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Thu, May 24, 12 at 19:22
| I have observed that my 1994 LB 10420 2-stroke drinks fuel at what seems like twice the rate of my 2004 LB with a 4-stroke Tec engine. Are these old 2-stroke engines really that fuel inefficient or does this indicate a problem? |
Follow-Up Postings:
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- Posted by weed_cutter (My Page) on Thu, May 24, 12 at 20:33
| If you are not fouling plugs, carboning up the exhaust or generating lots of smoke I wouldn't worry. 2 strokes are not known for their efficiency. |
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| Two stroke engines by their design comsume a lot of fuel/oil mixture and as noted are not very efficient. A fair amount of mixture is actually converted to mechanical energy to run the mower. Unfortunately the design partially combusts quite a bit of fuel. You see the residue as as smoke and sludgy carbon build-up. It was a useful design when we needed a cheap to build engine and were not worried about the about cost of fuel and pollution. Times have fortunately changed. |
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| You don't have to convince me. Regardless of how Lawnboy afficianados feel about these mowers the only reason I keep one is as a curiosity. I'd never buy another 2-stroke mower even if they were still available. |
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| Might have a loose jet or a sinking float, but you should see a lot of oil smoke assuming you're using a traditional mix. The only way you can be running over-rich and not see oil smoke is by using a 'leaner' oil mix, like Opti-2 or similar. |
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