I have a 63s engine which is running perfect.Is it recommended at the end of day to burn the fuel ie. run the engine full throttle and pull off the fuel line from the engine to dry it from fuel?doesnt this harm the engine since this would make the engine run lean?Thanks.

Yes that would make the engine run lean and its not good, it can damage the engine.

If you want to run it dry at the end of the day, drain the tank and run the engine at idle to run the last bit of fuel out of it. Never NEVER run the engine dry at full power, you just have to buy a new engine.

Troy Newman
Team YS Performance

I have another question along the same line - Should I use an after-run oil in the .63?

I have heard petroleum oil can damage silicone parts in a YS, I expect the answer is no. Assuming that is correct, should ANY ARO be used?

If this is a dumb question, please be patient with me. This .63 (as soon as they reach my dealer) will be my first YS.

Thanks in advance! ...Ken

No petroleum based oils can be used. most After Run oils are petroleum based. If you don't know that its 100% synthetic don't use it.

Some alternatives to the Afterun oils on the market.

Dave Shadel sells the Ultra Oil its perfect for YS engines. www.pspec.com

and specifically http://www.pspec.com/details.asp?ProdID=40&category=7


Also you can use Mobile 1 Synthetic oil. 0W-20 is the lightest weight. You have to be careful to not get too much. It will make it difficult to start next time out...but is a very good oil to lubricate the engine with. I use it to assemble the engines.

Basically you want an all synthetic oil a light weight oil, and not too much if you choose to after run your engines.

The fuel I choose to run Cool power 30% heli fuel has a very good oil package and I never after run my engines. Now I'm in a dry climate Arizona, but I keep my models and engines in basically climate controlled. They live inside and don't go through hot and cold changes. Specifically the cold temps and humid air can lead to moister getting into the engines.

The procedure to use is run the tank dry while the engine is at idle. Keep trying to start the engine until it will not run anymore. Keep the rpms only at idle...don't throttle it up to make it use the fuel faster. You are running it lean by running it out of fuel. So keep the engine happy and do it only at a low idle.

Then add your few drops of Ultra Oil to the carb and turn the engine over a couple of times to distribute the oil. Next disconnect the fuel line from the engine and plug it. This will keep any fuel or moister from the tank from creeping into the regulator housing or the pump on the DZ engines. The engine is ready for long term storage.

Troy Newman
Team YS Performance

Cheers Troy ,that was quite helpful.I will apply this procedure to all my other engines.
Surprisingly enough, one article published In an rc model magazine has recommended that you run full throttle and pull the fuel line out to get rid of all the fuel inside the engine!

Thanks again Troy

The world is full of experts. I don't claim to be one. I just have experience with the engines and in my 26 years with model engines I would never run an engine dry at full power.

Perhaps if I did I could get paid to write articles for the magazines. I suppose I don't know what I'm missing.

Troy