I've been running my new Expresscraft Thunderbolt Cat with new Quickdraw HT engine.

I've gotten it to 60 with a Prather 470, and I have a Propshop stainless 3 blade that's supposed to be a lot faster.

I've had 2 blow-overs, both times everything got wet.

I'm planning on getting the recomended "Rost Off", but until then I have removed the plug, and shot LOTS of WD40 into the engine through the carb and plug hole, turning the boat over and flushing the engine. I do this maybe 3 times, then with the plug loose I fire it up.

It blows a lot of white smoke initially, then clears out and runs fine.

The silencer is packed with insulation that absorbs a LOT of water. Won't water get blown back into the engine unless the silncer is allowed to dry out?

At the race I went to, blowovers seemed commonplace, and everyone had no problems simply flushing and refiring.

I've removed the engine and pipe and cleaned everything up, drying the silencer.

Is there anything else I should, or shouldn't do after I get the engine/pipe wet?

First off you need to be aware GAS engines are a bit different that their Nitro counter parts.

* Nitro/Alki fuel is hydroscopic, In other words the Alki & water mix and are drawn to each other making flushing out after a dump easy as pie : ..... Choke LOTS of fuel in, then cranking over gets the water out.

* Gas & water DO NOT mix however and when you get water in it either has to be run a few min's at WOT to digest & dry it out with heat ... Or, Engine removed from boat & flushed heavily with water displacing oils and then placed near or on a heat source to evaporate it out of all the nooks & crannies.

If at the pond & engine gets wets, in most cases all you need to do is remove spark plug, turn boat up side down with pipe & cylinder pointed down & crank it over 20 or so times blowing out the water, Then with plug still out choke it a bunch more, turn over again blowing out all the excess fuel. Replace plug, hold throttle at WOT & crank on it, it should fire up pretty quickly. If not remove plug and make sure all the water & excess fuel is blown out !!

If a gas engine gets wet & you are done running for the day, a simple flushing with WD-40 or oil WILL NOT get the water completely out
Water will be behind the piston ring, in the bearings & around the crank seals .... Rust WILL HAPPEN and engine will be short lived.

** I have always taken wet engines out of the boat, flushed them out and placed them right next to a 100 watt light bulb with piston at BDC and no plug .... For at least 12 hours !!
This close contact with the 100 watt bulb will heat up entire engine over 200* and will evaporate the water from all the nooks and crannies.

JMHO,
Scott

When i have a blowoff, i do just what scott said... pull the plug out, tip the boat upside down and pull over til i dont see water coming out anymore. Then i put the plug in just finger tight, pulling over will leak a little compression out at the plug. Fire it up and tighten plug, throw it out into the water and run it hard for a few laps.

When i get home, i pull the plug and squirt some Corosion X in through the plug hole and through the carb and pull it over a few times, put plug back in and let it idle til it gets a little heat in it. Let it cool down, pull plug and squirt another shot or so of Corosion X in the cylinder, pull it over a couple times and let it wait til the next outing.

Thanks for the replies.

Today I set up a jug of water so I could run the boat at home, and after flushing the engine I ran it for a couple minutes revving it a bit. I got some heat into the engine, but no WOT action.

I have the engine removed now, so I'll do as suggested and leave it next to a heat source to dry out.

I drilled a 1/8 inch hole in the lowest point in the silincer, and all the water drains out.

JMHO