manolocross
Well-Known Member
Can you test the pop off pressure while the carbs are still in the ski and without disassembly of carbs?Can u just attach a popoff pressure tool to the fuel in nipple to see if the carbs are in spec?
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Pop off pressure test question
- Thread starter manolocross
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manolocross
Well-Known Member
Thank you for your reply... i have a 1995 seadoo xp and am new to owning a pwc.It has the 720 motor with dual carbs...what should the pop off pressure be on the carbs? It is hard to start...but when it fires its ok...125 psi both cylinders
Try another known good gauge.
Your rotary cover may need machined. Suggest you read your Shop manual on the
details of properly measureing that. It it major contributor of hard starting & wearing
out the starter prematurely!
Your manual has a carb section, The How-to here has get info, here is a reference:
http://www.seadoosource.com/carbreference.html
Just read up & Enjoy! Bill
Your rotary cover may need machined. Suggest you read your Shop manual on the
details of properly measureing that. It it major contributor of hard starting & wearing
out the starter prematurely!
Your manual has a carb section, The How-to here has get info, here is a reference:
http://www.seadoosource.com/carbreference.html
Just read up & Enjoy! Bill
BMANN06
Well-Known Member
Don't mean to hijack ....
I too am about to perform the pop off test, I figured I'd ask in this post as opposed to starting a new one.
My question: (and I'm new to this so bear with me)
1. Do i have to disassemble the carb to perform the test? Can i just block the return and pressurize the system and hear the pop? Ive got fuel in them right now to lubricate.
Many thanks!
I too am about to perform the pop off test, I figured I'd ask in this post as opposed to starting a new one.
My question: (and I'm new to this so bear with me)
1. Do i have to disassemble the carb to perform the test? Can i just block the return and pressurize the system and hear the pop? Ive got fuel in them right now to lubricate.
Many thanks!
Dr Honda
Well-Known Member
Hi guys,
I do not recommend checking pop-off with the carbs on.
To get a good reliable test... you need to have the needle wet with oil. Also, it's too hard to make sure everything is plugged off, and if there is any tension from the diaphram... it's going to mess up your numbers.
If you are going to bother to check it... take them off, sit down at your work bench, and do it right.
FYI... your pop-off should be 40-56 psi
As far as the 125 psi cyl pressure... that's too low for a 720 engine. Spec is 150 psi, and I call the bottom of the usable range 135 psi. Anything past that, and even if you do get it running... the blow by will be high enough to melt the piston skirts, and cause a melt down. Right now, you could freshen up the top end cheap. If you keep running it as it is... it will be a full rebuild.
I do not recommend checking pop-off with the carbs on.
To get a good reliable test... you need to have the needle wet with oil. Also, it's too hard to make sure everything is plugged off, and if there is any tension from the diaphram... it's going to mess up your numbers.
If you are going to bother to check it... take them off, sit down at your work bench, and do it right.
FYI... your pop-off should be 40-56 psi
As far as the 125 psi cyl pressure... that's too low for a 720 engine. Spec is 150 psi, and I call the bottom of the usable range 135 psi. Anything past that, and even if you do get it running... the blow by will be high enough to melt the piston skirts, and cause a melt down. Right now, you could freshen up the top end cheap. If you keep running it as it is... it will be a full rebuild.
manolocross
Well-Known Member
Thank you for your reply DR HONDA..this is my first pwc..do you think i can get away with new rings or a complete top end wih pistons?
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