Da "Thumper Talk" :
http://www.thumpertalk.com/blog/7/entry-127-the-four-stroke-dirt-bike-engine-building-handbook/?utm_source=emailcampaign218&utm_medium=phplist&utm_content=htmlemail&utm_campaign=spring%20bike%20prep,%20eliminate%20arm%20pump%20pt.%203,%20riding%20peru,%20graphics%20for%20life%20contest, (http://www.thumpertalk.com/blog/7/entry-127-the-four-stroke-dirt-bike-engine-building-handbook/?utm_source=emailcampaign218&utm_medium=phplist&utm_content=htmlemail&utm_campaign=spring%20bike%20prep,%20eliminate%20arm%20pump%20pt.%203,%20riding%20peru,%20graphics%20for%20life%20contest,)
Sembrerebbe interessante...mi sa che I 21 dollaroni glieli dò!
NO: 17 $ .
Nel testo c'è scritto che inserendo il codice ci sono 4 $ di sconto, per i lettori di Tumpertalk...
Be sure to enter the code: thumpertalk2015 before purchasing and bring your total down to $17.