I've got a '94 Yamaha WaveBlaster 700. I did a BIG No-No and lent it to my fiend a few weeks ago. I get it back, and it won't start (Cranks but wont ignite). I test compression, and get a reading of 20 p.s.i per cylinder. I ask what happened, and he tells me that he turned it on in the parking lot, and the throttle seemed to be stuck, cause the engine revv'd up at full speed for some Unaccounted period of seconds, and it just SHUT OFF on him. I assume he ran it WITHOUT water since it was in a parking lot.
I have the ski now, it just cranks but won't start. I've got spark, I've got fuel, just NO compression. Service manual says that it can be one of the following:
1- Head Gasket
2-Cylinder Head
3-Oil Seal/crank
4-Reed Valve
5-Piston, Cylinder Wall, Piston Ring
What's the most effective order and procedure of diagnosing, to get to the bottom of it ? Any way that I can tell where the compresson leak is coming from, before I start tearing apart ? I was reading all possible compression postings, and read the "wet test" in which you pour oil into the cylinder and re-check compression, to see if the compression rises. So I'll apply that when I check for the rings. I have NO clue of any methods for the other possible problems. ANY help would be greatly appreciated. Thank you.
Studio 500
I have the ski now, it just cranks but won't start. I've got spark, I've got fuel, just NO compression. Service manual says that it can be one of the following:
1- Head Gasket
2-Cylinder Head
3-Oil Seal/crank
4-Reed Valve
5-Piston, Cylinder Wall, Piston Ring
What's the most effective order and procedure of diagnosing, to get to the bottom of it ? Any way that I can tell where the compresson leak is coming from, before I start tearing apart ? I was reading all possible compression postings, and read the "wet test" in which you pour oil into the cylinder and re-check compression, to see if the compression rises. So I'll apply that when I check for the rings. I have NO clue of any methods for the other possible problems. ANY help would be greatly appreciated. Thank you.
Studio 500
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