Had compression check done...motor ran very weak after that

[nebraska_woody]

Hi all... I had a question. I had my 89 johnson GT200 in the shop, and they did what they called a "leak down test" for the compression. They never told me anything different, but after I got the boat in the water after that, the motor ran very weak like it was only running on partial cylinders or something.. and not all of them. The motor is weak anyway with around 75 psi per cylinder, but even this was weaker than i'm used to. I could only get around 40 mph top speed where i'm used to 50 mph before the test. Can someone tell me if the plugs should have been replaced after they did the test? seems not all plugs were firing, or what the deal could be on it? Thanks

 

[Chinewalker]

Re: Had compression check done...motor ran very weak after that

It's possible they dinked a plug with the plug wrench or didn't replace all the plug wires correctly.... The test itself shouldn't diminish performance in any way...<br />- Scott