650-XSories can supply Carrillo rods for any application.
Carrillo Rods are made in the United States and are by reputation the best conrods that money can buy. 650-XSories can supply Carrillo rods for 840cc kits for 447 motors or 750cc kits for 533 motors and these kits are new and were not previously available for these motors and are only available from us!

The rods in all 650s are a typical production rod. They are cast, and the eye in each end is the bearing surface. A far better alternative is a forged rod. We've had many such rods made by Carrillo, the acknowledged leader in that field. Their rods are drop forged of 4340 chrome-moly, have a hardness of 38Rc, a tensile strength of 170,000 psi, are polished all over, shot-peened, X-rayed, magnafluxed, and balanced as pairs. They are also bushed at both ends, meaning that they can be rebuilt any number of times. Yamaha rods are not bushed and so are a throw-away part. Carrillos are more than twice the price of stock rods but are infinitely superior. If your motor needs new rods and you intend keeping the bike for a long time or subjecting it to hard use, you really should consider this option. Also, the Carrillos are made with a length of 140mm which decreases angularity and increases piston dwell. From an engineering perspective, the longer the rod (in relation the stroke), the better.

Do you need to rebuild the crank and replace the rods? That depends on their condition. Remember though, that we're talking about a bike that's at least 20 years old. Unless the crank has already been rebuilt at some stage or the bike has incredibly low mileage for it's age, it may well need to be done. Many owners baulk at the cost of having the crank rebuilt and though it is expensive, once done, it's done. Unless you severely abuse the bike, it should last as many years as it has already. It's a job you'll only do once. Unless you're sure that it's OK, have it inspected before doing anything else.

If it needs new rods, Carrillos are first choice by virtue of their length, that they can be rebuilt, and their incredible strength. Second are 533s but it's extremely unlikely that you'd have such a motor and they can’t be adapted to a 447. The only way to fit 533 rods to a 447 motor is to fit the entire crank, if you can find one. Next are the 447s. If you need new rods, subtract the price of the Yamaha item from a Carrillo to get it's true cost. If you still can't justify the expense, buy the 447s.