showa BPF preload question : Honda CBR 1000RR Motorcycle Forums: 1000RR.net

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Old 11-22-2012, 05:41 PM   #1
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showa BPF preload question

hello guys while i am not new to suspensions, this is my first bike with the showa Big piston forks.
as i was adjusting the suspension as a reference point stock settings count from full stiff. with the top compression and rebound i have no problem since they have a physical stop to it indicating that you have reached full stiff.
BUT with the preload adjuster,( bottom one) i do not seem to find a physical stop. it seems the bolt just spins and spins with no stopping. i hear clicks but it doesnt stop.

so my question is, how do i know when i have reached full stiff on the preload of the shock?

needles to say i have researched everywhere online, youtube etc and cannot find an answer to this.
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Old 11-24-2012, 08:05 AM   #2
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If u turn enough, it will stop.
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Old 11-25-2012, 06:40 AM   #3
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Quote:
Originally Posted by supera View Post
If u turn enough, it will stop.
thats true, a buddy and I were tweaking his zx10r yesterday.
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Old 11-25-2012, 06:42 AM   #4
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wrussi, what weight are you and what sags are you getting ?

thanks
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Old 11-26-2012, 12:57 PM   #5
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ok cool thank you guys. im about 160lbs and im trying to get it to about under 3/4 of an inch of sag. i'll play with it this week then i get a chance.
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Old 11-26-2012, 02:07 PM   #6
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That's way to stiff and is going to fire you out the seat when you hit bumps. 20-25mm track 30-35mm road is a good starting point. 3/4 of an inch is very tight
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Old 11-26-2012, 10:15 PM   #7
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from the service manual:
FRONT SUSPENSION ADJUSTMENT SPRING PRE-LOAD ADJUSTER
Spring pre-load can be adjusted by turning the adjuster.
TURN CLOCKWISE:
Increase the spring pre-load
TURN COUNTERCLOCKWISE:
Decrease the spring pre-load
PRE-LOAD ADJUSTER ADJUSTABLE RANGE:
15 turns
PRE-LOAD ADJUSTER STANDARD POSITION:
6 turns clockwise from minimum

Let me know if you need more info.
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Old 05-04-2013, 09:29 AM   #8
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I've had the same experience on both Suzuki Showa BPF and the new CBR1000RR BPF's. From std setting I went back and it passed what would have been the full or zero point, which tells me that turning until it stops isn't necessarily a good thing. I went way past the supposedly full hard and it kept going to an unrated number of turns. that can't be right.

I have no solution for this condition but what I found was going the other way full would some how reset it and counting back to full hard or soft it would get slightly tighter just before full setting. Forcing past that point I suspects puts you in unknown state/range. IMO
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Old 05-04-2013, 01:06 PM   #9
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Check out this link it has a diagram of the internals in a BPF and a write up on how they work - http://www.efnetmoto.com/suspension.pdf
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Old 05-04-2013, 10:47 PM   #10
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Quote:
Originally Posted by wrussi View Post
ok cool thank you guys. im about 160lbs and im trying to get it to about under 3/4 of an inch of sag. i'll play with it this week then i get a chance.
More like 1 3/16"
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