07/12/2026
Garrett brought me this tri-toon with a 200 Mercury 4 stroke on the tail. The reason he brought this big Betty in was because she was not showing a tell tail and while throttling up she would shake, but in idle she would just purr. After getting the tell tail back I dug into why the motor would shake while RPMs climbed. I hooked up my techmate pro and 1st checked my alarm horn to make sure the horn was working. From there I moved to alarms. It has zero alarms. I moved to test functions, I tested injectors and they all passed. I then put water on it and went to drop test. 1,3,4,5,and 6 all dropped the motor. Cylinder 2 has ZERO change. I then pulled all the plugs and did a compression check. All cylnders were in perfect range. I moved in the shop and tested all the spark plugs. All thw plugs except the plug that came out of cylinder 2 fired on the stand. I decided to put them all back in swapping cylinder 2 and 4 for my last test even though the stand results showed my problem. I fired it back up and went back to drop test and the problem followed into cylinder 4. Which confirmed my test stand on the plugs. I ordered in all new plugs, gapped them to the manual and installed. I put the computer back on and fired it back up. She sounded even better and all cylinders reacted to drop test.
Thank you guys for calling and getting this big Betty in. Thank you guys for trusting in me to keep the fun on the water.