Major Engine Work
Posted July 31, 2001 - 10:54 AM
Posted July 31, 2001 - 11:20 AM
The culprit was a timing chain that was too loose and jumped a link.
You mech. didn't tell my xr, it was trashed
Sorry about your bad luck
Posted July 31, 2001 - 01:09 PM
Posted July 31, 2001 - 04:46 PM
Unless the crank or rod end bearing self destructed I can't believe a piston floating would hit the valves. I am going to go with the chain jump theory. Tell us all what your oil type and change interval were so we try not to make that mistake. (Just Kidding) Sometimes it happens, the downside of a four stroke I suppose. As far as still being able to ride the XR I think your mechanic may be a bit too opinionated and maybe even more ignorant. I don't see too many Honda mechanics in the unemployement line! This Yamy engine is a state of the art mill and needs a little TLC. Think of it like an Indy car engine, you wouldn't be too successfull beating back and forth to work everyday without causing you some trouble now and then. Performance comes with a price. Not that I generally subscribe to the maintainance schedule in the owners manual (I believe they are designed to sell parts) but I am curious How many hours/miles the motor had on it before it grenaded. Good luck getting your scoot back in the dirt!
'00 WR 400
Western Fab Insert, YZ timed, airbox lid removed, YZ throttle stop, Michelin S12's, UFO YZ plastic,Mobile 1.
Posted August 01, 2001 - 07:27 AM
I got the bike in the spring of 2000. I have had three major incedencted which may have affected the engine. 2 major water flooding incidents, the second time I had the bike out I thought I would drive along the side of a pond to clean it off, fell into a hole and almost lost the bike in quick sand, Then while wheeling across a stream the back tire spun out and I set it right down under the water. Both times I got the bike running within 12 hours, changed the oil untill it started coming out clean. In the fall of 2000 I switched to mobil 1 15W50. The thrid significant event was during a 24 hour ice race, the oil breather vent froze and the valve cover plug blew out. The bike was out on the track for over an hour untill I pitted for gas and noticed the there was oil all over the side. It reqired over a liter to fill it back up.
This bike has been ridden hard and often. I change the oil twice a month and replace the filter, every month.
Odlly engough, just befor the engine calfed I had just changed back to regular 10W40 motorcycle oil after reading about problems with using Mobil 1 in the recent Dirt Bike magazine.
It looks like the repair is going to cost between $800 and $1000 CDN so I will just call it an operating expense.