Gen 4: 2011-2015 Head work - Kawasaki ZX-10R.net
 
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post #1 of 9 Old 12-05-2014, 02:15 PM Thread Starter
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Head work

Having some head work done on a gen 4. Plan on decking the head .010" and also running a .045" head gasket. Going to have minor port work done. Mainly smoothing the bowls and port matching intake boots, removing excess valve guides from ports. Just curious on our ptv clearance. Will be running stock cams and stock cam degree numbers if possible. Any info will help.

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post #2 of 9 Old 12-05-2014, 02:32 PM
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Never been on a G4 but if you could swing doing cams it would really help out the port job. All the other stuff is great but when you add in cams/new cam #'s you really get the bang for your buck outta the engine. Just my spare change. Would look into some cams if you can swing it, heck even if only the intake. Sounds fun though.

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post #3 of 9 Old 12-05-2014, 08:27 PM
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If you do the kawi kit cams, just use the intake. Apparently the exhaust kit cam is useless.

Please tell me you did a baseline dyno pull before doing the engine work? I really want to see somewhat accurate before and after results.

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post #4 of 9 Old 12-09-2014, 03:20 PM Thread Starter
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Yes the bike made 174 with a arrow slip on. Ill will post results soon. Thanks

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post #5 of 9 Old 12-09-2014, 04:53 PM
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^Sounds great, thanks!

Have you thought about maybe decking it more than 10 thou? I think you can get 20 to 30 thou off of these heads, but I could be mistaken.

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post #6 of 9 Old 12-09-2014, 08:20 PM
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Originally Posted by stretched10R View Post
Having some head work done on a gen 4. Plan on decking the head .010" and also running a .045" head gasket. Going to have minor port work done. Mainly smoothing the bowls and port matching intake boots, removing excess valve guides from ports. Just curious on our ptv clearance. Will be running stock cams and stock cam degree numbers if possible. Any info will help.

Keep in mind when you deck the head you are limiting where you can degree the cams a bit because you are giving back some of your PTV clearance. When I done my Gen1 (Ported head and thin gasket, STD deck) I couldn't put the cams exactly where I wanted to put them because of the lack of PTV clearance. I don't know anything about a Gen 4 head or cams other than the Gen 4 has larger cam buckets on the intake side that allows for a much larger cam than the other 3 Gen's could run. That's one of the largest advantages to the Gen 4 head that I've learned. I'm not sure what PTV numbers you can get away with according to Kawasaki's race manual you can run these things tighter than I was comfortable with doing. I used the tried and true .040 intake and .080 exhaust PTV numbers and felt safe that a missed shift wouldn't tag a valve.. Do yourself a favor and spend some money on some good springs and retainers while you're in there it's money well spent especially if you are raising your RPM's by hacking the ECU. My Gen 1 made 174 with the head, intake cam and head gasket mod along with the normal bolt on parts.. A gen 4 should make a lot more from all I've ever heard.. I hope this helps at least some..
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post #7 of 9 Old 12-09-2014, 08:36 PM
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gen 4 springs are totally different from any other gen. good seat pressure with strong retainers. ti int. valves can run a little tighter than gen1 and 2 with tool steel valves. think u will find .015 deck about max without sinking int. valves, that gets it right to the stock valve seat. .015 will work and allow degree. valve cover head surface and deck are not parallel from factory, angle milled so head must be indexed to correct angle to be milled. should run good with u doing the work.

Last edited by gazx10; 12-09-2014 at 08:44 PM.
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post #8 of 9 Old 12-26-2014, 09:54 PM
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Who did the angle mill and what where the gains

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post #9 of 9 Old 12-27-2014, 10:30 AM
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pm'd u.
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