A rebuild is looming; EDIT: Maybe not....bad carb synch?

If it's broken or just needs tweaked

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Volker_P
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Re: A rebuild is looming; EDIT: Maybe not....bad carb synch?

Postby Volker_P » Fri Aug 16, 2013 1:38 am

There are several options for cam chain tensioner problems
(although I do not hear something like that in the video)

1. Cam chain tensioner mounted misaligned:
To be checked via the oil pan, see pictures in Ibsen's Replacing the cam chain tensioner thread.

2. Tensioner stuck:
One can try to open the second, upper bolt, too. This may help to get a stuck tensioner free. But open just a turn, no idea if one could put it back if you remove it completely (although I know of someone who managed it at a 500. However he kept the adjustment nut fixed because he had to take bolt out only to retorque the head bolt beneath).

3. Cam chain worn

Below a picture of the cutout for the screwdriver check. :wink:
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scott s
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Re: A rebuild is looming; EDIT: Maybe not....bad carb synch?

Postby scott s » Sun Nov 17, 2013 10:37 am

Well, after looking closely at the pics and wishing very badly that it wasn't so, I believe that CB650 is right: I think the cam chain adjuster is installed incorrectly.

This pic is from another thread and shows the adjuster installed WRONG.

Image

This is a pic of my engine that I took while it was on the engine stand. I didn't know about the tensioner deal at the time and didn't know to check. The picture is dark, but if you look carefully you can see what looks like the end of the tensioner. About 9 o'clock, just above the gear and below the bolt at 10 o'clock.

Image

How much tear down is involved to get the tensioner where it belongs?

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Volker_P
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Re: A rebuild is looming; EDIT: Maybe not....bad carb synch?

Postby Volker_P » Tue Nov 19, 2013 3:32 am

Yes, this is the bottom end of the tensioner. Nothing you should see.
Guess you have to remove the head, possibly even lift the cylinders a bit to place it in there correctly.
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cb650
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Re: A rebuild is looming; EDIT: Maybe not....bad carb synch?

Postby cb650 » Tue Nov 19, 2013 9:37 am

Lifted from the sohc4 post.


Pulling the sump is the only sure way. Maybe a scope through the clutch cover?
To get it in the slot with the head on you almost have to bend it. not drastic but just a little re curve to make the bolt clear.
Did you clean the tank out?!?!?!?!


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