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I have a 38cc champion chainsaw. The hi, lo and idle settings are all wronge so i cant get working correctly. Could you please tell me how to get the wright settings for it? cheers Nick

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Hi Nick and welcome to FixYa. I am Kelly

If your starting from scratch do this:
1. First off completely remove the jets one at a time and inspect for a point on the end of the jet. If one of the points is missing it is stuck in the body of the carb and will have to be removed. (I have had to replace carbs because of this due to the fact the piont proke off in the body and could not get the broken piece out of the carb body)
2. Re install each jet and screw it in until it reaches the closed position until they just stop moving DO NOT over tighten.
3. Open each jet 1.5 turns from closed
4. Start the chain saw and accelerate to max speed
5. Adjust the high jet so that under no load it no longer sputters / misses
6. Let unit return to idle
7. As soon as it reaches idle accerate to full throttle again
a. Repeat the return to idle and accelerate process and adjust the low jet setting so that the chainsaw does not hesitate when you rapidly accelerate the engine.
8. Adjust the idle speed so that the chain saw idles but does not rotate the chain.

That is pretty much 2 jet / 2 cycle carb adjustment 101.

Make sure you have the air filter installed when making final adjustments as air filters can cause it to perform differently when installed vs removed especially if the filter is not clean.

Make MINOR 1/8 th turn or less adjustments as your going through the adjustment process!

Thanks for choosing FixYa.


Posted on Oct 04, 2010

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How to adjust a carburetor on a chainsaw

Depressing the throttle slightly we listen to the engine. If the engine hesitates to accelerate, the LO screw should be opened 1/8 of a turn. If we open the screw too much, the engine will not accelerate smoothly and start shaking (too rich of a mixture). In this case we should close the LO screw slightly. We repeat this procedure until the engine reacts smoothly when adding power. Meanwhile, a readjustment of the idle speed may be needed.

After the LO mixture has been adjusted, we proceed with the HI screw adjustment. After securing the paramotor, we open the throttle to full power. We turn the HI screw to the left or right until the maximum RPM is reached. From this position just a slight turn to the right should cause a significant RPM drop. This means the lean side of the mixture has been achieved. Immediately we OPEN the screw to the left to prevent the engine from overheating!

Let us repeat once again this critical step:

At full power we tune for maximum RPM, then we close the HI screw more, until a drop in RPMs is noticed. When the drop in RPMs occurs we open the HI screw again until we reach maximum RPMs once again, and then we open the screw more until we have a drop of 20 to 60 RPMs. In this position the carburetor will be perfectly tuned slightly on the rich (safe) side.

Next, we should close the throttle and recheck the idle and the LO screw adjustment. If the carburetor was tuned properly, the idle will return to the normal setting described above.

To put it in a nutshell, if the engine idles and accelerates smoothly, does not smoke heavily and achieves 20- 60 RPM below maximum RPM, the carburetor is tuned correctly.

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What is the 2 stroke mixture ratio for a McCulloch 338 chainsaw please


It is 40:1 (see below)

If this helps, pls leave feedback, if not let me know and I'll try and help some more!

~~Technical Specification~~

~ Engine
Capacity 38cc
Stroke 32mm
Idle Speed 3000rpm
Max speed 13000rpm
Power 1.6kW (2.15hp)

~ Ignition
Manufacturer Walboro
Type of ignition CD
Spark plug Champion
Electrode Gap 5mm

Unleaded Petrol mixed 40:1 with 2-stroke engine oil
Capacty 0.38 litres

Max 111DbA (as loud as a very loud Nightclub get those earplugs in!!!)

4.7Kg (trust me that is very light for a chainsaw)

~Chain Bar
Length 14" (36cm)

As with all chainsaws it is essential to wear full protective equpment, and be aware of others around you. You should wear

Safety Hard Hat with Face shield
Safety Googles
Ear plugs/Ear Defenders
Snug Tight Fitting Clothing
Safety Footware with steel toecaps and non-slip soles.
Heavy Duty Rigger Gloves
Leg Chaps

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