that sick feeling, a tale of open belt covers... FIXED!

[Magnus]

Yeah, the exhaust cam is the bottom one.  If the timing marks on the two cams are the same number of teeth away from the timing marks on the head (in the same rotational direction) then that's good.

Now look at the timing mark on the drive pulley and see how many teeth it is away from the timing mark on the motor.

I'm having a hard time locating the timing mark on the motor for the drive pulley.  Any hints?

[Magnus]

I think it's time to schedule a Dr's appointment for BlackFog and bring him in for an examination and hopefully just minor surgery.

Look at the pulleys as well and see if there is any evidence of rock damage (pits or dents).  Something caused the belt to jump and also at the same time cut the belt itself.  Usually the evidence can be identified once you look closely.

Exposed belts are definitely cool but sometimes there is this kind of damage that results thereof. I've experienced the same but still run open belts to this day.

Hopefully it's nothing more major than a few bent valves and that the piston / valve guides are ok.

no doubt....  although i'd like to have a clue what the damage is before i bring it somewhere.  looking at the pulleys, i haven't located the evidence of any damage yet...  i'll give it a more thorough look later.  thanks.

[Rameses]

I'm having a hard time locating the timing mark on the motor for the drive pulley.  Any hints?

Can you snap a pic of the drive pulley for us?

[woppini]

Not sure why your being told to push the bike to see if it locks up?  Pop the valve covers off, take the belt off, turn the cam shaft so the "rockers" are on the bottom lobe (flat side) of the cam. This will be where the valves should be closed  if the piston were at top dead center. It doesnt matter where the piston is in its travel at this point. Get an air compressor and and feed air into the cylinder from the spark plug hole. If you feel air comming out of the exhaust pipe or intake (air filter housinging) then you probably have a bent valve. Another way to check if you dont have a compressor is to look at the valve actuators. If there is alot of play between them and the valve, it means the valve isnt seating because its bent.

[Magnus]

[Rameses]

Unfortunately, that notch on the side of the black side cover is the timing mark, which is 9 teeth off from the timing mark on the pulley.

Sorry man.   

[Magnus]

yup, i see it...  hard to get happy after that one.

thanks for the help, though...

[Rameses]

yup, i see it...  hard to get happy after that one.

thanks for the help, though...

No problem.

I was really hoping that one was going to line up too though.   

[Howie]

Once there is an audible clunk and no more movement timing marks become irrelevant.  Mangus, you could probably save some money and maybe hassle by removing the head yourself.  If there is no piston damage take the head to Country Joe at Trebour or Steve at ECS for repair, then replace.

[uclabiker06]

That sucks man.  Good luck.

[Magnus]

this will be in the capable hands of ECS shortly... 

[ducpainter]

this will be in the capable hands of ECS shortly... 

Glad you hooked up Mike.

[Norm]

I'd gues about a 90% chance to smacked a valve & have no compression in that cylinder. Verify it as mentioned above & then pull the head & have someone lap in some new valves. Smooth out any sharp edges in the piston & you'll be fine.

[EvilSteve]

Saw BlackFog in person yesterday getting some love. Hope it's all sorted out soon.

[Magnus]

Saw BlackFog in person yesterday getting some love. Hope it's all sorted out soon.

yup!  got my fingers crossed on the diagnosis!