3/8
I could never get it to 11,000 rpm
I have a funny feeling that the previous "mechanic" has messed up the jet holes and may have even mixed up the jets
The needles measured the exact same length ( never seen that before ) and the tapers looked visually the same .
In retro spec I should have replaced the carb but we can always do a better job in hindsight & the owner was about to toss the trimmer he just spent 1/2 the new price on a repair that did not woI havrk so I was trying extra hard to keep costs down.
Yes they are all over the place depending on the OEM of the carburetors. Zama seems to holding to a standard of a long and short ones. But honestly I haven't pay much attention lately to the needles as I rarely remove them since I gotten the USC. Walbro did at one time used different diameter screws. And yes some use o-rings used as a fiction device which must be replaced every so often. With all after markets out there, there no telling what we will see in the future.I have seen the needles the same length but different thread. I have seen them with the same thread, but different shape tip. And in some cases they are identical. Some of style carb use an O ring to create friction on the needles to hold them in place.
I think they've got pills that will help with that..Doesn't get rock hard.
So when is your next parole hearing? I have been free for 63 yrs now.Been married 40 years. You figure it out.