Guys,
Have any of you went into your carbs and replaced your main jets with the same jet size? And does anyone know why Yamaha in their infinite wisdom uses 122.5 jets in #1 & 2, a 117.5 in #3 and a 120.0 in #4?
The reason I ask is a friend of mine took his 06 with a Dyna 3000, Barons Nasty Boy slip- ons, needles shimmed and K&Ns and put it on dyno at a Yamaha shop. They started at 72.3HP and 74.05 lbs torque and ended up with 74.95Hp and 73.84 lbs. And they did this by installing 115.0 main jets in all carbs.
My first thought is that they don't know what the heck they are doing, but how did they end up with an increase in HP.
I have only messed (considerably) with 86-93 carbs and know that they came with 125.0 mains. And (in 89) with a DynoJet V-Boost kit (which they stopped offering in 92) with 150 mains and a few other pilot jet changes, I could get close to 100HP on a dyno. With these RSV carbs, I'm back on virgin ground.
Curious minds need to know,
Rick