Stihl 440

[laddo90]

I've got a stihl 440 with a big bore kit on it. I ported it and removed the base gasket, it runs at 13800 rpms and whips my brothers and friends 044 and 440. I have the high turned all the way in but if I turn the low out I got it up to 15500 before I stopped is that to high of an rpm or can I go higher?

 

[mitch95100]

Im going to step out on a limb and say you have no idea of what your doing.
The saw should 4-stroke at WOt but be clean in the cut. Runnin 15 grand guaranteed its not 4 stroking no more

 

[laddo90]

yeah I don't know what I'm doing. What does Wot mean?

 

[Fifelaker]

Wide Open Throttle.

 

[mdavlee]

You need to watch and listen to some videos of tuning a saw before you have a smeared piston. It may still be 4 stroking at 15.5k but I doubt it. You should be around 1 turn out on the H and L if not more towards 1.25 turns out.

 

[50blues]

:msp_ohmy:

 

[fearofpavement]

If it is running good with the H turned all the way in, you've got some carb issues. This saw is going to blow up if you don't treat it how it needs to be treated. Hopefully it isn't already scored. I would recommend taking a look at the piston through the muffler (even if you did before) and verify its condition.

 

[laddo90]

how does a two stroke, possibly four stroke

 

[laddo90]

piston is the same shape as when I put it back together after porting. Has 185 psi.

 

[moody]

I'd say you have lots of learning to do. If you don't know how to tune a saw or understand the basic concept of how a 2 stroke works you shouldn't be porting a saw.

Be ready to order another top end soon if you don't tune the saw right.

 

[mdavlee]

The saw should be rich enough out of the wood that it isn't a clean crisp sound like when it's cutting. Blsnelling has a video tuning a 440. Just search his name on YouTube and then watch and listen.

 

[mitch95100]

Can I see a pic of your Ms-180 With a 880 cylinder, you have in your signature..

 

[laddo90]

I've milled with it an hour.
Cut wood 10-12hours.
Carved with it 5 hours

The thing does't get to hot or any thing.

 

[LowVolt]

Hey man you really need to do some reading, watching and listening on here before you go any further.

Also I am curious to see this "stihl 180 w/ ported 880 piston and cylinder" that you have listed in your sig. That would be the ultimate sleeper saw.

 

[LowVolt]

Can I see a pic of your Ms-180 With a 880 cylinder, you have in your signature..

Damn you beat me to it.

 

[rdtreewalker]

Can I see a pic of your Ms-180 With a 880 cylinder, you have in your signature..

that would be something to see...

 

[fearofpavement]

how does a two stroke, possibly four stroke

The four stroking is referring to the sound the engine makes when it is having a "rich misfire". It is not the smooth screaming sound of a lean tuned saw but a rougher burbly uneven sound. If the saw sounds like this at wide open throttle but then smooths out when you put it in wood (load it down some), then the tune is just right. ie, rich enough to not burn it up but lean enough for good power output.

The rpms will be higher if the saw is leaner but that is a temporary situation until the engine goes kaput.

Proper tuning is paramount to any two stroke engine's life.

 

[cutforfun]

I've got a stihl 440 with a big bore kit on it. I ported it and removed the base gasket, it runs at 13800 rpms and whips my brothers and friends 044 and 440. I have the high turned all the way in but if I turn the low out I got it up to 15500 before I stopped is that to high of an rpm or can I go higher?

Limiters are still on the carb:msp_sneaky:,

 

[mitch95100]

Damn you beat me to it.

Id really like to make one. Mabey I could put a 3120 with a 550xp auto tune carb in my Ms-170?? Or a 454 Big block outta my 1 ton dually in my 660

 

[moody]

I've milled with it an hour.
Cut wood 10-12hours.
Carved with it 5 hours

The thing does't get to hot or any thing.

Im calling bull ****. If that saw ran for an hour I'd be surprised. Video some proof and I'll apologize