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Is the butterfly on the correct side of the throttle shaft, I see it milled flat this side, would not the butterfly fit up against that side of the shaft ? have come across incorrectly "rebuild" carbs before with butterfly wrong side, upside down etc, and like you said, not enough air passing...

Conrod is heat treated when built, thats why it looks like that, same with the big end too.

Requesting an IPL for ms251 please. I thought I had one, but nope I dont. well not yet anyway, thanks to you. Thanks in advance.

I would give it a spray with some circuit board elec cleaner, and then blow off with dry air, and as others have mentioned, put it in a box of rice/ dessicant for a few days to help it dry out. rescued many electrical items doing that, most recent were some ear buds dropped in the kitchen sink...

That hose is not put on correctly, you needed to fit it further down the barbed outlet, just fitting a hose clamp, and hoping it will work is not the way forward. As Pioneerguy600 said, you need that washer/ plate. any stihl dealer should be able to order it in for you.

I find that with pole saws, you dont want agressive grabby chain, just sharp smooth chain. much easier on the operator and the pole saw as a whole.

The main jet is behind what poke out into the venturi, and that piece is called the fuel delivery nozzle, that has a small one way valve or disc so it allows fuel to be drawn out into the venturi under vacuum, but does not allow air to be drawn back into the fuel side of the carb. The inlet...

sorry dont have any photos of it, just the main jet in the carb, search it on the web if you need to know what it is.

If its as badly worn as the photos show, then chances are you have put some high load on the clutch drum bearing, so just replace it and be done with it.

when Karting I just used 16:1

I know quite a few chaps here use .404 full chisel, but on the timber I cut, it just gets rounded over pretty quickly, I just use semi. Green wood, full chisel is great. Some dead eucs, you can get away with full chisel in .325, but not around here. If I ever get over to the states, Im going to...

How you Eastern chaps faring. Just hearing about the storms and power outages, and it would not have helped the fires either.

yep, pretty sure they are, I recall a thread a while back that covered the different timing of them.

IPL shows same part no for 066 to 660 1122 030 2005 there is a difference in cylds for au and usa and arctic, but that was the only difference, there, there are 2 different base gaskets 0.5mm au one and 1.0mm us one.

ive seen new stihl cylds with poor matching ports like the photos, apparently they blame the covid lockdowns on new staff not doing a very good job.

Yep, sounds like a solenoid to me. replace it and get a new fuel filter, orange type whilst your at it.

Diesel will last 5 or more years if kept in an air tight container. 10 with treatment. you will get some separation, so filtration required before using, or have a filter system set up to cycle if 5000gal or more. Diesel when it had high sulphur content was more susceptible to diesel bug/ alge...

Yup.

my money is on the 4 stroke fuel can mix up. you said it was getting more and more difficult to get running, thats when the scoring was happening. its just that you have now found it. your going to learn how to fix it, lots of good advice here, very knowledgeable people here, so listen to the...