04-26-2014, 07:39 PM #1
Why u should upgrade ur flywheel bolts when running big boost and rpm
I have done 140hrs of ocean bashing on my RXTX S3 ...
Been running my Spark for a while and was GOING to change out my OEM flywheel bolts on the RXTX as have seen too many bolts shear ...
Running 8800 tune with XXX SC and this happen yesterday :
Bolts sheated off in crank inc locator pin , charging mag toasted ... Looks like another RXTX project coming up ...
So pi..ed off , as i been riding the Spark and left the RXTX out till i pulled the motor and changed them out ... But wanted another ride ...
04-26-2014, 08:08 PM #2
Oh man sorry to see this. I'm hoping my ARP bolts solve this problem for me.
how the rest of the motor look?
04-26-2014, 08:32 PM #3
- Join Date
- Mar 2006
I have a couple mint stators for your machine. If you need 1-- $195 + paypal fees shipped.
pm me if you like.
04-26-2014, 08:34 PM #4
Been there too bro, changed my bolts out as well.
04-26-2014, 08:53 PM #5
that so sucks, to see, I dont understand why Seadoo has to be how do I say this, overkill on not doing what everyone else does, makes no sense, Im starting to think its not the bolts but just one vibrates loose well there you go, I really think they need to take a step back and go with the large nut and half moon pin, and we would not have this issue, dont know if this would work but have a 185 stator thats good, if it will, $100 shipped
04-26-2014, 09:29 PM #6
Never had problem , been bullet proof this ski ...
rest the motor fine , but!!! I am going to strip it , balance it and get it ready for a turbo kit ...
04-26-2014, 10:23 PM #7
Ive been there too. Big SC, high RPM, unhooking, IMO all to much for the setup. Its a shit design IMO. The threads in the Crank gear are counter sunk, from memory 3-4mm, which is quite a lot when you consider the bolt length. Often performance setups that are countersunk to that extent have a matching shoulder bolt where the head of the bolt is un-threaded and sized to suit, so it takes up the unthreaded portion at the head of the bolt better and allows the bolt to take the stress. With the Rotax setup your relying on one small dowel pin and the bolt shear strength.
I would assume Rotax left the countersunk thread to retain any thread locker and stop it getting between the flywheel and gear and causing fitment and balance issues. I had this issue with 1.6L that was doing 9k+, the smallest amount of thread locker between the gear and flywheel and it spat the flywheel through the gearbox, all over the main straight at Phillip Island Race Track.
I think they over did the countersunk depth in the crank if its just to retain any excess threadlocker, I would be thinking that this is enough to cause the bolts to flex and eventually let go. Especially when you have the mag hanging off it also.
Obviously this is not a massive issue as its not that common but IMO the OEM setup could be better.
04-27-2014, 04:00 AM #8
Make sure you don't end up with a miss match stator and mag set. Even though the part numbers are the same they changed manufacturers at some point and then back to denso. They are not the exact same size. They will interchange one way, but not the other. The stator does not even fit in the mag.
I have stator, mag, FW if you need.
04-27-2014, 04:32 AM #9
Yeah i found out already ...
I call yah Sayers for the parts if i need it ...
04-27-2014, 04:36 AM #10
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