new guy here looking for help on my js440 build?

gilby1987 · 07-13-2007, 01:56 PM

just wondering if anyone has any old parts or sugestions on souping up my all stock 1989 js440

alexk243 · 07-13-2007, 02:04 PM

get and aftermarket exhaust, best upgrade in my opinion

yamanube · 07-13-2007, 02:54 PM

Ive got a 440 topend that has been ported and polished with pistons, not sure if you are looking to do that much work. Otherwise, yeah get a pipe, and mill the head down a bit to get a little higher compression. I wouldn't do much more because putting a 550 engine will end up being a more cost effective way for easy HP.

Coreyf983 · 07-13-2007, 03:00 PM

rideplate, intake grate, and a stainless steel impeller would help. Welcome!

wavejumper800 · 07-13-2007, 03:02 PM

I'm not sure what your looking achieve or how much your willing to spend to meet your goals but as Alex mentioned a pipe would certainly help.
To take it a step furthur, a "prop" is a must. Putting in an after market prop will give you much better pick up and throttle response.
A "scoop grate" will assist the prop and help prevent cavitation.
Another inexpensive tip would be to "plain" the factory head.
On a stock head - you can probably remove .030 (30 thousanths) of material - boosting compression greatly. That would surely make your 440 feel more powerful and responsive. (Be sure to replace the head gasket - it's never a good idea to reuse gaskets) Work clean. Watch out for sand and grit falling into the cylinders.
Between the head, pipe, prop, and scoop grate - you should find a big difference from the stock ski.

gilby1987 · 07-13-2007, 04:44 PM

does anyone have a 550 motor or parts they wanna sell for my 440?

Minnetonka4me · 07-13-2007, 04:51 PM

welcome, we have a big get together next weekend on the Croix...try to get out there!

gilby1987 · 07-13-2007, 04:59 PM

o i will be there maybe this weekend too

gilby1987 · 07-16-2007, 02:41 PM

still looking for any parts that will help my 440 pick up a little better in the rough water of the croix before the big meet on the 20-22

djyox · 07-16-2007, 09:02 PM

I got ride plates, and a few other goodies. I don't know how bad I want to sell, but I can let some stuff go...

Do you have an aftermarket rideplate? its longer, and the ones I have have fins on the bottom to help it from sliding out (you can still slide it out though if you want)...

I also have an aftermarket waterbox that will not really help it out much now, but once you start putting some real power behind it will let it open up.

I don't know what else I got I have to look.