09-19-2009, 03:00 PM #1
`97 XP with Bad Motor -- Rebuild or Part out?
I just bought a `97 XP with a 787 motor. I got a good deal on it, but the motor is trashed. Everything else is great, just the motor is trashed. Should I just part out what is still decent on the motor and sell the hull for peanuts or rebuild the motor??
The motor: 787 that had gotten water in it and shredded the connecting rod bearing. There were metal shavings in the crankcase. I can also see a crack in the bottom of the case (its not over any gasket surface). The cylinders look OK, but I sure they will need bored. Carbs look good too. Manifolds are good.
09-19-2009, 03:19 PM #2
Welcome to the board!
hard to say with out pix...post some up and we'll be able to help ya.
09-19-2009, 07:01 PM #3
If the motor is as bad as you say, "crack in case" just look for another good motor,, might be expensive to rebuild since you are needing cases.
You might find a decent used motor in the off season..
09-20-2009, 04:46 PM #4
i have a 787 in a 96 xp i just picked up when i brought it to program the key it has 116 hours total!! it has 165psi in cyl 1 and 163 in cyl 2, paints chipped a bit on the outside but i am considering parting it out, just bought a new starter for it as it is going bad
09-20-2009, 06:55 PM #5
Just an update --
I finally got the flywheel off and opened up the crankcase. It looks like the connecting rod was dragging on the bottom of the crankcase. Thats were all of the metal shavings came from. I'm pretty sure that this block is history. The crank could be rebuilt, but I'm a little skeptical about doing it myself. I'm just going to look for another block and crankshaft. The rotary valve and intake manifold have some pretty deep gouges too. I think I can mill the intake manifold down and make a new rotary valve. I've got a little machine called a wire EDM that could crank out an awesome rotary valve....
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By YudLuz2 in forum Open DiscussionReplies: 111Last Post: 11-05-2007, 05:36 PM
By Blasterguy in forum Yamaha Old School SkisReplies: 36Last Post: 09-13-2007, 01:15 PM
By Boosteda4tq in forum Yamaha PWC Performance (2-stroke)Replies: 1Last Post: 08-03-2006, 09:47 AM
By rxp_boy in forum 4-Tec PerformanceReplies: 24Last Post: 02-18-2006, 04:06 PM