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Cam Chain & Top Idler Query

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Moderators: KeithZ1R, chrisu, paul doran, Taffus

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Tonto
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Cam Chain & Top Idler Query

#1 PostAuthor: Tonto » Tue Jan 14, 2020 6:22 pm

Chaps, apologies my spannering skills are a bit limited and any advice would be appreciated.
Was checking valve clearances today on my Z1000A1 project - bike is still on my ramp but starts and runs fine with no noises or rattles etc (meant to be low miles but no guarantees).
A couple of inlet clearances were tight, but more worryingly whilst rotating the crank I noticed that the cam chain was not at a constant tension and appeared to have a slack spot. I dismantled and checked the tensioner which appeared to be functionng Ok. I then whipped off the top idler gear, the gear was hardly worn but felt loose on its shaft (as if its needle rollers were failing).
I was going to replace the cam chain and top idler, or get he bike looked at by someone who knows what they are doing :blush - but before doing either is there something I am missing and should be checking out ?

The bike's been running strongly for a few workshop sessions without any drama, so reasonably I did not think there were major problems: maybe I am being delusional.

Cheers Tim
Last edited by Tonto on Tue Jan 14, 2020 7:35 pm, edited 1 time in total.
"Better to remain silent and be thought an idiot, than to open your mouth and remove any doubt" - Abraham Lincoln
Z900 A4 / Z900RS / Hodna CBXZ / H1F 500 Project / Z1000A1 Project / CBXZ Project

chrisu
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Re: Cam Chain & Top Idler Query

#2 PostAuthor: chrisu » Tue Jan 14, 2020 7:34 pm

you did have the bike at TDC before you removed anything didn't you ?

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zed1015
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Re: Cam Chain & Top Idler Query

#3 PostAuthor: zed1015 » Tue Jan 14, 2020 7:42 pm

It is very unlikely that the needle bearing has failed but the rubber that is sandwiched between the outer sprocket ring and the inner bearing holder degrades over time and becomes detached .
This is what may have happened to yours .
It is a common occurance and best replaced with a solid Liska type.

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Tonto
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Re: Cam Chain & Top Idler Query

#4 PostAuthor: Tonto » Wed Jan 15, 2020 12:00 pm

Thanks, will acquire / fit a new one.
Chrisu - yes crank was at TDC, but since then I think my ineptitude may have caused me a new issue :-(
"Better to remain silent and be thought an idiot, than to open your mouth and remove any doubt" - Abraham Lincoln
Z900 A4 / Z900RS / Hodna CBXZ / H1F 500 Project / Z1000A1 Project / CBXZ Project

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Pigford
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Re: Cam Chain & Top Idler Query

#5 PostAuthor: Pigford » Wed Jan 15, 2020 12:02 pm

Tonto wrote:Thanks, will acquire / fit a new one.
Chrisu - yes crank was at TDC, but since then I think my ineptitude may have caused me a new issue :-(



You ain't bent some valves now, have you?

Been there and done that whilst adjusting auto-tensioner....... not once, but twice in the last 30yrs :roll:
And on the 7th day... Zeds were created!


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