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Old 05-21-2009, 08:59 PM
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Default Installing stiffer springs on '08 CRF150R

     

Ok, my new bike 'might' be pushing 10 hours. So , it's time for the whole maintenance thing. Oils, filter, etc. I also figured this would be a good time to replace the springs. I was going to pay for the shop to change them for me, but I figured it might be fun to do them myself. Got the rear changed. Very easy. The front I know is going to be a project, so I don't want to start unless I have the time to finish. In my bag is the springs, and the fork oil. After talking to the service guy at the Honda shop, he said I "could" just measure the oil in .oz and pour equal amounts in each tube. Of course, it's best to measure the height, but I don't have a measuring tool for that. I understand the the oil really controls the last 3 inches of travel, and that more oil will be stiffer. So, to make the installation as easiest as possible, I want to just measure the oil in a bottle and pour it in, and reassemble and get riding.

My question, in your experience, am I asking for trouble? How much of a height difference make a noticeable difference in stiffness. I'm not having any real problem with the bike now. But I know I needed heavier springs, and the fork oil need changed. I'm not racing, just play riding, and not all that aggressively.

Any other spring changing tips? Anyone change to heavier springs on the 150R? How drastic of results can I expect from compression and rebound setting changes?

Thanks, Darin (210lb)
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Old 05-21-2009, 11:43 PM
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First off, yes, you can do it -- it's not a tough job.

As far as oil height, you don't necessarily need a the height measuring tool. You can make up something to do the same thing easily enough. You just need to know how many mm from the top it needs to be then use a syringe with a tube attached to the end that is cut to the exact length you need it to be. Then use the syringe to suck out the oil until it's a the desired height.

As far as height. I don't know how the height translates to cc's but in my bike if I have 380cc in each leg and I add 10cc to each leg, I notice it. So in my bike (different forks all together) I can notice 10cc's either way. I would imagine you will notice it too.
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Old 05-23-2009, 03:57 PM
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Done. Done right? I hope so. The manual shows you how to check the oil level, sorta. But the diagrams are drawings, not photos. What I wasn't sure about was, exactly where to measure from? When I did the 2nd leg, I poured the oil into a Ratio Rite, and it came out at 10 oz. Honda shop told me to put 11.6 oz. So, it's pretty close, Although, I probably went with something like 10 back in I'll find out for sure to right way to check it, get a syringe and check em. I'm not sure they are off, or off far though. The new springs make a HUGE difference. They are for 170/200lb rider. Not it feels more like a motocross bike than a plushy pillow trail bike.
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Old 05-24-2009, 01:27 AM
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Right on. It's amazing what the proper springs will do for your ride.
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Old 05-27-2009, 01:38 AM
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Hello,

I am 280lbs and not the 280lbs you would think, i am 6'3" tall and im solid. Most people look at me and think i am 220lbs to 230lbs. Anyhow i had our local mechanic do mine as i am racing and i cant say enough about the difference of how it feels, operates and handles for me. I am now riding the bike rather than having to handle the bike if you know what i mean? It seemed before i got the heavy duty springs for my weight that i was having to work twice as hard in burms and jumps especially but now that it is setup properly i feel that i am riding the bike now and dont hurt when landing a jump like before, as it was set to stock which i believe is approximately 170lbs to 180lbs, i am running a 2004 YZ250 2 stroke.
Anyhow nice job doing it yourself, i didnt have the nerve to do mine myself. Did everything but that!


Cheers!
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