My CBX 1000Z ´79 engine type?

[piit]

Hi, in every CBX pictures that I have seen the front cam chain tensioner screw/lock nut are located on below of "tap". In my CBX the screw and lock nut are ahead of "tap". Could someone tell me what does that mean? There is a hole on below the tap and filled by some material (soft like a silicone/rubber). I have a picture in hard disk, but could not insert it here. Thanks, Pete

[piit]

Pic added in CBX Photos category.

[CBX NT]

Hi Pete



I believe someone has placed the bolt in the wrong hole. Reasons why? May have stripped the threads in the proper hole. I'm only guessing at that, As unable to fully look at it.



But if correct, not sure on what damage it could do.



I hope you dont mind me adding the pic



Adam

[piit]

Hi Adam,

I believe too that the bolt is in wrong hole, but cannot understand how the tensioner works. Anyway I will change the cam joints, so together I will check the tensioner situation. Thanks for the picture addition!



Cheers,

Pete

[cbxtacy]

the tensioner slides on a shaft that rides in the hole that the bolt is in. Normally there is a seal in the end of the hole that your bolt is in. The bolt with locknut that keeps the shaft from moving is usually screwed in from the bottom of the protrusion. Good luck.

[piit]

ok, so needs to be cautious when adjusting the screw avoid to cam chain over tighten.

Related to above; if the spring is now for some reason out of the game (weak) how I can be sure that what is the correct tightness of the chain when adjusting it?



Cheers,

Petri

[Jeff Bennetts]

The concept is for the shaft connected to the adjuster to protrude and slide inside the gally of the boss on the head. The lock bolt on the bottom is used to put pressure on the shaft after it has been adjusted and hold it in place.



Adjustment on a normal setup is done by loosening the cinch bolt letting the shaft self adjust by its on spring tension, (tip) use a small blunt punch that fits the shaft gally and very lightly tap it to ensure its free. Or remove the valve cover and take a pair of long nose locking pliers and clamp on the adjuster shaft and watch for it to move when you loosen the locking bolt.



Fix it the correct way. Rethread the bottom hole with a timesert or helicoil.



Now for the top hole, it more than likely has been enlarged due to the taping for the locking bolt, I believe you could epoxy that shut and drill it out to the proper diameter for shaft to slide freely and the rubber coated brass plug to seal Okay.