Author Topic: Need tuning / plug choice help for Pacific Northwest US  (Read 1516 times)

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Offline MindFork

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Need tuning / plug choice help for Pacific Northwest US
« on: October 06, 2013, 03:12:24 pm »
This is going to be long...

On my EHP ported Redmax I got from Kevin, I am having problems with "wet fouling" the plug.  When I got the saw, the Bosch WS5E plug looked nice and dry, kind of like a combination of #11 and #13 on this page from the spark plug thread: http://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html

After just a couple tanks of gas, the plug started to exhibit wet fouling that looks a lot like #1 on that page.  I leaned out the H jet a little bit, but it didn't seem to make a difference.  The plug died on me yesterday and I put in a new Bosch WSR6f (made in China, not Germany, though) and the saw ran good for the rest of the afternoon.

I pulled the plug after I was done and it was also wet fouled.  This makes sense from the perspective of it being a higher heat range plug so it's not self-cleaning (according to that page above), but it looked exactly the same as the WS5E did as far as being oil fouled.

I am going to get more WS5E plugs from Northwood Saw since that's what Kevin ran and they are one level cooler.

I am also going to lean out the L jet to see if that helps.

Other variables are that Kevin runs 32:1 and I am running 40:1, so I'm automatically a little more rich.  My fuel oil is Maxima K2 mostly because it doesn't stink like a lot of other oils and it has a good reputation.

I have read about humidity, temperature, elevation, etc all playing a role in a saw's tune.  I am 30 minutes inland from the Puget Sound, so I am not dealing with salt-water humidity.  It rains a lot here and is usually very humid, especially in winter.  I cut on days where it's cooler and not raining, but humidity is still high.

So if anyone has other advice aside from leaning out the L and running a WS5E, please let me know.

Thanks,
Cameron

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Offline Cut4fun .

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Sounds like you must be really rich. Never seen the plug wet in that saw  running a bosch 5 6 or 7 in it.

It was fat when it left here with 32:1 Klotz Original 100%. I am betting it is even fatter now with your mix and location.

Any idea what rpm you are turning WOT out of wood?

  If you cant tune by ear and checking plug method. Maybe use  a tach or someone that knows how to tune a saw correctly?
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Offline Cut4fun .

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I cant remember is there a half choked setting?  Pull choke out pop and then half till warm and then push all the way in?  I cant remember on this saw.  Maybe forgetting to push the choke all the way in and off?  I've done this on some poulans in the past.
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Offline MindFork

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There isn't really a "half choke" on this one.  I have to be very careful to not push it in all the way after the "pop" and once it starts, I push it in right after I blip the throttle to go into low idle.

I don't know the RPM it's running.  I did lean out the H jet and it sounds good at WOT with a little roughness, and cleans up nicely in the cut.  I think the L is still too rich even though I leaned it out a little bit. 

When I tune the L, I usually aim for the midpoint between too lean and too rich.  I think that I will aim for just a little bit before too lean on the L and see how this plug holds up.  I am cleaning the plug off after each use to keep it from dying early.  Going to order 6 WS5E plugs today, too.

Offline Cut4fun .

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Why messing with L ?    You having throttle response problems or idle problems?

H is the in the cuts. Go for 14K to 15K WOT  Art said he went as high as 15K.   Happy medium 14.5K.
I sent it out 13.8K from here.

Take me a min to set that for you, wish I could help set to your area and mix.
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Offline MindFork

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Why messing with L ?    You having throttle response problems or idle problems?

H is the in the cuts. Go for 14K to 15K WOT  Art said he went as high as 15K.   Happy medium 14.5K.
I sent it out 13.8K from here.

Take me a min to set that for you, wish I could help set to your area and mix.
Yea, I need to just get a tach.  As for the L I was thinking that even if my H is ok now that I adjusted it, if the L is too rich then it could contribute to the wet fouling problem.  I read some threads where that was mentioned as something to watch out for.

Offline Cut4fun .

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Hopefully someone more experienced in this with what your thinking steps in on L thing.  Never had that problem.
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Offline 660magnum

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The WSR6F spark plug is a extended tip 2 stroke design whereas the

WS5E spark plug is a non-extended tip used in a racing saw where the other spark plug may hit the piston.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
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Offline Cut4fun .

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From my understanding the WS5E was a coller plug some of the alky racers used. I used them and used them in my woods ported saws too.  The redmax 5000 can use the stock plugs, no clearance issues with piston.
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