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Discussion Starter #1
I just did 2 race seasons with my 16 Zx10, about 5000 track/race miles. The motor is still very strong, I don't think there has been any drop of performance, at least my lap times don't say so.
Should I jump on a 3rd season or rebuild the motor? Any of you guys have experience with that many track miles and how well these motors hold up?
 

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i would run a couple of tests to verify engine condition/performance. pull the oil pan to check for any bearing material, always a good thing to do anyway to clean out any clutch material. check compression balance, and leakdown test to check ring/valve seal. all within limits, go racing with confidence.
 

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My gen 4 at 4,000km needed all new valves. There’s no warning, the top end will all of a sudden sound like shit.

My rebuild schedule is bottom end every two years and top end every two years alternating so it’s not one big bill at once. Stretching it out until failure will result in a single very large repair bill. Good luck.
 

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Discussion Starter #6
Cool thanks guys, sounds like I'm going to pull this engine apart and just do it. The only thing now stopping me now is Kawasaki won't pay out anymore because its a 2016 and I need a 17 or newer. Considering I podium almost every race the contingency pays for pretty much all my racing fees/tires. Decisions....
 

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My gen 4 at 4,000km needed all new valves. There’s no warning, the top end will all of a sudden sound like shit.

My rebuild schedule is bottom end every two years and top end every two years alternating so it’s not one big bill at once. Stretching it out until failure will result in a single very large repair bill. Good luck.


I plan to do a full rebuild on my zx10rr at about 4000km, the Thai Kawasaki Sbk team changes valves every 2000km.

If you keep the engine completely stock then they seem to last pretty good but once you add a little extra (race cams) then they don’t hold up so well. My teammates just had to have their BSB spec engines completely rebuilt, one lasted just over 4000km and the other bent a valve just under 4000km.



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I plan to do a full rebuild on my zx10rr at about 4000km, the Thai Kawasaki Sbk team changes valves every 2000km.

If you keep the engine completely stock then they seem to last pretty good but once you add a little extra (race cams) then they don’t hold up so well. My teammates just had to have their BSB spec engines completely rebuilt, one lasted just over 4000km and the other bent a valve just under 4000km.



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Wow, so shimming the valves isn't enough, actually need to replace the valves completely?
 

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Wow, so shimming the valves isn't enough, actually need to replace the valves completely?


If it just a bike you use on the road and occasional trackday then no but these are racebikes only I’m talking about. One of the top Superstock racers here has 2 full race seasons on his but we’re not sure what was serviced on it during the first year as it was Kawasaki Thailand Superstock Bike. But most guys are doing preventative maintenance and 4-6000km rebuilds.

The top Superbike guys are running under 3s off Rea’s best race lap and Superstock are about 4-6s, so the pace is pretty quick.

For comparison the Yamaha Thailand Team changed atleast 2 new engines in their Superstock R1 this year and even more last year. Last year they had issues with bent valve on the stocker and Sbk engines, which is why they’ve upgraded the valve springs on the 2017 R1.

I'll ask the Thai mechanics why they change the valves so quickly cause it does sound to quick to me, personally i probably wouldn't change the valves until the 2nd rebuild at about 8-10,000km. On the S1000rr HP kit 1 engines they recommend new valves at 18,000km.


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My 195hp gen4 with 11,000km street + 7,000km race.
Have just replaced first two valves, one with failed collet groove, second just needed adjusting for second time.
Otherwise just minor shim adjustment needed for 5 valves.
I check valve gaps after every two full days at track and keep record what was adjusted.
 

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The hardened coating came off my valve. If I had of shimmed it to correct tolerance the top of the valve would’ve worn down to the groove and then it would’ve gone into the combustion chamber. No way I’d replace just one. If ones gone bad the others aren’t far behind and that’s a gamble I’m not willing to take.

My season is about 2000km, not a lot. Motor comes out every season and full tear down to the frame for grease and inspection. Watch what the top guys do and do it. There’s a reason why they’re there.
 
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