Smokey, 30% minimum is the manufacture recommendation.
jonelli, what type of folding prop do you have?
jonelli, what type of folding prop do you have?
Can you point me to instructions on how and where to check it?Is it safe to assume that you have not checked the lift pump?
It does not. No noticeable smoke. I’ve read though that it could still be the exhaust elbow with these symptoms.At full throttle in gear does it smoke?
I think it would if you had an exhaust restriction.
Got it. I will need more info obviously to figure that out and will check that eventually. I feel though that based on everything else, and the bad fuel consumption to get it to 2000rpm while motoring, and everything I’ve read about the mixing elbows, that it’s the elbow that is the most likely cause. Again, I’m no expert, but it seems to make sense. I do run the engine idle to charge a lot while on a mooring overnights, and there was black soot sprinkled around under that area of the elbow. I’ve got a secondary fuel filter mounted to the sliding wood cover that would need to come out to get to the elbow. I’m going to start a new thread just for that. I have a lot of questions about the elbow now.I'm not familiar with the M25XP so I cannot give you specific instruction.
Basically you disconnect the fuel pump output and direct it onto a container. Run the pump for a specific time and measure the fuel in the container. Does it meet specification?
That’s good to hear. Not sure what mine is made of yet. I’ll keep my fingers crossed I can do the same. I probably can’t get to it now for another week.If it is like mine, the elbow is made from black iron gas pipe and fittings. The "mixing" part is a short pipe welded into a close nipple. When I did mine, everything was in good shape except for some buildup. I cleaned it out and reinstalled. To remove it, you will need to remove the exhaust flange and you will need to replace the gasket at least. I was lucky and careful and it came off without any damage but others have broken the flange studs and/or the flange. It is also a very good idea to install a hump hose to isolate the engine vibration from the water-lift to prevent damage to it. Exhaust System
I have the same model - '88 mkII. Its hard to tell whats going on and the condition of the cable, but can tell you that the screw looking stopper on your cable goes on the OTHER side of the lever.Yes. It was insane. Now tied up at the slip I can get up to 2600-2700 or higher RPM in gear. I was getting 1900-2000 before. It was immediately obvious that this solved the issue.
It explains why the fuel pump tested fine, the in/out air made no difference, and why sometimes it went a little more or less on max RPM.
I have to give credit to my friend. He came over to help me do a last go-over on this motor issue, brought a compression tester and digital tach. I was showing him the throttle mechanism and he noticed the fuel stop cable going through the bracket like that and said “what’s going on here?” And the rest is history.
We high five’d, cracked a beer and celebrated.