Re: 1988 125 force rough idle
I'm concerned over this sequence of symptoms.<br />Your motor ran fine before changing the impellor out, and now it runs poorly, and the fuel is only 2 weeks old....<br /><br />My approach to this problem would be to inspect the fuel tank and carb bowls for condesate.<br />No water? Compression test and plug inspection.<br />My reasoning here --- more water pressure in the cooling circuit of a previously-overheated motor, could be allowing water to enter the combustion chamber.<br />If this motor overheated, the head gaskets, exaust port plate gaskets, or both may have warped,causing them to loose seal.<br />I know this is somewhat "Spock-logic", but it makes sense to me, to check those items first.<br />Plugs should have some signs of operation, and not "brand new looking", even after only 1 hour of run-time. If any one of them is spotlessly clean, or is clean except for minor rust, means water injestion. Ungood. A side-note:<br />Water in the fuel system can also steam-clean your plugs, but they would be all clean from each associated carberator (carbs serving more then one cylinder), giving those plugs a dose of water at the same time. So look for one or two conspicously-clean plugs.
