Struggling above 8000 rpm

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matthew
Posts: 81
Joined: Mon Mar 02, 2009 8:07 pm
My Bike: zxr400

Struggling above 8000 rpm

Post by matthew » Tue Apr 04, 2017 9:58 pm

Hi folks...bit of help needed..my race bike really struggled with revs over 8k..carbs have 108 main jet in and standard needles...that's all I really no about the carbs...anybody give me any pointers
Cheers matt

matthew
Posts: 81
Joined: Mon Mar 02, 2009 8:07 pm
My Bike: zxr400

Re: Struggling above 8000 rpm

Post by matthew » Wed Apr 05, 2017 6:51 am

Bike has ram-air and belmouths fitted with a slightly tuned engine

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banner001
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Track day God
Posts: 2496
Joined: Sat Sep 24, 2011 3:27 pm
My Bike: ZXR400 L4
Location: Nuneaton

Re: Struggling above 8000 rpm

Post by banner001 » Wed Apr 05, 2017 10:50 am

way too lean for ram air setup, do you have blanked air jets?

im on normal carbs, normal airbox and ive got 105's in.

i would get some bigger jets, maybe 115 and 120 and see how they go, when it bogs have you tried giving it some choke, whats the result?
UK ZXR400 L3 (1993) - Fully restored and on the roads, my green beast!
JPN ZXR250 A2 (1990) - Revs to 19,200rpm... 'nuff said :smt003

matthew
Posts: 81
Joined: Mon Mar 02, 2009 8:07 pm
My Bike: zxr400

Re: Struggling above 8000 rpm

Post by matthew » Thu Apr 06, 2017 5:26 pm

Air jets are blanked off yeah... Will order some bigger jets and give it a try..not tried use the choke while racing it no
Cheers for the advise mate

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