smokeysevin
Novice Class
ZX12r-STX15f hybrid motor
Posts: 82
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posted April 07, 2010 12:06 PM
1498 cc STX-ninja Hybrid motor
Hey guys I am building a 2005 stx15f jetski but i am running a bunch of ninja parts in the motor,
so for all of you big bore guys what do i need to look out for since this is just a lazy stroked out zx12r motor
the bore is the stock 83mm with a 69.2mm stroke.
the current stock zx parts I am using are
2000 zx12r throttle bodies
2000 zx12r cams
I also have ferrea stainless stock valves and #65 carpenter valve springs and a ported cylinder head I'm running a uni filter on each throttle body
2000 a1 model ecu and wiring harness
with the BDM mod so i can tune it.
the compression ratio in the motor right now is 10.6 to 1 but i am planning on either running the je 9.8 to 1 turbo pistons that would put me at around 12 to 1 with the longer stroke. Or my other option is to use the stock 10.6 to 1 pistons and run without a base gasket or a thinner head gasket. to get it up to around 11 or 11.2 to one. naturally i will check for valve clearance. but I want to keep it pump gas safe 91 octane because if i need to fill up on the water i want a margin of safety.
the only other mods I am running are 38 pound fuel injectors from an ultra 250x jetski at 50 psi to get them up to 41 pounds that will let me keep the injector pulse width the same. Im not planning on running a PCIII or anything like that.
I am planning on dropping the rev limiter to 8400 with the stock ski pistons or 8700 for the forged ones.
If yall have any advice for me that would be great, i haunt here frequently but this is my first post.
Thanks
Sean
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1498 cc
69.2mm stroke
83mm bore
  
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