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Offline kpchoe1

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Tips for making Rally Raid forks more plush
« on: September 15, 2019, 10:51:51 PM »
I have Rally Raid level 2 on a 2016 CB500X with 10 weight oil.  On sharp bumps or drops, the forks give a harder hit than I would like.  On smooth transitions, it's great.  Lowering the front tire to 20 lbs or less helps, but still not ideal.  Anyone have any other simple tips for making the forks more plush on the sharp bumps or drops?  For example, would less oil or lower weight oil be expected to help with this?

Offline kpchoe1

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Re: Tips for making Rally Raid forks more plush
« Reply #1 on: September 16, 2019, 01:08:11 AM »
Correction.  My forks have 5 w oil. 

Offline timur

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Re: Tips for making Rally Raid forks more plush
« Reply #2 on: September 16, 2019, 08:46:41 AM »
You need to revalve your fork kit. This harshness is produced by high speed compression damping - RRP kit has a lot of them. Maybe this thread could help you:

https://www.cb500x.com/index.php/topic,8704.0.html

Regards

Online Oyabun

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Re: Tips for making Rally Raid forks more plush
« Reply #3 on: September 16, 2019, 12:46:15 PM »
Also you can try to lower the level of fork fluid in your forks. i suggest to remove about 10-15mm at first and follow up on the progress
Background: the amount of air in the forks is constant, but it is compressed down along with the forks, and acts as an air spring, what is active from roughly halfway in the fork travel.
So if smaller bumps are better than the larger ones, it could be either damping or spring related.
« Last Edit: September 16, 2019, 12:49:51 PM by Oyabun »

Offline kpchoe1

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Re: Tips for making Rally Raid forks more plush
« Reply #4 on: September 16, 2019, 02:40:42 PM »
Thank you for the replies so far.  My plan is to first try the simplest possible solutions.  I like the idea of adjusting the oil level and viscosity.

My forks currently have Motorex Racing 5W, which I just learned has a viscosity of 22.6 mm/s @ 40 C.  From searching the forums and other brands, it seems like most 5W fork oils are lower (e.g., ~17 mm/s @ 40 C).  I wonder if my relatively high viscosity 5W is part of the problem.  Motorex Racing 2.5W = 15.0 mm/s @ 40 C and 4.0W = 15.9 mm/s @ 40 C.  I could try one of these lower viscosity Motorex oils, but maybe I risk reducing damping too much and the fork getting bouncy.
« Last Edit: September 16, 2019, 02:41:31 PM by kpchoe1 »

Online Oyabun

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Re: Tips for making Rally Raid forks more plush
« Reply #5 on: September 16, 2019, 04:30:35 PM »
You can also mix fork fluids from the same manufacturer to reach intermediate viscosities.

Offline Prestone

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Re: Tips for making Rally Raid forks more plush
« Reply #6 on: September 21, 2019, 04:14:30 PM »
15@40 seems just right in my level 2 kit with 5.0 springs.

Im 100kg all geared up.

 


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