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Old 01-18-2013, 11:46 AM   #1 (permalink)
KHB
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Default 1989 JS 440 advice

Hi all, I have a 440 that is in need of an engine rebuild and I am looking at my options. I am considering upgrading to a 550 motor in the hull. I am also looking at a reman engines that SPT offers. The ski is stock with the exception of a west coast pipe. I realize I will probably have to improve the intake side if I go up in displacement. Additionally, I am not against rebuilding it as a 440. I am looking for advice. I know there are hull and pump differences and probably more than I am thinking about. I am a recrational rider and I want reliability. Sure a little extra power is alway nice, but is it worth the effort?
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Old 01-23-2013, 10:16 AM   #2 (permalink)
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Default 440 kaw

Hello
The 440 to 550 upgrade is an easy swap, you will need a yamaha 650 carb cause the stock 550 carbs are garbage and you will need to make a spacer plate about 3/8" thick I make them out of a piece of plastic or aluminum between the intake manifold and the jugs. Also you should be sure to install a stainless prop in the 440 pump I would not change the pump the 440 is actually better.
Thx Mel
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Old 03-18-2013, 12:06 PM   #3 (permalink)
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Quote:
Originally Posted by melscharf View Post
Hello
The 440 to 550 upgrade is an easy swap, you will need a yamaha 650 carb cause the stock 550 carbs are garbage and you will need to make a spacer plate about 3/8" thick I make them out of a piece of plastic or aluminum between the intake manifold and the jugs. Also you should be sure to install a stainless prop in the 440 pump I would not change the pump the 440 is actually better.
+1 to that. I was able to use the 440 carb on my 550 engine when I did the swap. I had to tweak the mixture settings a little but I've had 0 issues with since.
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-1984 JS550 clone - restored, 440 pump, Skat Trak, primer, thumb throttle
-1987 JS550 - bone stock
-1985 JS550 basket case
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