Hi guys,
I am soon to build a racing buggy in the 450cc class. Most chaps use YZ450 or KTM 450cc singles. I am thinking outside the square and have bought a crashed ZXR400 H to use the motor. Not having owned a ZXR400 before, I will be relying on your experiences here but I am forseeing the need for a stronger midrange.
What engine mods would you recommend??
How to get more midrange???
Moderator: Moderators
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- Posts: 7
- Joined: Sat Dec 05, 2015 5:18 am
- My Bike: zxr400......suprisingly
- Tirpitz
- zxr400 oc member
- Posts: 766
- Joined: Sun Dec 12, 2010 2:45 pm
- My Bike: Kawasaki ZXR400L4
- Location: Doncaster, South Yorkshire
Re: How to get more midrange???
A ZXR750
ZXR400 L4, purple / black / pink
Hel braided hoses
Pirelli Diablos
Ohlins steering damper
A16 carbon fibre exhaust can
Nitron Sport shock
Hel braided hoses
Pirelli Diablos
Ohlins steering damper
A16 carbon fibre exhaust can
Nitron Sport shock
- Dominik
- Posts: 110
- Joined: Tue Oct 07, 2014 11:05 am
- My Bike: Zxr 400 L3
- Location: Trier - Germany
Re: How to get more midrange???
In the 450cc class...
You can install 440ccm pistons, adjust the timing (earlier inlet open, retarded exhaust close), get some longer bellmouthes for the carbs and a bigger (ram) airbox. This will give you some more power at lower rpm.
All in all the zxr engine isn't designed for midrange power and you will achieve better results if you go for top end...
You can install 440ccm pistons, adjust the timing (earlier inlet open, retarded exhaust close), get some longer bellmouthes for the carbs and a bigger (ram) airbox. This will give you some more power at lower rpm.
All in all the zxr engine isn't designed for midrange power and you will achieve better results if you go for top end...
Zxr 400 SL - 130kg
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- Posts: 7
- Joined: Sat Dec 05, 2015 5:18 am
- My Bike: zxr400......suprisingly
Re: How to get more midrange???
Thanks Dominik,
Has anyone tried changing the cam timing? What was your experience??
Has anyone tried changing the cam timing? What was your experience??
- Dominik
- Posts: 110
- Joined: Tue Oct 07, 2014 11:05 am
- My Bike: Zxr 400 L3
- Location: Trier - Germany
Re: How to get more midrange???
I haven't changed the timing in my bike yet as I don't have adjustable cams (only sp models have those) and changing it by a whole tooth won't work for me.
I know that some have changed the inlet cam timing by one tooth and they achieved more midrange power so you might find something about it here.
I know that some have changed the inlet cam timing by one tooth and they achieved more midrange power so you might find something about it here.
Zxr 400 SL - 130kg