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Author Topic: 690 valve check  (Read 245 times)

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Offline geopat

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690 valve check
« on: October 29, 2020, 06:44:34 am »
So guys I'm servicing before a trip and I'm checking the valves, now I have a manual timing chain tensioner fitted so do I set the valves with the chain slack ( as it would be using the stock oil pressure based tensioner ) or do I set them with it tensioned up as it would be used, there is definitely a difference in the gap pre and post tension, any advice would be appreciated
 

Online Dux

Re: 690 valve check
« Reply #1 on: October 29, 2020, 08:33:12 am »
You ride with it tensioned so that would be the way
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Offline geopat

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Re: 690 valve check
« Reply #2 on: October 29, 2020, 10:55:58 am »
Thought so thanks Donald
 

Offline BuRP

Re: 690 valve check
« Reply #3 on: October 29, 2020, 01:26:40 pm »
do I set the valves with the chain slack ( as it would be using the stock oil pressure based tensioner )

I think most (any?) hydraulic tensioner does not go slack due to a non-return mechanism, it can only go one way i.e more tension.
That said this bike's notorious for chain rattling after startup, so my hunch is that the non-return mechanism is to blame here..... but, you have replaced this with a mechanical one, so keep it at its setting and all will be good  :thumleft:
Sparta MC50, 46 other 50cc's, Garelli Tiger Cross, Jawa 250, Kreidler RS (plated), Kawasaki S1 250/3, S2 350/3, H1 500/3, H2 750/3, Suzuki GT380/3 - 10 year gap - KDX200, BMW 1150GS Adventure, Honda CBR600RR, Honda XR650R 2007 & 2003, Honda CRF230, Yamaha BWS100, BMW F800GS Adventure, Husqvarna 701 Enduro 2018, KTM 790 Adv R 2019, KTM 2020 XC-W TPI 300 Six Days, KTM 2014 500 EXC-W Six Days, KTM 790 Adv R Rally 2020, KTM 890 Adv R Rally 2021
 

Offline Mr D

Re: 690 valve check
« Reply #4 on: October 29, 2020, 01:35:04 pm »
manual timing chain tensioner

Where does one source one of these and is it worthwhile?
All men dream, but not equally. Those who dream by night in the dusty recesses of their minds, wake in the day to find that it was vanity: but the dreamers of the day are dangerous men, for they may act on their dreams with open eyes, to make them possible. T. E. Lawrence
 

Offline geopat

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Re: 690 valve check
« Reply #5 on: October 29, 2020, 02:10:12 pm »
manual timing chain tensioner

Where does one source one of these and is it worthwhile?

I got mine from rally raid UK but I think flying brick also brings them in ,as to worth its hard to say i replaced stock before there was an issue and havent had any trouble but there is alot of info on the net about earlier model bikes having issues