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THE MAN
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3,750 Posts
no matter what full system you put on a 98-01 R1 you are going to loose low end power and smoothness, and often that ability to use large throttle openings at low rpm in a higher gear.

Thats the nature of these bikes.

I have done to many of these bikes to remember, as well as still owning and riding my own 00 R1 with the Ivans/Akra/air box MOJO equipped bike.
 

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THE MAN
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3,750 Posts
no, they wont. Not any noticable difference.

Your 100% best bet is to do the air box mod, use an aftermarket filter, and the stock 130 mains. It makes a huge difference. It's not as good as stock down low, but it's the closest you will get with a full system on these bikes.
 

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THE MAN
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3,750 Posts
no matter what gearing your bike has, it will still make the same power curve....

No need for expert tuning :) Ivans kit, full akro, air box mod and a K&N. It's been done a million times with the same amazing results. Thats why it's called the "MOJO" :)
 

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THE MAN
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3,750 Posts
With a full system on these bikes it's pig rich under 4k rpm. You can lower the needles to improve drivability in that range, but you will do so at the expense of top end power (the whole reason for putting a full system on these bikes).

The newer bikes also have an exup system.

Fi has many advantages, not relying on vacume to draw in fuel is one of the main ones.

These motors are great street motors, they have terriffic mid range power, and deliver great part throttle power.

They do have disadvantages as well though, in that the head is not a fast burner, and combustion space is not ideally shaped, it is exhaust sensetive, and cam timing changes don't seem to make as drastic a change as in other (read G1K) motors.

If Ivan could have made these motors run seemlessly at low rpm with a full system he would have done so. The guy is a genusis. A truely GREAT motorcycle tuner.

If you take away timing down low it will further reduce performance.
 
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