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Author Topic: Check spring tension (advancer) HOW?  (Read 818 times)

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Offline Deltarider

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Check spring tension (advancer) HOW?
« on: October 06, 2020, 04:34:40 AM »
On p.92 of the Shop Manual CB500-550 Honda suggests to check the tension of the advancer springs. It says: standard spring tension is 680~850 gr. (1.43~1.87 lbs.) Always wanted to know how that check is done. Any of you have an idea?
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Offline robvangulik

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Re: Check spring tension (advancer) HOW?
« Reply #1 on: October 06, 2020, 06:23:36 AM »
Unster
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Offline Deltarider

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Re: Check spring tension (advancer) HOW?
« Reply #2 on: October 06, 2020, 06:33:30 AM »
Yeah, I thought of that. Never done that though. What's the idea? Spring is not supposed to begin extending below 680 grams?
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Offline robvangulik

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Re: Check spring tension (advancer) HOW?
« Reply #3 on: October 06, 2020, 07:40:49 AM »
Suppose so, never tried it myself, never needed to. For my CBR I'm supposed to set the headstock bearings in that way, never did that either, by feel is much better ;D
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Offline newday777

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Re: Check spring tension (advancer) HOW?
« Reply #4 on: October 06, 2020, 07:45:17 AM »
With a spring tension tester
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
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Offline Bodi

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Re: Check spring tension (advancer) HOW?
« Reply #5 on: October 06, 2020, 07:49:31 AM »
You can check the advance with a strobe timing light, but I don't know what the spec is for full advance RPM. It isn't super critical though.
The suggested test would be done with a spring scale but the spec seems incomplete... normal spec is force per distance not just a force. This seems to want the spring to start extending at 680-850 grams.
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Offline rosewood

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Re: Check spring tension (advancer) HOW?
« Reply #6 on: October 06, 2020, 01:34:23 PM »
I've tested two pairs of advancer springs on a tensile tester at work to measure the spring rate...my original pair has done over 80k km and the spare advancer I purchased had I was told had only done 12k km.

I will try up load the images of the plots but I've been struggling to upload anything from my pc at work.

The interesting thing was both pairs of springs had similar spring rates given their usage. I thought id would be a good starting point to approach a spring manufacturer to try and find some replacement springs.   
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