Engine full of fuel and seized up

[PJM47]

What's this circled in red? (It could be something or nothing, difficult to tell on my phone)

Just a bit oil, cleaned off and there's nothing there.

[PJM47]

All gears and teeth are fine.

The conrods don't look obviously bent but I guess it would be difficult to tell.
It is tighter when pistons 2&3 are down (compressed) and fairly loose when they are the way out.

So can I get to the pistons / conrods without opening the top end or is it now major strip down?


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[PJM47]

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[Johnwebley]

Have you got the head off?

Or the cam off?


If not. That may be the reason it is  difficult to rotate.

The cam opening the valves

Sent from my SM-A750FN using Tapatalk

[K2-K6]

If you want to lift the crank out you can remove cam and rockers to let the cam chain drop down to crank,  then undo conrods/ big ends and lift crank out

You dont have to disturb the barrels and head at this stage.

[PJM47]

Cam and head still on. Haven’t touched the top end at all. I’m a bit reluctant to take things apart unless it’s really necessary, so was trying to establish what is normal and what is sensible to check for at this point.  The more I take apart the more I can check but also the more chance of things going wrong/me failing to put it back together properly
Is there any fairly non intrusive checks I can do? Would it be silly to put it back in the bike now?

[Nurse Julie]

No point in putting engine back in the frame yet, you haven't really diagnosed the problem yet. It would be such a shame and a pain to have to take it out again.

[PJM47]

Yes absolutely, but do we know there actually is a problem now?

[philward]

Been following this thread and all the experts views - I would go for a full strip (I know its not what you want to here) - I think hydraulic lock damage - piston/rod - needs to be eliminated

[Bryanj]

Sorry its got to come apart, there should be no difference 1&4 moving and 2&3 moving

[SteveW]

I don't know if this is even possible but could the cam have sheared in two?

So if only a part of the cam is turning you could get more than one compression stroke at a time and therefore way more difficult to turn engine?

As I said I don't know if this is even possible but a mate of mine did have a cam shear in two in his car once.

[Bryanj]

Yes its possible and yes it has happened on other bikes before

[K2-K6]

Inspection of cam is easy,  just remove cover as it is just that "a cover" and disturbs nothing.

[PJM47]

Ok will have a look at that next.

[PJM47]

All looks ok under the rocker cover.

Cam out and head off next then. I'll read the manual, but any top tips I should be aware of?

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