Tuning a 372xp

[tater28]

Im pretty new to the world of chainsaws but I tend to pick up on things pretty quick. I recently put together a 372xp with a mildly ported BB kit and a muff mod. I am running 100 LL fuel in the saw with a 40:1 mix. I have been trying to tune the carb in the past few days. I started by trying to listen to it 4 stroke and by reading the plug. Well I had it 4 stroking quiet a bit in and out of the wood. I shut it down in the middle of my cut and the plug was kind of a light grey color. I leaned the carb down and still got the same results with less 4 stroking. Today I hooked up a tach on it, out of the wood It was turning around 10,000 rpms. I turned it up to about 12,500 rpms. I shut it off at w.o.t. and pulled the plug. I had acheived a chocolate milk color. I took the saw out to cut some this evening and to check the rpms in the cut. It was turning roughly 10,000 rpms in the cut. I shut the saw off in the middle of a cut and checked the plug. The color was back to that light sandy greyish color again. Any input on this would be greatly appreciated. I am trying to find that fine line where I will get max performance with out running it too lean. I will try to post pics of the plug after I pulled it this evening.

 

[w8ye]

Set the high speed at 12500 with your tach and forget all that other stuff about the spark plug.

 

[komatsuvarna]

Athens Tn huh? Even more stranger...that makes 4 of us from this little town now . Im on the west side of A town.

I'd leave the plug in the saw, set it about 13,000ish if it's close to stock and let it roll....JMO

I've got a ported 372 turning a bit more than 15K, but that's not optimal for a woods saw IMO.

 

[tater28]

Athens Tn huh? Even more stranger...that makes 4 of us from this little town now . Im on the west side of A town.

I'd leave the plug in the saw, set it about 13,000ish if it's close to stock and let it roll....JMO

I've got a ported 372 turning a bit more than 15K, but that's not optimal for a woods saw IMO.

I know a couple other guys from town on here. Im on the outskirts of town in the clearwater community. I have about determined that just setting the rpms around 13000 or 13500 and forgetting the rest is going to be my best option otherwise I am gong to drive myself insane with it

 

[gregn]

Athens Tn huh? Even more stranger...that makes 4 of us from this little town now .

Must be in the water :hmm3grin2orange:

 

[komatsuvarna]

I know a couple other guys from town on here. Im on the outskirts of town in the clearwater community. I have about determined that just setting the rpms around 13000 or 13500 and forgetting the rest is going to be my best option otherwise I am gong to drive myself insane with it

Im just a couple miles directly south of you then..... kinda in the Mouse Creek/ Idle Wild/ Rogers Creek area.

 

[tater28]

Athens Tn huh? Even more stranger...that makes 4 of us from this little town now .

Must be in the water :hmm3grin2orange:

we must drink from the same well

 

[komatsuvarna]

I know a couple other guys from town on here. Im on the outskirts of town in the clearwater community. I have about determined that just setting the rpms around 13000 or 13500 and forgetting the rest is going to be my best option otherwise I am gong to drive myself insane with it

I've been there before brother. Just remember its always better a bit rich than a bit lean. The more your around it you'll get more comfortable.

I don't know much, but if ya ever want a second opinion give me a holler!

 

[gregn]

we must drink from the same well[/QUOT

I guess I could be held partially responsible for your new found obsession. At least u have good taste in saws.

 

[KenJax Tree]

My BB 372xp is muff modded and i opened the stock port as big as the deflector and its happy at 13800 and the MM xpdub is happy at 13500.

 

[RedneckChainsawRepair]

If you have a blue coil be carefull, you will think you are four stroking around 13.5K +/- 100 rev-limited coil. If using tach I just go 12.5K to 13K stock.

Setting by ear, I just set to 4 stroking and then run it where it clears up when it hits the wood. easy as pie. :msp_tongue::msp_razz:

 

[RedneckChainsawRepair]

Did I just say pie. :hmm3grin2orange:

 

[KenJax Tree]

If you have a blue coil be carefull, you will think you are four stroking around 13.5K +/- 100 rev-limited coil. If using tach I just go 12.5K to 13K stock.

Setting by ear, I just set to 4 stroking and then run it where it clears up when it hits the wood. easy as pie. :msp_tongue::msp_razz:

My coils are blue but i put the ones from my 346's in the 372's so its good for 14100 the 346's are unlimited now

 

[tater28]

we must drink from the same well[/QUOT

I guess I could be held partially responsible for your new found obsession. At least u have good taste in saws.

Yeah I will lay some of the blame on you for this:help:

 

[tater28]

Thanks for the input guys. I'm just going to set it around 13000 and run her till she blows. Like I posted earlier it has had some porting done and a muff mod so surely it can handle running at factory specs