Definitely sounds like KIPS rattle to me but to the extreme. I would pull the pipe so you can see the operation of the sub-valves/flapper and operate the KIPS by hand to see if everything is moving correctly.
That will only tell you that the mechanism that drives the KIPS valves is working but doesn't show that the valves themselves are.
You'll have to pull the pipe, look up in the exhaust port, and move by hand that little plunger you see popping out in the video, and see if all the valves are actually moving.
Thanks for your quick reply. Have u seen the video behind the link of my last post? There you can see my KDX were i habe pulled the pipe and i am moving the kips
Laurenz_KDX200 wrote: 02:23 pm Apr 11 2022
Thanks for your quick reply. Have u seen the video behind the link of my last post? There you can see my KDX were i habe pulled the pipe and i am moving the kips
Good deal. didn't see it in the video but did you make sure the right subvalve was working also? If so, KIPS is good to go! However, checkout kdxazz's videos about the KIPS rattle: viewtopic.php?f=77&t=25522 and viewtopic.php?f=77&t=25525 While I do disagree with parts, he does cover some things that should be checked if you have excessive rattle from the KIPS and ways to fix it.
Also check compression. My son's KDX was rattling pretty bad. I assumed it was the KIPs but when I tore the engine down, the KIPs wasn't even connected! The little actuator pawl ( the one that is secured with the nut with left hand threads) on the right side was not even contacting the KIPs main shaft. His top end was just that wore out.
Worn top end. Piston was bouncing around in the cylinder. Combination of worn bore, worn piston, and worn rings. Glad I caught it before the piston shattered. Just got the cylinder back from replating yesterday. Plan on starting reassembly this weekend if everything checks out ok. My own KDX was getting a little noisy too. I rebuilt it last year including a cylinder replate and it is nice and quiet now.
Ah f**k, i was hoping to leave the top end untouched, so i mustn‘t buy new top end gaskets… i have this compression measering tool in the picture below… how much psi should my KDX have to know that everything is fine inside the top end?
Is it possible to re-use the Gasket of the Cylinder Head?
Ps.: thank you all for your advices :)
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