Hi the 3ds has for sure a high compensation system. Works like crap. Blocked it off in mongolia last year. passing 1500meters and the power drops dramaticly.
My 3ds which is the serie1, had:
Different jetting. (Bought German 3aj carb, Ebay.de)
A plastic ring to restrict the vacuum slide for opening fully.(removed)
A restricter ring in the end of the Exhaust. ( Changed exhaust, it was rusted away anyway)
A different snorkel. (Bought German 3aj airbox, Ebay.de)
A different midter section in the airbox. (Bought German 3aj airbox, Ebay.de)
Super high end gearing. ( Changed gearing )
Small oil cooler. (Was Problematic in the hot countries, Kazachstan Etc)
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Christian
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