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Post by crrider on Sept 5, 2014 11:35:49 GMT -5
Hello to all and thanks for taking time out to read my post. I've bought parts from PWOnly before but just now discovered there's also a forum! It's been my experience that these forums are the best place to get knowledgeable advise and meet great like-minded people.
Here's my situation. Bought a 954 PW80 last weekend. It ran perfect until yesterday. My 8 year old tipped it over while starting it and it has run very poorly since. I then also discovered the oil reservoir was just about completely empty at this time. I thought the level was good but upon looking closely realized that I was looking at discoloration and not the actual level. I'm guessing the last time he rode it it may have been running without 2 stroke oil. I filled the reservoir but I can't get the pump to pump any oil out. I've tried pinching the hose off and running it for 15 seconds or so to bleed it but to no avail. I also decided to do a compression test and it came in just under 110 psi. That didn't seem too low for it to run better than it is but I have no frame of reference. I've had other PW's but never a problem like this....heck hardly any problems at all with these reliable machines.
So here's my questions:
1. How does one get the pump pumping again?
2. Could the absence of oil in the cylinder (pump not working) be the cause for the poor performance?
3. Could the drop have done damage to something to cause it to run like this (coil?)
4. Is 110 psi too low?
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Post by burlbo on Sept 9, 2014 9:13:57 GMT -5
This link is for a pw80 manual, www.yamaha-motor.com/assets/service/manuals/2005/lit-11626-18-30_1089.pdf. See page 13 for the autolube pump bleeding procedure. If the reservoir was completely empty, it will take a little bit of time and patience to get it through the system again. I ended up installing transparent hoses so I could see the oil traveling through. Once you get it to the pump, run the engine to get it to the carb, but mix fuel in the tank while the oil is still making its way to the carb. Once you know the oil has traveled to the carb, you can go back to straight gas and the ratio will even itself out. It will smoke more than normal until it does even out. The absence of oil will make it run poorly, but it could also be a loose wire just the same. I would take care of the oil issue first, before further diagnosing. With the compression, from what I have seen others say, 110 - 120 is normal, but I am not positive.
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