i installed all minor parts for my 06 15f but when i installed the freeflow exhaust system.. my 15f was just running 54mph! what tha! i need help guys.. tnx

How did you register that speed? GPS or radar gun? What speed were you running before the Free Flow installation?

Are you sure you have the water routing set up as outlined in the installation instructions?

i registered that speed with the speedomiter.. now i have the complete kit of the rpm kit if riva.. except with 14/21 impeller i have a 13/19 impeller and i have a intake grate.. what do u think i should do?

You aren't running what we call for in our RPM Kit. You've changed the prop and added the intake grate, which hurts top speed compared to the stock grate.

You need to use a GPS or radar gun to document your speed properly. Until you get an accurate speed recording I can't offer much help. You need to document your RPM using an aftermarket tach also.

ok sir.. wer could i buy such parts?

We offer aftermarket tachometers in our onilne catalog (navigation at top of forums!). Here's a short cut: click here.

For the GPS you can find those at any electronics or boat supply store. A decent one will run you about $100.00.

i have a question is the freflow exhaust of riva for the 15f illegal or legal on the stock division for kings cup? and the stx molding kit?

I can't say as I'm not familiar with the rules they are using for that race. I would contact the promoter directly (get it from the horses mouth!!).

thats the problem that i have sir i dont know how to speak thai.. im a filipino from the philippines.. we dont understand their letters

Have you tried asking someone directly involved with King's Cup? Or the IJSBA? I'd help, but my Thai isn't any better than yours!