All, I have a buddy that has a '96 XP with the 787 engine. In order to get it running right, he has done the following:
-Rebuilt carbs
-Replaced all fuel lines
-cleaned fuel tank
-replaced valve (On/Off/Res)
-Blocked off Oil Pump and gone to premix.
-replaced rotary valve cover (Carb Bolts were stripped)
We were checking it out yesterday with my compression tester, and compression is good on both cylinders. What I noted, though, was that when cranking the engine with the plugs out of both cylinders, we would see the fuel spray out of the MAG cylinder on the compression stroke, but not on the PTO cylinder. It seems to me that the MAG cylinder is getting fuel, but the PTO cylinder is not.
We did not have time to troubleshoot it that evening, but will spend more time on it later this week. My ideas are:
-PTO carb fuel lines not connected properly
-PTO carb ail leak at cover mount
-Rotary valve not timed properly, blocking the intake during the exhaust stroke on the PTO cylinder (may have changed when he replaced the rotary valve cover)
Any thoughts on these ideas and the most or least likely cause? Any other potential causes?
-Rebuilt carbs
-Replaced all fuel lines
-cleaned fuel tank
-replaced valve (On/Off/Res)
-Blocked off Oil Pump and gone to premix.
-replaced rotary valve cover (Carb Bolts were stripped)
We were checking it out yesterday with my compression tester, and compression is good on both cylinders. What I noted, though, was that when cranking the engine with the plugs out of both cylinders, we would see the fuel spray out of the MAG cylinder on the compression stroke, but not on the PTO cylinder. It seems to me that the MAG cylinder is getting fuel, but the PTO cylinder is not.
We did not have time to troubleshoot it that evening, but will spend more time on it later this week. My ideas are:
-PTO carb fuel lines not connected properly
-PTO carb ail leak at cover mount
-Rotary valve not timed properly, blocking the intake during the exhaust stroke on the PTO cylinder (may have changed when he replaced the rotary valve cover)
Any thoughts on these ideas and the most or least likely cause? Any other potential causes?
