Well here is an interesting twist...

Just spoke with Ron's and he doesn't think it was completely an oil issue. He said the VRO mixes the gas and oil before sending it to the carbs so if one carb/one cylinder got low oil they all would, which doesn't seem like its the case as I have only one bad hole. He said it may be a carb issue that reduced the fuel/oil mix to #6 and eventually fried it.

-Svence

no it was oil issue not a carb, ive lost several when the vro stops you usually only loose the last cylinder in the fuel feed for some reason. some times if it happens fast you can loose the first to get the raw fuel. but that is normal to loose only one cylinder they are only wanting to do a complete rebuild and carb job.

But why then is there no evidence of an issue in the other cylinders? I have good compression on the other five and the top two on the right looked clean when I pulled the head. The two things that I don't get is that it was only a short burst of no oil, I mean short, and that only one cylinder went and the others are perfect.

-Svence

damage
 

The reason is simple, You stopped running it before the other cylinders had a chance to destroyed themselves.

The damage normally only happens to one like SKOOLS said. I have a YAMAHA 250 that COMPLETELY lost one cylinder, yet it still ran on the other 5 and they didn't look that bad. It just proves that these engines run on a FINE line of just enough oil to live on with the VRO. If it leans out just a little, you can't predict what will happen. That fractional drop in oil though could have been just enough to finish that cylinder off, while the others escaped. If you think otherwise, look at how many MERCURY's have died on just one cylinder from the crank gear just beginning to slip.

We found the broken injection arm on my Yamaha, and also was just one cyl.

Did somebody mention PRE-MIX?:zip:

Figured these pics are appropriate to this topic. This engine was on a boat that I bought awhile back. It was a 93 MERCURY XR6 150 with the oil injection removed. The person I bought this from was 17 and had never had a 2 stroke before. The guy he bought it from told him he should double up the oil for the first tank, so he mixed it 100:1 instead of 25:1 like he was told. The other 5 cylinders were fine with 125 compression, but #2 was a DISASTER! And this was on pre-mix so no oil injection to blame, and the carbs were in tip top shape.

http://i162.photobucket.com/albums/t...0XR6cyl1-1.jpg
http://i162.photobucket.com/albums/t...0XR6cyl1-3.jpg
http://i162.photobucket.com/albums/t...0XR6cyl1-2.jpg

Have you tried Budget Boats on Battlefield Blvd. They have a good colection of used motors and they also have news motors.

Stillrunning,
Thanks for the heads up. Called them and they are fresh out of any johnrudes that would work.

-Svence