engine rebuild advice...

[aussie]

that will put out your intake timing it may not push intake gases from the crank case to the cylinder bore and the rings may not go completely past the hole so i would say its junk

[reyb]

Thanks Aussie.

[aussie]

i was hopeing someone else would make a comment too but do it rite from the start it always cost alot to do it that way but in the end its cheaper than doing it twice

[spareparts]

I'd figure Skools would chime in on this thread, he's the resident PWC guy

[reyb]

Doing some research right now and one of the hurdles is the resleeving. There are some articles about putting the head in the oven(400 degrees) and pressing out the sleeve and then pressing in the frozen new sleeve in. Some people say its' relatively easy and some don't. I'm currently look at around $200 for a new top end kit(2 pistons and gaskets), $65/sleeve and $225 to install the new sleeves and bore.

[Richie Rich]

thats a cheap price for peace of mind.....i wouldnt chance it for that price...add another zero, maybe....not that

[Skools Out]

if it is like that the motor won't run if you reuse that sleeve, that sets to lower end timing on a piston port Kaw motor. i have ground them before to adjust the timing for different HP curve, you could do that but it's a ton of machine work and requires different piston timings as well. my old JS440 i have done all that to, it took about a yr to get it rebuild with all the timing working, but it's now bored to a 575 plus the compression will change alot doing that mine went from factory 90 psi to now 225 psi which then requires the crank plates to be welded or it will twist the crank. i would have the crank welded either way, if you raise the compression alot you'll need a goki hp starter to turn it over. i changed the head on mine as well which you should do while it's apart find either a Westcoast or PJS or JetSport HP head. if you do all that you will have to convert to the twin carb setup from JetSport perf parts. that's what i had to do, i went from a single 38mm carb to twin 46 mm carbs now but if you do that it requires the exhaust timing to be fixed and you must run the PJS twin 6 inch exhaust which is what mine now has. but they will fly if you do all this. mine went from a factory WOT @ 9k rpm @ 24 mph to now WOT @ 19k rpm and 87 mph, the coast gaurd clocked me whoops in a no wake zone 2 summers ago. your best plan is look on ebay and buy a used but good set of 750 juggs with some good pistons, i do have 40 or 50 sets of kaw pistons if you know what MM your bore is let me know i may have a set. as for the head change if you only change to an aftermarket head no twin carb change required, if ya need something let me know.