[johnny787]

Was out riding today, 02 400ex, bored to 416 i think it is, with a hot cams s2. I started hearing a loud ticking and a few minutes later seized up completely, wouldn't turn over or anything. Get home, rip it apart and I was very surprised to see what I saw.

The 2 bolts that hold the timing gear to the cam had came out, one was jammed in the gear and the chain. What would have caused this?

 

[Helmut]

Sometimes they will back out if you don't use locktite on the bolts.

 

[johnny787]

Sometimes they will back out if you don't use locktite on the bolts.

but would that cause them to look the way they do?

 

[Helmut]

Yeah, they probably did that when they were coming loose and the sprocket wallowed them out. I would say getting hung between the timing chain and sprocket, like in the first picture didn't help either. They probably didn't come out all at once, the sprocket probably wallowed the threads off them.

 

[unclejpl4x4]

yup no lock tight will cause that. a little Loctite Threadlocker Blue 242 from Loctite Adhesives goes a long way. Use it all the time + red at work

 

[johnny787]

I didn't do this build, I bought it built. I use locktite on EVERYTHING, if its not locktite, its antiseize.

Have you guys taken the cam sprocket flange off the cam? I cant seem to get it off. It looks like I can buy a new sprocket, bolts and flange and call it a day. I ripped it down completely and didn't see any damage and didn't find any. No metal go anywhere besides the top end, small little slivers mostly on the chain runners.

 

[ostrx250]

man that sucks just because someone didnt think it needed a dab of loctite

 

[Redracer]

Good luck brother... that is ugly

 

[TRX2fiveO]

OUCH!! make sure you drain the oil too I suggest leaving the drain plug out and dumping about a half a gallon of hyd oil through the engine. It's thin enough it will wash out the guts.

 

[johnny787]

does anyone know if I can press the cam sprocket flange off the cam? It is labeled hotcams, so I don't know if they machine it as one piece of if they press it on.

 

[grasshopper007]

it can be pressed off, not sure if stock one is the same though