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bob27s -> RE: 60 LX problem (1/8/2008 3:07:45 AM)
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To start with.....
Look in the exhaust port. Make sure the liner exhaust opening is lined up with the crankcase port (centered, not top-bottom).
If it is not centered, see below....
If it is.... check that the head bolts are tight.
Then...
If its blowing plugs, it is lean.
Or it is sucking bubbles.
You have been running Jett power for a while, so you know how that goes.
Very likely it is lean in the midrange if you can not transition up. If the low speed needle was move much at all, that will really mess things up.
Yes, it can affect full throttle too (sometimes)
First.....
Start it at full throttle. Just wide open. Use a 9x7 (or 9x8) prop.
Make sure the pressure line is connected. Back the main needle out 4-5 turns. It should be very rich at that point. If not, look for crud in the high speed needle.
If you can get a reasonable top end - let it run a bit - keep it just slightly rich for a tank or two.
Then ... try the low end.
See if it behaves. If not...
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Try first backing the low speed needle out 1/4 turn. It should be almost flush with the nut. A lean low/midrange will cause the engine to run poorly. One that is set too rich will mess things up too. There is some information on this on the website Tech section.
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The rotated liner stuff comes from an engine getting over heated. Here is how it happens....
If the engine gets hot/lean, it blows the plug. It probably got pretty hot at that point. The hot engine causes the head bolts to come loose. You then change the glow plug. When you install the new plug, as you attempt to tighten it, the entire head button and sleeve rotate. We see this sometimes with the BSE engines, and on few occations with the cast engines.
A rotated liner will not let the engine run. So folks try to lean it to proper rpm again..... and again, it just goes lean and toasts the plug.
If it did rotate (visual inspection) pull the finned head, and rotate it back into place. Make sure the head is tight. And re-tighten the head bolts just a bit while the engine is warm after its first run.
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Try another type of plug too. The K&B works ok.... if you can find a Rossi 2, 3, or 4, use one of those just to get the engine running on the top end first.
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Let me know how you make out....
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