Author Topic: Fuel type and tuning differences.  (Read 231 times)

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Offline KilliansRedLeo

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Re: Fuel type and tuning differences.
« Reply #10 on: April 16, 2014, 12:09:20 pm »
I remember when we first started using BelRay oil in the race bikes in the late 60s, it scared the chit out of us all because we were not getting nice 'MilkyWay' brown plugs. :o After much discussion with BelRay folks we found out that we would never get the color we were used to, they said that the synthetic stuff burned so much cleaner than the Torco T2 we were using that we would probably only get a medium tan/brown color plug.

That being said the gray still scares the hell out of me. With the E10/XP oil I was getting a nice brown color.
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Offline KilliansRedLeo

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Re: Fuel type and tuning differences.
« Reply #11 on: April 16, 2014, 12:54:14 pm »
OK, the saw appears to be running correctly, plug is still gray, but I have not put it in wood yet this time around. I have not been running it for more than a minute or so each test. So going to put it in wood and see if it blows up! L set @ 1 5/8 and H set @ 1 3/4! If it does not blow up and I get a decent looking plug, I'll drain the fuel and switch to Stihl Moto-Mix and see how it runs with the same carb settings.
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Offline KilliansRedLeo

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Re: Fuel type and tuning differences.
« Reply #12 on: April 16, 2014, 03:11:55 pm »
Well, I put it in wood. The saw did not blow up. Was idling at 2700 12500 WOT. Cut three cookies with it, ran pretty good. Took it into the shop pulled the plug.......pure white! Surely it must be an air leak to make it do this. Pulled the saw apart again and did another pressure/vacuum test. Started with 80KPa to 4.5 minutes to get to 60 Kpa. Did Vacuum test 60 Kpa close to two minutes to get to 50 Kpa.

Has got to be an air leak somewhere but can't find it, only things left to test are the carb spacer.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

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Offline 660magnum

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Re: Fuel type and tuning differences.
« Reply #13 on: April 16, 2014, 03:33:13 pm »
Well, I put it in wood. The saw did not blow up. Was idling at 2700 12500 WOT. Cut three cookies with it, ran pretty good. Took it into the shop pulled the plug.......pure white! Surely it must be an air leak to make it do this. Pulled the saw apart again and did another pressure/vacuum test. Started with 80KPa to 4.5 minutes to get to 60 Kpa. Did Vacuum test 60 Kpa close to two minutes to get to 50 Kpa.

Has got to be an air leak somewhere but can't find it, only things left to test are the carb spacer.
That sure didn't show a air leak?

It didn't show a problem with the high speed nozzle check valve either.
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Offline 3000 FPS

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Re: Fuel type and tuning differences.
« Reply #14 on: April 16, 2014, 05:06:22 pm »
If the saw is 4 stroking at wide open throttle and you hear it clean up when put into wood I would not sweat it.

It would not bother me if the plug was green as long as I hear a good 4 stroking.   
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Offline 660magnum

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Re: Fuel type and tuning differences.
« Reply #15 on: April 16, 2014, 05:17:25 pm »
I don't look at spark plugs that much. Maybe if the chainsaw will not start? Or if I'm tearing it down for some reason. I might look at te numbers of the plug on a strange chainsaw?
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Offline H 2 H

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Re: Fuel type and tuning differences.
« Reply #16 on: April 16, 2014, 06:02:44 pm »
LOL

I just changed premix oil just a few months back and I was worried about the carb settings myself on all my saws I couldn't get one saw to run right thinking it was a oil problem then I changed my fuel and impulse line and everything was a oh k  ;D

I had a **** fuel line on a 60 cc saw
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Offline 1manband

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Re: Fuel type and tuning differences.
« Reply #17 on: April 16, 2014, 07:20:44 pm »
maybe something to concider...

trufuel and motomix seem to be made by the same company in shreveport, la.  never used either, myself.  are they the same thing?

running the winter-blend gas we got up here, on a 80 degree day like we had on monday may change things a bit?
read somewhere a while back, that winter blend unleaded supposedly adds butane as an ingredient, for quicker starts.

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Offline KilliansRedLeo

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Re: Fuel type and tuning differences.
« Reply #18 on: April 16, 2014, 08:21:09 pm »

Sounds like the high speed nozzle check valve is blown in the carburetor?

Sir James Winningham WINNS! Jim send me your address, I will send you a saw to play around with!
 
I dug around and found a new carb, switched carbs, everything is as it should be. Will put B/C on it in the AM and see what happens. Did not take the carb apart, was so pizzed off, just changed the carb and gave it a shot. If it runs well in the AM, I'll start trying the other brands of fuel.
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Offline 3000 FPS

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Re: Fuel type and tuning differences.
« Reply #19 on: April 16, 2014, 09:18:37 pm »
I must have missed something.   Was the saw not running right.
PP 505, 475, 445.

 

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