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Solving the split cowling problem on the BF 200 and BF 225.

chawk_man

Silver Medal Contributor
I think I’ve finally solved the problem with the split in the upper cowling failing to seal properly, allowing water to get into the bottom of engine compartment. See attached pictures. It requires the purchase of a 304 stainless steel spring latch – B006IHW06Q. If you do an Internet search on that item number you will see it on Amazon for $19.45.

https://www.amazon.com/Stainless-Spring-Loaded-Polished-Locking/dp/B006IHW06Q

From the pictures, it should be obvious how this works. The spring load on the latch pulls the two halves of the cowling together, forcing them to mate as intended and keeps pressure on them to stay together.

Be careful about mounting – measure and mark closely. The bottom hole for the vertical piece should be just above the support rim inside the cowling, allowing space for the SS flat washer. I used #5 X 12 mm metric SS pan-head screws. (A bit longer is OK.) The screws should be secured on the inside of the cowling with a SS flat washer, a SS lock washer, and a SS nut. You don’t want to make this extremely tight, because it will likely warp the cowling over time. I figured I wanted the springs to be about half of their total compression play, and located the vertical latch accordingly.

Boat latch CLOSED Closeup - Copy.jpgBoat latch Latched ready to close - Copy.jpgBoat latch OPEN Closeup - Copy.jpg

If for some reason this fix doesn’t prove permanent, I’ll post the reasons. But I see no reason why it would fail over time. Hope this helps all those owners out there who have been frustrated by this problem. Now, I wonder why Honda engineers didn’t come up with this simple fix.
 
Thanks for the compliment. It's what happens when you retire and your mind wants to keep solving problems.:eek:

In my post I spec'ed #5 SS metric screws. I think SAE 3/16" will also work. It's important to make sure that the screws are as tight as possible in the latch holes so it doesn't shift position.
 
BTW - the reason that my Intake Air Bypass Control (as explained in a different post) is that salt water got into the bottom of the engine compartment through this opening, causing the mechanism to corrode and seize.
 
The seam has a tab on the starboard side and a slot it fits into on the port side. When mated together correctly, the are fairly water tight.

So far, the spring latch fix is working perfectly. A full season of fishing will tell the whole story.
 
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