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Thread: Killed my engine... BAD Reply to Thread
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  Topic Review (Newest First)
03-30-2012 09:13 PM
I'm beginning to think it might be better to go ahead and replace the tensioners with TOC ones even if the engine isn't making any noise.
And this comming from the "all stock preacher" of vn750....

03-30-2012 08:16 PM
VN750Rider/Jerry My best guess is that an ACCT failed, the cam chain jumped a few teeth, piston hit valves at 105 mph, engine basically exploded. I'm beginning to think it might be better to go ahead and replace the tensioners with TOC ones even if the engine isn't making any noise.

IMO, that engine is not rebuildable. The damage is too extensive, there may be hidden damage from all the stress it took, and those metal particles could be all throughout the engine, including in the bearings and transmission. And, the crankcase halves ARE a matched set.
03-30-2012 07:56 PM
phurp Fantastic that your on the road again. Really happy that one of the two bikes still lives. You are a true biker.
03-30-2012 01:55 PM
kanuck69 I missed thgis last years evedently. I must say... when you break something, you do it right! lol

Glad you got it running & back on the road.
03-30-2012 01:16 PM
beeblebrox82 nice work! Epic failure, glad you're on the road again!
03-30-2012 01:05 AM
DaveT319 I purchased a crashed '05 for about the price that a new engine would cost. The front end was mangled, but the engine was undamaged and there is/was enough stuff still usable that I'll make back the purchase price plus some.
03-30-2012 12:29 AM
Ccspinner Way to go, did you get a new motor or rebuild that old one?
03-29-2012 11:40 PM
DaveT319 Just a little bump:

A little over a year after my "mishap", I have a new engine installed and....


Got a few little things to tinker still, but it's running again. Thanks to all those who gave me advice with questions I had during this process. Took much longer than it needed to (I'm a horrible procrastinator), but at least it's now done.
08-12-2011 08:08 AM
RakerBill I would wager the rockers coming off of the valves was from valve float, which caused to valves to come into contact with the piston. That would immediately cause the piston to shatter and cause the bent and busted rod.
Another thing I have ran into on a car engine with a busted piston was too much clearance between the piston and cylinder wall, causing the piston to rattle in the bore, and shatter.
Whatever happened, sorry to see it, especially during riding season. Mine has been down since April.
08-12-2011 08:00 AM
RakerBill Damn, sorry to see that. Almost sounds like what happened to mine, minus the engine seize.
Could over revving the engine do what happened to yours?
I know 7k is below the 8500k red line, but that's up there rev wise.
I haven't pulled mine apart, almost afraid to. Mine turns over, but has a clunk every time the rear cylinder comes up.
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