HRC Valve Springs - 600RR.net
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post #1 of 7 (permalink) Old 04-10-2014, 05:25 AM Thread Starter
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HRC Valve Springs

Might sound a bit naive but can someone tell me what the benefit is to having the HRC valve springs over the standard honda springs. Do you need these spring when fitting the hrc cams or is there any benefit to fitting the springs with the standand honda cams?
Reason I'm asking is, I've got the option to buy a set of new hrc springs cheap and my head is currently getting a rebuild so it's a good time to buy and fit them if there's a good reason to. Any info would be a great :)


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post #2 of 7 (permalink) Old 04-11-2014, 02:41 PM
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The only reason you might consider getting them is if your stock springs are out of spec. A good head rebuilder would check them and if there good, there's no possitives to the HRC springs, just slightly harder on seats, lifters and cam, but not much.
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post #3 of 7 (permalink) Old 04-11-2014, 04:37 PM
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Recommended if you get the whole HRC power up package.

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post #4 of 7 (permalink) Old 04-11-2014, 07:00 PM Thread Starter
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Ok cheers lads. I measured my original springs and they all seem to be well within spec, so no point in buying these HRC ones then even if they are cheap.





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post #5 of 7 (permalink) Old 04-13-2014, 06:17 AM
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the stock springs are double - inner and outer.

quite often kit springs will be a single spring to reduce weight on the valve allwoing it to rev quicker and higher. they will not last as long as the stock items.
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post #6 of 7 (permalink) Old 10-07-2014, 03:04 PM
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I had to take those when I was rebuilding the head of my engine with HRC cams
it's advised to use HRC springs when ugrading your cams with the HRC ones
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post #7 of 7 (permalink) Old 01-12-2015, 08:55 AM
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If you use higher duration camshafts and want to exctend the rev limit of your bike this is the way to go. We rev our cbr up to 16500rpm using those springs. If your motor is stock, stay with oem springs.

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