Root cause?
okay, my engine is seized. has been before, we broke it free but it's seized again, so i'm finally just going to tear it apart and rebuild. however, where/how do i go about finding a new piston package? will i need new connecting rods? will i need a new crank? any ideas where to get the cylinder's bored out? i've never done anything remotely like this so any and all advice would be great.
If you decided to tear this engine down yourself, you'd have to have a manual and percision tools to check things like the crankshaft deflection and rotary shaft backlash.
If you just do an upper end and find that one of your main bearings at the crank was the cause, then your going to have the same problem. Waste your money.
You can do as jhjesse recommends and take a look at SBT engines. In the last few years, I have bought and installed 12. I just finihsed my 13th last month. I have never had one return on an engine. I did have one RAVE that bent. They sent me a new one for free. There is no better or cheaper way to get back on the water with a newly rebuilt engine from SBT. You get a one or two year "no fault" warranty. The cost of your engine is will below a $1000 bucks. They guarantee that your engine rebuild will be standard or the first bore oversize. They do a 4 point test to ensure it meets or exceeds OEM specs.
If you decide to do this yourself, you will need to buy a crankshaft because you have no idea of the condition of your rotary seals. If they are at a stage where they are beginning to leak, once again, you've wasted money because you can't just replace those seals.
Google SBT and go to their home page. Read up on what they promise to do for your business. All you got to have is a rebuildable core. Oh yeah, and do exactly what they say to do at breakin procedure. There are people out there who will say that SBT is a lousy place to get an engine. With a lot of questions I've asked of them, it seems their engine might have blew because they did not have the patience to do a proper break in and did not vary the throttle. Then, the engine seized................so, check them out, read up on their reputation. They have been in business for over 10 years. You don't stay in business from selling junk.
Here's a copy and paste of their "Mission Statement" .........read on.
In 1998, Greg Pickren launched Florida-based Short Block Technologies (SBT) after seeing a need to provide remanufactured, PWC two-stroke engines to individual ski owners—and ski dealers—who were looking for a cost-effective alternative to rebuilding an old engine or buying a new one. Today, the company is touted as the largest remanufacturer of PWC engines in the industry, selling more than 10,000 engines in a year from its huge 30,000 square foot factory. Remanufactured PWC engines for Sea Doo, Yamaha, Polaris, Kawasaki and Tigershark are included in SBT's product line and makes it easy for the guy who hasn't worked on a PWC engine before. "You've got a six-year old PWC, and you're about to sink more money into it than it's worth," Pickren says. A rebuilt engine keeps the PWC on the water.
Each remanufactured watercraft engine undergoes the same rigorous process. Only the block of the used watercraft engine is reused. The used pistons, rings, rods, bearings, gaskets, and oil seals are discarded and only new parts are used exclusively in the reassembly of the engine. SBT uses many of its own branded parts in its rebuilds, and in 2002, expanded into selling hard parts as well—offering its own line of pistons, starters, gasket sets and carb rebuild kits, in addition to pump parts, shafts, and seal kits.
In January of 2006, after extensive R&D at its own research facility—Alligator Point—SBT added remanufactured four-strokes to its product line, and was the first to offer a Premium Engine Package that includes a 24-month fault-free warranty. Every remanufactured engine automatically comes with a 12-month warranty. Pickren adds, "By upgrading to the Premium Engine Package, it allows our purchasers the added security of knowing that their engine is covered for a full 24-months and will be replaced with no questions asked, regardless of the type of failure." Every SBT remanufactured engine under warranty can be overheated, run out of oil, or detonated and it will still be covered.
