Επειδή πολλά ειπώνονται πάνω στο συγκεκριμένο θέμα με το βύθισμα στις 5500 - 6000 RPM
παρουσιάζω το ακόλουθο υλικό το οποιο πιστεύω να σας λύσει κάθε απορία.
Ζητω συγγνώμη που είναι στα αγγλικά αλλα δοκίμασα να το μεταφράσω και δεν έβγαινε νόημα και βαριέμαι να το κάνω με τον παλιομοδίτικο τρόπο.
RS125 περιορισμοί
The first restriction is a power restriction, it will limit the RS125's maximum power to 15bhp (or 11kW). The restriction consists of the lack of a Powervalve (instead a blanking plate is fitted so there's a fixed exhaust port height), Powervalve electric motor (opens the powervalve), Powervalve control unit, some sort of exhaust restriction (the pipe diameter is restricted with some sort of insert into the exhaust) and the matching carburation changes to reflect the restriction. This restriction is only found on some RS's (the 15bhp or 11Kw versions) to make it legal for 16 year olds to ride it in some countries. If your bike can only do about 120-130KM/H and there isn't a sudden power increase at about 8-9,000rpm then it's probably restricted. Another way to check for the lack of a Powervalve is to put the bike into neutral and keep it idling, then rev it slowly to about 3,500rpm. At about 2,500rpm you should hear a clicking sound from the engine. This sound is the powervalve closing and opening. If you don't hear any of this, then your bike hasn't got a powervalve.
The second restriction causes the power dip between 5,000-6,000rpm and it does this by retarding the ignition (spark) in this rev range. This is done so that the RS125 (being a 2-stroke) can be homologated and pass the new European Union emissions and sound tests. This can be removed by modifying the CDI. I've done this myself and it makes the bike much easier to ride around town as you don't have to slip the clutch or go down a gear to get into the powerband. The old RS125 ('98 and before - Rotax 123 engine) didn't have this restriction. Read below on how to de-restrict the RS125 CDI.
How to de-restrict the RS125 CDI to remove the environment dip
This modification ONLY works on the CDI's with the following CDI serial number format :
071000-XXXX-XXXXX
With a sharp knife, dig out a rectangular hole in the BACK of the CDI (where the silicone is) about 30mm by 10mm in size and about 5-10mm deep. It may take some time to dig the hole out completely because the silicone that's used in the CDI is very strong. Once you've dug out the hole, you'll notice a bit of circuit board, this is commonly known as "the bridge". Using a screwdriver or a pair of pliers, break the bridge. After you've done this, fill the hole you've dug with Silicone, make sure you do it properly so that it's waterproof and no water gets in!. After you've done this, there should be no more environment dip between 5-6,000rpm!!
For an easier to follow guide on how to de-restrict the CDI, take a look at the following image that I scanned in of a sheet of paper that was forwarded to me by the organizers of the Aprilia Challenge. Δείτε την εικόνα
ξέχασα να αναφέρω πως αν το κάνετε αυτό με το CDI χάνεται την εγγύηση και αν δεν γίνει σωστά η μηχανή δεν θα ανάβει γι'αφτο καλύτερα απευθυνθείτε σε κάποιο συνεργείο