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Hi guy's, i need a help with compression ratio, i know that freestyle engines are in 14:1 ratio. I go to use a epic cdi for a good curve and retard, but still with my non pv cylinder. To have 14:1 in my 771 cylinder i make this calculation: 0.785x85x85x68 = 385,6cc + 30cc (dome) + 3cc (squish)...

Hi guy's, here is my sn this weekend i go to test and setup in water. Thanks for Jetmaniac and #Zero for good parts and counseling!! and for all of you coz your post are very helpful ! First i setup the engine for surf and i running factory B pipe, 30cc domes and R&D intake with 44's...

Hi Guy's, i buy a used pfp with resonator, any recommendations for the install? I look the water routing in pfp site, but i dont see were to take water for the resonator. This pipe hit beter coold or hot? pics of my pipe and the water routing: Thanks in advanced.

Long rods like cr500 (144mm) in a stock stroke crank with a big bore kit likes group k 845, and a big spacer. Its a good set up?

Hi guys, I am very excited to build my first flat water light hull, I will build it in fiberglass and epoxy resin.(if all goes well, in the future I will go for the carbon project)I was reading everything I could find, but i appreciate the advice of those who have the experience to tell me how...

Hi guys, Anyone have installed the blowsion big bore sleeves? I'm looking for a big bore sleeves for flatwater setup and i think these are cheaps. http://www.blowsion.com/products/839-yamaha-850-big-bore-sleeves-blowsion.aspx...

Hello, my name is Rodry I reside in Argentine, Bs.AS, i work as a technician in a broadcast catv company and have with a friend a motorcycle, atv and pwc workshop. Been riding bmx and motorcycles for years and ready for something different. So I just got my first jet, a sj 650 1993 that I'm...