Owner’s manual
Do you use 40 1 or 50 1 gas in a chainsaw?
For the Craftsman 358355140 gas chainsaw, we use the exact gas-to-2-cycle oil mix ratio specified in the 358355140 owner's manual. In general, many chainsaws are designed for either 40:1 or 50:1; using the correct ratio protects the engine from premature wear and helps it start and run properly.
Quick answer: 40:1 vs 50:1
Both ratios can be correct depending on the engine design and the oil you use.
- 40:1 means more oil in the fuel (richer oil mix)
- 50:1 means less oil in the fuel (leaner oil mix)
- Too little oil can score the cylinder and piston
- Too much oil can increase smoke and carbon buildup
- Always mix fresh fuel and shake the container before filling
Mixing chart (per 1 gallon of gasoline)
| Mix ratio | 2-cycle oil per 1 gallon gas | What you typically notice |
|---|---|---|
| 40:1 | 3.2 fl oz | More lubrication; more smoke/residue |
| 50:1 | 2.6 fl oz | Cleaner running; relies on correct oil and tuning |
Why it matters for your 358355140
The correct mix ratio directly affects lubrication of the crankshaft bearings, piston, and cylinder. If the saw is hard to start, runs rough, or loses power, incorrect fuel mix and stale fuel are common causes.
If the saw is running poorly after fueling
Use these checks before adjusting anything:
- Drain old fuel and mix a fresh batch at the manual’s ratio
- Inspect the fuel system for cracks or air leaks
- Replace a brittle or leaking fuel line 530069216
- Check the fuel tank venting and cap seal (a bad cap can cause fuel starvation)
- Consider servicing the carburetor diaphragms if the saw surges or won’t stay running
Helpful DIY guidance
For step-by-step troubleshooting, use tips for a hard to start chainsaw.
Last updated: January 2026
What model number is the Craftsman 358355140 chainsaw?
The model number for this Craftsman gas chainsaw is 358355140. You will typically find it on the model tag on the saw housing or near the rear handle; matching that number ensures you get the correct parts list and specifications for your exact saw.
Where to find the model number on the saw
Check these common locations on Craftsman chainsaws:
- On a model tag or decal on the starter housing
- Near the rear handle or trigger area
- On the crankcase or chassis label
- Occasionally on the underside of the saw body (near the bar mount area)
If the label is dirty or oil-stained, wipe it clean and use a flashlight to read the full number.
Why the exact model number matters
Using 358355140 helps us match the correct diagrams and parts that fit your saw, including fuel system and cutting components.
| What you are doing | Use this identifier | Why it helps |
|---|---|---|
| Looking up parts diagrams | Model number 358355140 | Ensures the right exploded views and part callouts |
| Ordering replacement parts | Part ID (example: 530069216) | Confirms the exact item you are buying |
| Checking operating steps | 358355140 owner's manual | Confirms starting, fueling, and adjustment procedures |
Parts examples that match model 358355140
If you are troubleshooting fuel delivery or doing routine maintenance, these are common matches for this model:
- Fuel line 530069216 (fuel supply line from tank to carburetor)
- Fuel cap 530014347 (seals the fuel tank and helps prevent leaks)
- Fuel pik up 530095646 (fuel filter/pickup inside the tank)
Why it matters
A single digit difference in a chainsaw model number can change the carburetor setup, fuel line routing, bar and chain fit, and even starter components. Verifying 358355140 first prevents wrong-part returns and saves repair time.
Last updated: January 2026
Where is the model number on a chainsaw?
On the Craftsman 358355140 gas chainsaw, the model number is typically printed on the product identification label or ID tag on the saw body. We use that model number to match the correct parts list, diagrams, and specifications for your exact chainsaw.
Common places to check on a gas chainsaw
Look for a label, decal, or stamped ID tag in these spots:
- On the starter housing (recoil starter cover) near the pull cord
- On the rear handle area, close to the throttle trigger
- On the underside of the saw body near the fuel tank
- Near the bar mount area (clutch cover side), sometimes on the chassis
- On the bottom of the handle frame or near the chain brake housing
If the label is oily or faded, wipe it with a rag and mild cleaner so the numbers are readable.
What the label usually shows
Most chainsaw ID labels include more than just the model number.
| Item on label | What it’s used for |
|---|---|
| Model number (example: 358355140) | Identifies the exact saw for parts lookup |
| Serial number | Helps identify production run and revisions |
| Brand name (Craftsman) | Confirms manufacturer family |
Why it matters
Using the correct model number prevents ordering the wrong chain, bar, fuel system parts, or carburetor components. For example, once you confirm the model, you can confidently match wear items like the chain 91PX052G and bar 140SDEA041 to the correct fit.
Next step after you find it
- Write the model number exactly as shown
- Take a clear photo of the label for future reference
- Use the model number to cross-check diagrams in the 358355140 owner’s manual
Last updated: January 2026
