Adding a jet kit in conjunction with the open airbox lid ( either from a Ducati performance kit or simply a standard lid cut open ) gives a very noticeable gain, particularly in the 5,000 to 8,000 RPM range. The power curve is changed to an almost straight line, and the response is very good. There is a lot of induction noise, however, which some people absolutely love and some hate. Each to their own.

The graph below shows a 900SL before and after. The bike was fitted with Staintune high rise stainless mufflers, but otherwise std. As usual, the green line is before, the red line the finished product.

(dyno graph courtesy of DYNOBIKE, (03) 9553 0018)

This is a very simple mod to make. Probably the best mod to make to a carbed Ducati, apart from a 14 tooth front sprocket. It is a mod that needs to be done as a combination, however. If you’ve ever tried running a std carb Ducati with the airbox lid off you will know just how badly they run. The jets used differ from those fitted when tuning a jet kit with the airbox lid on, so it’s not a case of doing one first and the other later.

Total pricing for this job is around $450, being $195 for the jet kit, $105 for new needle jets and $150 labour ( including cutting up your standard airbox lid ). If you wish to add the Ducati Performance K&N filter / open airbox lid kit, you will need an extra $172 ( or you could put it towards having the cams dialed, as the K&N is certainly not essential ).

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