Cuyuna 440 Engine Help Needed
I’m trying to get my sons’ sled running and I have a question that I'm having trouble getting a definitive answer to. He has a1980 Scorpion whip 440 where the PTO side (#1) cylinder that does not appear to be firing correctly. The points and condensers have been changed and so has the PTO side coil. The timing has also been reset to .110 BTDC when fully advanced.
From the looks of things the PTO side seems to be firing intermittently (you can really hear it when the exhaust is pulled off). That cylinder is also not capable of keeping the engine running at an idle, when the mag side (#2) cylinder spark plug wire is pulled off.
Does anybody know if this engine should be able to stay running when only the PTO side plug wire is attached?
FYI – I have another 440 that will not stay running on only the PTO side cylinder, but unlike my sons’ it runs great and never fouls a plug.
Does anybody have any idea as to what else might be causing the PTO side firing problem? I should also mention that the compression and ignition settings all appear to be within tolerance and the PTO side piston, rings and crank seal have all been replaced. I’m also getting fuel to that cylinder because the plug is constantly getting wet fouled. I also installed a full carb kit in late last year.
One more question. Even though it’s new, does anybody know how to test the coil to see if it is really good. Also, is there a way to test the wires that come from the points to the coil without pulling off the flywheel and disconnecting them?
Any ideas will be greatly appreciated.
Last edited by Scorp80; 11-30-2005 at 10:10 AM.