Thread: Fzr-broken timing chain
05-03-2011, 12:36 PM #1
Fzr-broken timing chain
Well it never ends, my 54hour FZR was running great, no more clutch issues, rotax clutch doing its job then, Sunday @7000RPM it just died, no strange sounds. Got it back on the trailer, pulled the valve cover and the chain was gone.
I figure this is related to my clutch failure, some debris might have streched the chain although when I inspected there was no signs of damage??
Going to pull the head tonight, do you guys think it touched down?
05-03-2011, 01:54 PM #2
05-03-2011, 02:24 PM #3
I am running the stock valve springs turning 8300RPM with a R2.
Do you ever see damage to the valve guides?
05-03-2011, 03:48 PM #4
Wow. That really sucks. First I have heard of a broken timing chain. Hopefully it's all laying in the bottom and didn't break apart sending pieces all over.
05-03-2011, 03:53 PM #5
05-03-2011, 03:54 PM #6
only broken timing chains i have seen and heard of have been after people have had the cam tensioner out and have incorrectly reinstalled putting too much tension on the chain eventually in just gives up and snaps
05-03-2011, 05:21 PM #7
It's not a interference motor so don't worry about bent valves.
Also you do not need to pull the head to change the chain.
05-03-2011, 05:22 PM #8
Damn...sry to hear that man. Well with the power your making.....and the rougher riding you guys submit ur skis to in the islands....your pretty much giving that thing a beating that alot of other skis wont see...a worst possible scenario with very fast rates of accel/decel during pump unhooks and re-hooks.
As I'll be beating mine up offshore as well....thank you for sharing this and putting it on my radar. Maybe a heavier-duty chain will be developed sometime in the future.
Hope your up and running again soon.
05-03-2011, 07:29 PM #9
I'm still trying to figure out how but something similar like this happen to my ski just with alot more damage. We think it's due to over revs though. Apparently my valves floated and idk how it happened but the timing chain, head, cams, valve guides, valve seals, cotter valves, lifter valves all got damaged when it happened.
05-03-2011, 08:11 PM #10
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