All,
I'm new to the forum. I'm looking for some advice/help with a potential boat purchase. I'm looking to purchase a new boat with a 2002 200hp Optimax with roughly 490 hours. I have compression info.
Compression by cylinder.
#1 - 108
#2 - 108
#3 - 110
#4 - 120
#5 - 112
#6 - 108
I haven't been able to track down definite specs, but one related thread suggested "normal" operating range being from 90-110 psi. I questioned this given all six cylinders are near or above top threshold. Does anyone have additional information experience?
In addition, the rule of thumb I was always told was net variation across cylinders greater than 15psi is troublesome. Based on what the compression above I'm looking at 12psi variance. Would most consider that acceptable/good or nearing the point of concern?
Lastly, total hours don't seem all that high but I'm interested in others perspectives. Again, my non-mechanic rule of thumb I've heard is that most 2-stroke outboards should have a normal life expectancy of 1500-2000 hours (equivalent of 100k miles on a car). Obviously there are many flavors - some guys blow a powerhead in 100 hours and others run the same motor w/o major repair for 2500+.
I also have the serial # if someone has access to a merc-certified diagnostic terminal.
If you can provide any advice or information that would be greatly appreciated.
Thanks,
Ryan
I'm new to the forum. I'm looking for some advice/help with a potential boat purchase. I'm looking to purchase a new boat with a 2002 200hp Optimax with roughly 490 hours. I have compression info.
Compression by cylinder.
#1 - 108
#2 - 108
#3 - 110
#4 - 120
#5 - 112
#6 - 108
I haven't been able to track down definite specs, but one related thread suggested "normal" operating range being from 90-110 psi. I questioned this given all six cylinders are near or above top threshold. Does anyone have additional information experience?
In addition, the rule of thumb I was always told was net variation across cylinders greater than 15psi is troublesome. Based on what the compression above I'm looking at 12psi variance. Would most consider that acceptable/good or nearing the point of concern?
Lastly, total hours don't seem all that high but I'm interested in others perspectives. Again, my non-mechanic rule of thumb I've heard is that most 2-stroke outboards should have a normal life expectancy of 1500-2000 hours (equivalent of 100k miles on a car). Obviously there are many flavors - some guys blow a powerhead in 100 hours and others run the same motor w/o major repair for 2500+.
I also have the serial # if someone has access to a merc-certified diagnostic terminal.
If you can provide any advice or information that would be greatly appreciated.
Thanks,
Ryan