T/b 165cc v2 race head - Kawasaki Z125 Forum
 
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post #1 of 8 (permalink) Old 08-11-2019, 01:12 AM Thread Starter
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T/b 165cc v2 race head

I just installed a Tb parts 165cc top end kit on my z today, going to play with the tune tomorrow, how high are y’all reving the v2 race head kit?
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post #2 of 8 (permalink) Old 08-11-2019, 12:45 PM
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i just installed a tb parts 165cc top end kit on my z today, going to play with the tune tomorrow, how high are y’all reving the v2 race head kit?
12k.
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post #3 of 8 (permalink) Old 08-11-2019, 02:31 PM Thread Starter
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Thanks!
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post #4 of 8 (permalink) Old 08-11-2019, 04:12 PM
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@Phil looks like I can go another 1K
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post #5 of 8 (permalink) Old 08-11-2019, 04:46 PM
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I just installed a Tb parts 165cc top end kit on my z today, going to play with the tune tomorrow, how high are y’all reving the v2 race head kit?
Depending on what other parts you are running(stock vs. larger throttle body, std TB cam or larger, etc) your peak power is usually around 10.5K or 11k RPM in my previous dyno experience. So revving it much beyond that doesn't do much. But if you can actually rev it out that far in top gear, then your top speed will be higher. But you need to put it on a dyno to see where your engine's power starts to fall off. Here's a stock Z125 curve versus a modded 173cc 91 octane motor. No point revving it past 11k.
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post #6 of 8 (permalink) Old 08-11-2019, 05:32 PM Thread Starter
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It’s stock throttle body and the v2-1 cam, I just got back from a mountain ride, super impressive how it runs compared to the high compression setup I had, it hits a wall about 10,500

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post #7 of 8 (permalink) Old 08-11-2019, 08:29 PM
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Originally Posted by Ls13ater View Post
I just installed a Tb parts 165cc top end kit on my z today, going to play with the tune tomorrow, how high are y’all reving the v2 race head kit?
Depending on what other parts you are running(stock vs. larger throttle body, std TB cam or larger, etc) your peak power is usually around 10.5K or 11k RPM in my previous dyno experience. So revving it much beyond that doesn't do much. But if you can actually rev it out that far in top gear, then your top speed will be higher. But you need to put it on a dyno to see where your engine's power starts to fall off. Here's a stock Z125 curve versus a modded 173cc 91 octane motor. No point revving it past 11k.
Yea it def depends on the setup you run with that head. The set up I run I benefit greatly from shifting at 12k. I don’t get a massive drop in power after peak like the dyno you posted so I run it to 12 and when I upshift the next gear is closer to peak power instead of having to build up.
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post #8 of 8 (permalink) Old 08-14-2019, 08:44 PM
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Yea it def depends on the setup you run with that head. The set up I run I benefit greatly from shifting at 12k. I don’t get a massive drop in power after peak like the dyno you posted so I run it to 12 and when I upshift the next gear is closer to peak power instead of having to build up.

18+ RWHP, I'd like some of that action

Phil
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2018 Z900RS
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