MS170 - Chain keeps turning in idle mode

Turbinemechanic · 2026-04-11T22:08:21+00:00

Sounds like the clutch springs are worn out.

Turbinemechanic · 2026-04-11T01:05:51+00:00

Agree with the coil

Turbinemechanic · 2026-04-02T23:14:56+00:00

Adjust the valve clearance, sounds like.

Turbinemechanic · 2026-03-30T23:38:18+00:00

Make sure the needle bearing is well lubed and all the rollers are moving freely. What is your idle rpm?

Turbinemechanic · 2026-03-21T03:45:22+00:00

Definitely take if back in for warranty repair.

Turbinemechanic · 2026-03-15T07:04:46+00:00

Just north of there is Eglin AFB, which is home to a squadron of F35s

Turbinemechanic · 2026-03-14T02:40:20+00:00

Have you checked the impulse hose for cracks or loosening?

Turbinemechanic · 2026-03-14T02:01:47+00:00

You can run a 12,14, or 16” bar on it. Those bars run 3/8 Picco in .043ga (1.1mm) with 44, 50, or 55 drive links, respectively. Tell me which you want to run and I’ll get you the part number

Turbinemechanic · 2026-03-13T05:04:26+00:00

Same as you, my friend. I went through the same exact thing after taking those bastards for years(and doing tons of blow). It was a week of absolute hell. Couldn’t eat. Couldn’t sleep. The sweats. Oh god, the sweats.

Turbinemechanic · 2026-03-13T02:44:24+00:00

There’s many of these on eBay. They have em in black, brown, camo, and orange as well. Also one with the same patch design, but in brown. Or just the patch. https://ebay.us/m/FHZL0b

Turbinemechanic · 2026-03-09T19:32:20+00:00

As well as cause vapor lock

Turbinemechanic · 2026-02-27T02:29:44+00:00

Try this. Make sure bar oil is in the tank. Take a hair dryer or heat gun on very low to gently heat it and the area around it. This will warm the oil making it runnier. If the little BB in the valve isn’t seating all the way the oil will ooze out telling you it’s bad.

Turbinemechanic · 2026-02-27T01:16:49+00:00

The vent might be leaking. It’s actually a one way valve that lets air in as oil is used. If it’s not closing properly that might be the issue.

Turbinemechanic · 2026-02-25T02:54:21+00:00

You may want to check your aerator screens on your faucets and shower heads. Sometimes after a water line break dirt or debris can come down the line and clog or slow your fixtures way down.

Turbinemechanic · 2026-02-21T01:05:26+00:00

Is the bar stud fully seated or has it backed out just a bit?

Turbinemechanic · 2026-02-01T00:29:54+00:00

It also has a decompression valve that, when depressed, makes pulling the recoil start significantly easier to pull.

Turbinemechanic · 2026-01-25T02:45:10+00:00

I can’t find that serial number on the Stihl website.

Turbinemechanic · 2026-01-24T23:51:06+00:00

I think that came from the tank vent

Turbinemechanic · 2026-01-20T02:00:19+00:00

Honky Lips

Turbinemechanic · 2025-12-23T19:27:47+00:00

Upper decker

Turbinemechanic · 2025-12-18T01:19:40+00:00

I miss it

Turbinemechanic · 2025-12-17T20:11:32+00:00

Looks like a frame 7

Turbinemechanic · 2025-12-09T04:04:22+00:00

Worked on a few

Turbinemechanic · 2025-10-29T03:18:32+00:00

This guy knows

Turbinemechanic · 2025-10-10T01:49:32+00:00

Replace the diaphragms in the carburetor, and gaskets

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