Blue gets a transplant.

[garage gnome]

With 50 being the absolute minimum for operation, I'll take 70psi for compression. I guess you missed the part about four different carbs and two fuel filters with no improvement to same problem across the board. The fuel pump has been active since rebuild. I had it on the motor I pulled out of Blue and transferred it to this one. It gave me no problems before. This motor ran like a Singer Sewing Machine when I pulled it.

I know you replaced carbs and fuel filters. I am trying to relate to issues I've had. Not enough fuel on two occasions has caused similar problems for me. You have already eliminated one by swapping out carbs. I would still try changing out the fuel pump. Like I said, when it went dry during the engine swap, that could have damaged it.

[scoutpilot]

I don't see how it could dry out in two weeks.

[RedWilly]

What is the vacuum reading under load/driving? A restricted exhaust will cause vacuum to drop under load and result in lack of power. Valve timing issues due to worn gears or chain or sticking valves/weak springs will will cause fluctuation under load. When you say "hiccups" are you referring to actual backfires through the carb or exhaust or minor misfires?

[garage gnome]

I don't see how it could dry out in two weeks.

It is a possibility. You said you are at a dead end and I'm throwing out ideas. It is worth a shot.

[scoutpilot]

I'm going back in to gradually, to carefully check the valves. OH well, at this point I think I've got one sticking or not seating correctly. I am keenly aware of the difficulties trying to diagnose a problem over the net. I humbly thank you all for your efforts to help. I will let you know the outcome.

[SDSUPILOT]

Scout,
After I rebuilt my engine I had a similiar issue caused by several things. �Hesitation under load and occasionally popping through the carb. �I did the same checks with the points and condensers, fuel pressure, rebuilt the carb, checked the valves... �To make a long story short, double check your timing. �When I was completing my rebuild I incorrectly timed my engine and all I needed to make my engine run great was advance the timing about 10�. �

[scoutpilot]

Just pulled the valve cover and fired it up. Half the tappets are not turning.

[CJPilot]

At this point you need to confirm that the engine is internally OK. You have changed everything external.

I had an XPAG chew up a cam due to the zinc being removed from the newly formulated motor oils. �It took a few years to figure it out. Do a Google search to check out solid tappets and zinc.



Best of Luck
Steve

[scoutpilot]

I give up. Monday I am going to seek the advice of an older gentleman just down the road from me. He works on older flat head tractors a lot. I am at wits and expertises's end. If he can't help me with an easy fix. Blue may not appear at the show. I have begun the process of putting a new piston and all new rings in the red head motor that I removed from Blue. I will more than likely fix the leaking rear main seal while I am at it. Yeah a motor re-swap. No parts from Walck's yet. Cross your fingers.