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rookie mistake????


Dingo55

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Hi 

Appreciate any help/advice

Been waiting for my new valve /head clean to come back from machine shop

( burnt valve r/h cylinder 99r1100rt)

A week back I rolled the bike forward about 3ft in neutral, back on centre stand

Piston still at TDC, cam chain seemed to be as it was unbolted

Locking pin still in place

Just checked and I now cannot see any timing marks through the port hole

What have I done???

Help 

Cheers 

Mark 

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I'm no expert and i didn't sleep at a Motel 6 last night.  My guess is that the drive train and clutch had enough bind to nudge the flywheel jut a bit.  I would take a large flat screwdriver and see it I could move the flywheel a little through the starter hole.  I'm not recommending this for you But I can get gorilla at time and I would.  It's slower and more careful than putting it in high gear and turning the rear wheel by hand.

If that is too much you can pull the transmission off and get a good look at the flywheel marks etc.

I'm sure someone smarter on this post will have a better idea. 

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5 hours ago, Dingo55 said:

Hi 

Appreciate any help/advice

Been waiting for my new valve /head clean to come back from machine shop

( burnt valve r/h cylinder 99r1100rt)

A week back I rolled the bike forward about 3ft in neutral, back on centre stand

Piston still at TDC, cam chain seemed to be as it was unbolted

Locking pin still in place

Just checked and I now cannot see any timing marks through the port hole

What have I done???

Help 

Cheers 

Mark 

Morning Mark

 

Are the pistons STILL at TDC??? This is the important part.

 

Was it (verified) at the TDC (mark) through the timing hole when you pinned it?  

 

If it was properly pinned then it didn't move.  

 

If pistons are still at TDC & it is properly pinned then look in the timing hole again with a better light.

 

 

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Thanks for all replies

Checked again this morning down on hands and knees

I can see the marks on the very top side of the window if I look up at a very steep angle

Certainly not near the centre of the window as normal

Does this mean that the pin wasn't locked in properly? 

Is it ok to turn that amount back?

Appreciate the help 

Cheers

Mark

 

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12 hours ago, Dingo55 said:

Thanks for all replies

Checked again this morning down on hands and knees

I can see the marks on the very top side of the window if I look up at a very steep angle

Certainly not near the centre of the window as normal

Does this mean that the pin wasn't locked in properly? 

Is it ok to turn that amount back?

Appreciate the help 

Cheers

 

Morning Mark

 

Sounds like engine isn't/wasn't locked with a proper sized locking pin.

 

Yes, you can carefully turn it back just be careful of the loose chains. 

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Thanks DR

Yeah locking pin is not the bmw item so possibly part of the problem 

although I have used it previously without incident

Do we know the diameter of the bmw pin?

Thanks again 

Cheers

Mark

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Hi

Would anyone care to comment on the pic below

The markings at the 7 position suggest to me that this item has been used previously

although sold as a $300 new part 

Thanks for the opinions/help

Cheers

Mark

DSC03590 (2).JPG

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9 hours ago, Dingo55 said:

Thanks DR

Yeah locking pin is not the bmw item so possibly part of the problem 

although I have used it previously without incident

Do we know the diameter of the bmw pin?

Thanks again 

Cheers

Mark

Morning Mark

 

The CORRECT locking tool isn't just a straight rod, it is multi-dimensional (stepped).

 

It really isn't worth making the complex BMW tool for a one-time usage. 

 

Most just use an 8mm or 5/16" rod, or an allen wrench, to lock the engine from turning more than a couple of degrees, then manually roll the engine within the locking tool's play to align the TDC mark for final assembly. 

 

If you have a lathe, have the round stock, have precise measuring tools, & have the time I can send you a drawing on the proper tool but as mentioned above that is a LOT of machine work for a one time use tool. 

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Morning Dr

Thanks again

I've previously used my homemade pin with no problem

Moving the bike whilst in pieces was a first so I'll be careful not to do that again

Thanks for the offer

Almost ready to begin reassembly

The rocker arm adjustment looks a bit daunting at the minute 

Cheers

Mark

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