ZX9R flat spot 6-7k

[Snorty]

So I have been stuck riding my ZX9R (not that it's a displeasure, I just don't want to ride it on shit days).

I've noticed it has a flat spot between 6 and 7 thousand RPM. Seems to be a dip in power compared to before and after. It has a micron slip on exhaust which may be the cause.

Been thinking about getting it Dynojetted - do they customise the jets for the state of the bike or is it a one kit fits all sort of thing per bike?
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Current: Yamaha FZ1 '07 | GSXR 750 SRAD

Past: CB125TDC | TZR125 | GPZ500 | CBR600F3 | ZX9-R | GSXR1000 K4

[GeorgeB.]

I could be completely off the mark, but maybe clean the air filter?

My friend's bandit had a flat spot, cleaned the air filter and bingo, no problem.
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Current: '99 Fazer 600 | '99 Range Rover P38 4.6 HSE
Previous: Keeway TX125 | CBF 125 | CB400SF Project Big One
CBT 04/12/12 | Theory 03/12/13 | MOD 1 06/01/14 | MOD 2 13/01/14

[G]

Definitely start by cleaning out the carbs and cleaning/replacing the air filter.

[Snorty]

Carbs have been cleaned so it's not that. Could well be the air filter. I wonder if *this* is a stock item at any bike shops.
____________________
Current: Yamaha FZ1 '07 | GSXR 750 SRAD

Past: CB125TDC | TZR125 | GPZ500 | CBR600F3 | ZX9-R | GSXR1000 K4

[Hugh Farking Cant]

Dynojet kits (stages) usually specify the state of tune and use expected of the bike they are to be fitted to.
Stage 1 for example is designed for; fast road use, minimal engine tuning,non restrictive silencer and air filter.

[Snorty]

[Hugh Farking Cant]

Stage 1
Intended for motorcycles with a stock engine using the stock airbox, air filter and stock pipe. Stage 1 kits are fully adjustable to allow the use of a well designed aftermarket pipes and stock replacement air filters like K&N. Stage 1 kits are designed to improve throttle response and driveability and in most cases power increases of approximately 5% throughout the entire power range can be achieved.

Stage 2
Intended for motorcycles with a stock or mildly tuned engine using a well designed aftermarket pipe with a modified airbox and a stock replacement air filter. Stage 2 kits are designed for applications where individual filters cannot be installed and for applications where airbox modification improves the engine's performance. In most cases power increases of approximately 8% can be achieved.

Stage 3
Intended for motorcycles with stock or mildly tuned engines using a well designed aftermarket pipe and individual air filters. In most cases power increases of 10-15% can be achieved. However driveability may be compromised particularly with short stroke, high rpm motors. On some modern engine and airbox designs, individual filters and proper jetting offer no performance improvement yet compromise driveability, in such cases stage 3 kits are not available.

£200 would only be acceptable if testing/adjustments and a Dyno run are included.
It is only a set of jets.

N.B. Valve clearances want to be spot on before spending money on a jet kit.