Need technical help with my Honda CBR600, please be patient and read..?

[bruvvamoff]

It is a 2nd hand CBR600FW. When I bought the bike and had an alarm fitted, the mechanic told me that half the airbox was missing and the intake trumpets had been drilled.
I didnt think much of it as the bike ran ok, but now that I have got used to it, it seems the bike is alot slower than it should be, maxing on the rolling road at about 125mph?
We tried fitting an airbox but the bike wouldn't get above 25mph and went all sluggish and stalled.
Now.. this bike had a DAI system where the airflow into the engine is controlled at certain speeds by a 'solenoid valve'. Firstly, I cannot find this valve and the Haynes book isnt very clear.
My theory is this.. the electrically controlled 'solenoid valve' had malfunctioned on the previous owner so rather than replace the valve (£150!!) they simply removed part of the airbox and the faulty valve and drilled holes to ensure airflow to the engine reguardless of the speed. If this valve is indeed missing, would this explain the poor running engine? If I replace this valve and fit a new airbox would it solve the problem? I want to save myself £60 an hour engineering costs. Also, where would this valve be found on the bike? I would appreciate even one sensible response.

 

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If they butchered the bike themselves to save a few quid i would take the bike back to the place where i bought it from and demand a refund.. Your talking about a high performance sports bike, you can't second guess on somebody elses balls up. Was the bike restricted before you bought it? are you out of your r -plates ? Honestly mate if i didn't know what i was doing or the bike didn't feel safe i would bring it back. Your bike should pull 150 easy, they can hit 165 no problem. I don't think garages are allowed to sell goods knowing theres a fault. I would physically need to see the bike to even make any kind of judgment. I'm not bike mechanic but i would check to see if the bike was restricted, which it sounds like it was and the previous owner wrecked it by trying to de-restrict it.

Edit: just thought of something, i used to be a biker myself before i was physically retired of the road. 99 percent of bikers will help you if your in trouble, bring the bike to a known ride out route and park at the side of the road and pretend your broken down. I guarantee any biker that knows about bikes will stop and try and help or might even tell you there and then what could be wrong. I used to sit at the side of the road just having a smoke and nearly every biker stopped to see if i needed a hand.