SWM 240 & 280 Trials
We have kits for the 240cc and 280cc Trials bikes.  Both fit into the existing  manifold and we provide a sleeve for the air box hose so it fits the OKO's intake.  Low and mid-range power is better than with the stock DeLorto, as is throttle response.  Let us know if you have a Jumbo.  We are not certain on jetting but will work with you to get it dialed in. 
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