The main thing I would do would be to pull the upper yellow stripe through to the front and loose that wavy top of the red. Maybe even have it overlap the triangle so it all pulls together.

What about black to tie into the black at the base of the windscreen sides?

What about getting rid of the triangle, straighten out the waves in the red and bringing the red up onto the rear above the rail and do something other than the yellow like glassdave suggested.
The triangle looks liike someones after thought to me

Whatever color you go with over the blue, I would extend the lower corner of the triangle forward onto the hull to form a separate stripe running along the bottom edge of the hull and then terminating about halfway. That would offset the stripes above it and look less like an afterthought. You could even keep the blue if you did this, or go with something like a purple or orange.

I agree with getting rid of the waviness along the red stripe, and I'm not a big fan of "ketchup and mustard" either, but by the time you do all this, you might as well just wrap the whole side of the boat and do something completely different.

Looking better!

Nice work, ridefast. Might look good with a checkered flag motif worked into the stripe, although that is becoming a bit passe' in some opinions.

+1 on ridefast's idea

Turn yellow into black & that would help!

i was thinking that to but im sure he's not trying to repaint the hole boat