Echo SRM-225 Parts and Fitment

The air filter also sells under 13031054130 and A226000472, and cross-references to Oregon 30-119 and Stens 102-565 - four numbers, one filter. That is normal for Echo consumables and worth knowing before you decide a listing is the wrong part.

It is also the same filter shared with the PB-200, PB-2155 and PB-2455 blowers - the rest of what wears on Echo's larger PB-580 blower, which uses a different filter entirely, is on the blower parts page.

It also crosses to a blower outside that family entirely - the small handheld PB-2100, which uses this same filter number despite running its own Zama carburettor. The full numbers for that machine are on the PB-2100 blower parts page.

The reason the fitment list above is so long is that Echo built a family around one 21.2 cc engine. The SRM-225 trimmer, the GT-225 curved-shaft trimmer, the PE-225 edger, the PAS-225 power head and the SHC-225 hedge clipper are close relatives, and they share the consumables that bolt to the engine: filter, plug, primer bulb, fuel lines, carburettor.

What they do not share is anything past the shaft. Trimmer heads, edger blades and hedge bars are specific. So the practical rule is: engine-side parts cross the family freely, everything downstream of the clutch does not.

The closest relative of all is the SRM-210: it shares this filter, primer bulb and head with the 225, but not the carburettor - the numbers and that one difference are on the SRM-210 parts page.

The PE-225 edger in that family wears its own blade at the bottom, separate from anything upstream - the genuine number and the universal cross-reference that also fits it are on the Echo edger blade page.

Air filter. Costs a few dollars, takes a minute, and a clogged one is the single most common reason one of these will start and then die at idle. Multi-packs are the sensible buy.

Primer bulb and fuel line kit. These perish rather than wear - the bulb cracks and the lines go hard and split, usually where they enter the tank. A machine that will not prime is far more often this than a carburettor fault. Tune-up kits bundle both with the filter.

Whatever you refill it with, the mix is 50:1 two-stroke oil like every other Echo two-stroke.

Trimmer line. Obvious, but worth buying in a big spool rather than small refills: line stored dry lasts, and running out mid-job is what makes people force worn line through a tired head.

What is not worth stocking is a carburettor. See carburettors for why the one that looks dead usually is not.

The genuine primer bulb number for this family is on the Echo primer bulb page, and the matching spark plug number is on the Echo spark plug page.

If the engine starts and then dies on the throttle, the in-tank fuel filter is worth checking too - the genuine number for this family is on the Echo fuel filter page.

If the machine has stopped running properly, work through why an Echo will not start first. On this engine the order of likelihood is fuel, then filter, then spark, then carburettor - and it is genuinely rare for the fourth to be the answer when the first three have not been checked.

If it runs but cuts badly, the problem is downstream: head or line.

If the line simply needs replacing, the SRM-225 ships with a bump head - here is how to load it.

Not sure which diameter to load? The SRM-225 runs .095 in - what every other model takes is in the Echo trimmer line size chart.

For faster cutting in heavy growth the SRM-225 takes .095 in Black Diamond square line (330095071/073) - stay at .095 in on this 21.2 cc engine rather than stepping up to .105 in.

The SRM-225 has a split-boom twin, the PAS-225 power head, which takes the same engine parts but adds interchangeable attachments - those are covered on the Echo PAS attachment parts page.

To run a metal blade on the 225 instead of line you need the blade conversion kit and the right arbor - the Echo brush cutter parts page lists both.

None of the above applies if the fault is the pull cord itself rather than the engine - a cord that pulls with no resistance or has snapped needs the recoil starter and pull cord page instead, where the genuine assembly for this family is A051001312.

If the trimmer runs fine but the head turns roughly or howls under load, that is usually the gear head at the bottom of the shaft rather than the engine or the line - the genuine part and when grease alone fixes it are on the Echo gearbox and gear head page.

The step up from the SRM-225 is the Echo SRM-266, a 25.4 cc straight-shaft trimmer that runs a different carburettor (Zama RB-K112), a bigger A226000472 air filter and the larger Speed-Feed 450 head rather than the 400.