kawasaki flat top pistons in seadoo 787

[holmes99]

i am just wondering if anyone could chime in on kawasaki pistons in the seadoo 787 engine. I am trying to figure out the best of the pistons to use.
I am aware that the head is different.

If anyone could chime in and guide me in the correct path way.

thanks again

[TMali]

Re: kawasaki flat top pistons in seadoo 787

The best in my opinion for PWC

http://www.ebay.com/itm/Pro-X-Piston-Kit-25mm-Seadoo-787-01-5511-025-/291476871149?hash=item43dd6017ed&vxp=mtr

[TheJS440]

Re: kawasaki flat top pistons in seadoo 787

Better than WSM?

[wmazz]

Re: kawasaki flat top pistons in seadoo 787

Probably not important, but when I changed from stock dykes rings
to thin keystone rings I lost 10 psi. I don't know about the thick WSM
rings.

[mandriva]

Re: kawasaki flat top pistons in seadoo 787

i am just wondering if anyone could chime in on kawasaki pistons in the seadoo 787 engine. I am trying to figure out the best of the pistons to use.
I am aware that the head is different.

If anyone could chime in and guide me in the correct path way.

thanks again

Yes you could!! I build many big bore artic cat 1132cc with piston yamaha...if the chime is right ..no issue....

Next projet..i will build a big bore 787 to 840cc seadoo with piston gp760 (85mm)..

[ric rude 716]

Re: kawasaki flat top pistons in seadoo 787

i am just wondering if anyone could chime in on kawasaki pistons in the seadoo 787 engine. I am trying to figure out the best of the pistons to use.
I am aware that the head is different.

If anyone could chime in and guide me in the correct path way.

thanks again

I use Wiseco kawasaki flat top pistons, and billet rossier head with flat domes in both my race boats. You will have to deck clyinders to get your squish right, ( 50-55 thousands ) if you dont the squish will be around 225-250 thousands. Rick Nolan

[twk4spd]

Re: kawasaki flat top pistons in seadoo 787

I have a question about your question ---> WHY?

[holmes99]

Re: kawasaki flat top pistons in seadoo 787

flat top pistons produced better torque than a dome piston. And it is also something different to try.
The fastest boat in my 800 open division is a 787 with kawi flat top pistons and it destroys everyone. And it is not just the rider

[mandriva]

Re: kawasaki flat top pistons in seadoo 787

flat top pistons produced better torque than a dome piston. And it is also something different to try.
The fastest boat in my 800 open division is a 787 with kawi flat top pistons and it destroys everyone. And it is not just the rider

really?? Flat top pistons is better?

[88kawi5fiddy]

Re: kawasaki flat top pistons in seadoo 787

flat top power depends on the porting, a lot to do with roof angle and direction. kawi flat tops are 2 deg, the only true 0 degree flat tops i know of are riva dominator flat tops. they are around 200 a piece from wiseco.

go read waxhead's 1100 blaster build he goes over all of this. or google flat top pistons pwctoday or flat top piston greenhulk

[mandriva]

Re: kawasaki flat top pistons in seadoo 787

Great !!

[twk4spd]

Re: kawasaki flat top pistons in seadoo 787

If I decked the cylinders according to your numbers there would be no going back with those cylinders so it's an all in thing. I'd have to see a doo run with that setup before I could commit. Seems a lot of port work would have to be done. Those piston must be out of something with a shorter stroke and usually a mod to increase in one part of the power band results in a decrease in the other, I could see how more torque in a closed course race ski could be desirable but not sure I would chance losing rpm and top speed that's also used to do rides like Havasu to Topoc and farther. Who knows, I may have a KawaDooki next year. {;o) Lee

[88kawi5fiddy]

Re: kawasaki flat top pistons in seadoo 787

Lee, you're asking the wrong pwc question! It's more like.... WHY NOT? hahah. Crazy fleabrained ideas sometimes make good results such as the Tpe engines. Although he used other two stroke engine designs

[sea_doo_man]

Re: kawasaki flat top pistons in seadoo 787

Does anyone have any experience building 787 Flattop who can share some details?

[mandriva]

Re: kawasaki flat top pistons in seadoo 787

Hi, what is engine piston kawasaki who fit on rotax787?
Gp760? Do you need a chime?