305 CSR getting back on the road: timing chain tensioner - Kawasaki Motorcycle Forums
 
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post #1 of 9 (permalink) Old 05-11-2019, 06:39 PM Thread Starter
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305 CSR getting back on the road: timing chain tensioner

Hello all,


I have a 1982 305 CSR which I stopped riding about 5 years ago. I remember I stopped riding it because of a timing chain noise issue, which I determined at the time was a timing chain tensioner. I can remember that these bikes had an issue and there was a modification to fix this issue, but this is all I can remember.


Can someone point me in a direction on how involved this project would be and what I should expect to need to do to get a bike that hasn't been on the road in 5 years. I'm more of an antique car guy, so I have mechanical experience but I have little knowledge of motorcycles.




Thank you,
Brandon
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post #2 of 9 (permalink) Old 05-12-2019, 12:30 PM
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Assuming you don't have the Kawasaki service manual, there's a pdf available on the internet for the KZ305.
The FSM will have specific info for removing, servicing & re-installing the tensioner.
Also, the diagrams at Kawasaki dot com or Partzilla can be handy, as well as EB photos.

I don't know the specifics of your tensioner, but several things to note: read the manual before removing the tensioner or messing with it; don't turn the crankshaft when the tensioner is removed; and do not remove the tensioner mounting bolts only half way.

Mine is different from yours, but I use brake caliper grease to lubricate the tensioner
...

1981 KZ650-CSR. Competition, Sports & Road.
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post #3 of 9 (permalink) Old 05-12-2019, 08:40 PM Thread Starter
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Thanks for the reply. I found some forum posts or articles on changing the auto-tensioner to a manual tensioner several years ago when I first had the issue, but I am no longer able to find these articles. I know one of the big Kawasaki forums has become defunct, so maybe they were on that forum.

Is the auto-tensioner issue a problem throughout the models and engines? I see manual tensioner "kits" available, so it seems this must be a common issue for at least some of the models, but I'm not finding info on how to make the modification.


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post #4 of 9 (permalink) Old 05-14-2019, 01:02 AM
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Looking nice
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post #5 of 9 (permalink) Old 05-15-2019, 10:43 AM
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By vetteman61: Is the auto-tensioner issue a problem throughout the models and engines? I see manual tensioner "kits" available, so it seems this must be a common issue for at least some of the models, but I'm not finding info on how to make the modification.

I don't know about the KZ305. Supposedly on some KZ1000s & I'm not certain of the specifics, but under certain throttle conditions, the tensioner pushrod can move forward, over-tightening the cam chain & causing damage. I installed a Krieger/Clem's-Garage manual tensioner on my 1981 KZ650-CSR, but after doing some reading afterwards at the time, I don't think it's necessary. my bike has the cross-wedge type & I don't know what KZ1000 tensioners are supposedly problematic.

Some auto tensioners can be converted to a manual type & the specifics are dependent upon the tensioner. All tensioners have a push rod that pushes against a cam chain guide. My bike & the KZ305 have a Hy-Vo cam chain with rubber slipper cam guides >> the tensioner pushes against the Rr slipper guide. To convert a tensioner, one way is to drill & tap the tensioner body so that an adjusting bolt can be installed thru the body. The new/long adjusting bolt would have a lock nut. You would then adjust the tension by turning in the new adjusting bolt the appropriate amount >> usually lightly until it stops, then back it out x number of turns or x number of flats on the bolt head. or something like that.
....

1981 KZ650-CSR. Competition, Sports & Road.
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post #6 of 9 (permalink) Old 05-18-2019, 11:47 PM Thread Starter
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OK, thank you for the reply. I've been looking all over trying to find a write up with pictures on this but can't find one anywhere.
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post #7 of 9 (permalink) Old 05-19-2019, 01:16 PM
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Do you mean a how-to for converting the tensioner? Compare yours to the diagrams at Partzilla & EB pics. It looks to me that it would be fairly simple to convert as it's already drilled & threaded thru the end where the adjusting bolt would go.

But I don't know if it's necessary or worth the trouble on a 305. The 1000 has a much more powerful engine & I think most tensioner failure would have occurred at the race track, but don't quote me on that. hee. I thought Ape Racing had a description of the problem, but I couldn't find it.

ps: I may be wrong about your bike having a Hy-Vo cam chain as the drawing shows a roller chain, but it does have the rubber slipper guides.
....

1981 KZ650-CSR. Competition, Sports & Road.
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post #8 of 9 (permalink) Old 06-05-2019, 07:13 PM Thread Starter
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Hey guys,

I've been looking into this more over the last several days and I am having trouble finding any information on the tensioner for the KZ305. I'm surprised at how little info there is out there on this engine. I did find the diagram below and it shows that the end of the tensioner does have a bolt through the end.

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post #9 of 9 (permalink) Old 06-09-2019, 04:22 PM
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I have made manual ones for my GPz 750 and my 454. I just finished the one for my 454 last week.

The factory automatic tensioners seem to weaken over time. Both mine started getting that loose timing chain rattle and I removed both and cleaned and lubed them but that only helped for a little while so I made manual ones. Sure I could have went to ebay and bought one for $40+ but when I have the tools needed to make my own I did not see that as an option that make much sense in my case.

I never had an issue with removing the old and installing the new ones. I just bolted it up and ran the center bolt in just beyond finger tight. I then started the bike and tightened the center bolt until the rattling stopped and then locked it down. If you run it in too tight you will get a whine and if it is too loose you hear that chain rattle so you basically adjust by ear.

Also martin said do not turn the engine over even one tiny bit without the tensioner in place.

1986 LTD 454
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