25XD 85 model........Fire but no combustion

[Bob Gilvary]

Re: 25XD 85 model........Fire but no combustion

There should be a line cast into the starter housing above the dashpot on the starboard side of the engine and a decal on the flywheel if the decal is gone the should be a punch mark to mark TDC. 10 volts are not uncommon at the trigger leads, don't know why the system shuts down when your testing it I have not run in to that, your using a DVA when testing aren't you. You don't have exhaust pressure build from to much water in the tank, snuffing the top cyl. with exhaust pressure at the intake port do you?

I had to think a moment about what the hell a dashpot was. It's that thing that fell off yesterday and fell into the barrel. I know just where it is.
I saw the raised cast line, just at the forward side of the opening of the recoil starter housing. There's that line on both sides of the starter housing, so I wasn't sure that was it.
My flywheel has painted in recessed degree lines. Some have dots at the lines. 1 dot, between 3 and 4 degree line past it there's 4 dots, a couple more degree lines back, there's 2 dots over a line. Way advanced of the single dot are 3 dots over another degree line. No decal

I put this barrel under the engine after running it on the muffs and noticing all the sludge build up in the prop and running down the skeg. No I don't have water over the exhaust ports in the midsection, if that's what your asking. I did this for back pressure and to be able to run up rpm's if needed. I can put it in gear and blow the water out of the barrel.

I ran it today with the top plug out, to watch what would come out of the hole. I tried to put a piece of paper near the plug hole to see how wet it would get, but too much compression. Not much fuel mist came out. Reason I did that was I thought the plug was looking a little dryer then the bottom one

This is a digital multimeter using a CDI peak reading adapter.

 

[Bob Gilvary]

Re: 25XD 85 model........Fire but no combustion

After taking off the exhaust cover and seeing what I can see, is in good condition, I've decided to put it all back together, remove the lower unit and run it without water for a brief period to positively eliminate the possibility of water intrusion, should it show signs of good operation without a water supply.

It will be a while before I get back with the results of this test.