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Offline Ace Venture

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Unstable CRF230
« on: April 24, 2012, 07:58:15 pm »
My missus recently bought a CRF230, we had to lower the front shocks by about an inch as she was a bit short.
She has been complaining about the bike being unstable at high speed, I told her to try get used to the bike first but today I could see it was all over the place.
Is this bike naturally unstable, or could the lowered shocks make such a difference?
 

Offline wrench

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Re: Unstable CRF230
« Reply #1 on: April 24, 2012, 08:08:46 pm »
Pulling the forks through will make the bike nervous, pulling it through that much on a CRF230's soggy suspensio would make it unrideable. You have lower the rear ride height aswell to make the bike safe.
 

Offline Parkinoff

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Re: Unstable CRF230
« Reply #2 on: April 24, 2012, 08:28:47 pm »
Hi. Indeed Wrench, lowering the front forks (and not the back as well), reduces the steering head angle - which will make the bike progressively more responsive at low speed but the trade-off is instability at speed.
My rides:

Super Hex TTI Alexithymia with completely unnecessary, but very expensive Nemophilistic suspension. Electroflux Gogglemaster Oenophilia Edition. 1983 (very rare) Yonderly Bawhair with heated grips.
 

Offline Ace Venture

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Re: Unstable CRF230
« Reply #3 on: April 24, 2012, 08:32:39 pm »
Make it unrideable. ....the Honda dealer advised us to do that >:(
Will put it back how it was and buy her some taller boots. Thanks!
 

Offline Parkinoff

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Re: Unstable CRF230
« Reply #4 on: April 24, 2012, 08:41:50 pm »
That is a lekker bike. Turn the rear pre-load up (loosen it) until the bike sits level again - and it should handle even easier for a girl due to the lower c of g.
My rides:

Super Hex TTI Alexithymia with completely unnecessary, but very expensive Nemophilistic suspension. Electroflux Gogglemaster Oenophilia Edition. 1983 (very rare) Yonderly Bawhair with heated grips.
 

Offline Ace Venture

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Re: Unstable CRF230
« Reply #5 on: April 24, 2012, 09:14:05 pm »
Thanks Soul Eater, looks like we will have to spend some time playing around with the suspension.
 

Offline wrench

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Re: Unstable CRF230
« Reply #6 on: April 24, 2012, 09:20:36 pm »
Make it unrideable. ....the Honda dealer advised us to do that >:(
Will put it back how it was and buy her some taller boots. Thanks!

Your Honda dealer needs a slap across the face!
 

Offline Parkinoff

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Re: Unstable CRF230
« Reply #7 on: April 24, 2012, 09:30:35 pm »
I would play with suspension if I were you because that bike is so easy to ride otherwise. Saw a guy on a white 1150GSA following his girl friend or wife on something smaller heading east on N2 at Grabouw this weekend. She looked very nervous. I felt sorry for her. Make the bike comfortable for her so that she feels safe and you'll enjoy lekker times together. Im riding with my 16 year old son (on KDX220) now and its so good to see him learn to ride sand etc. and I can teach him to ride safe. This weekend he asked me how far he can lean his bike safely when cornering on tar!? Dunno how to answer that one!
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Super Hex TTI Alexithymia with completely unnecessary, but very expensive Nemophilistic suspension. Electroflux Gogglemaster Oenophilia Edition. 1983 (very rare) Yonderly Bawhair with heated grips.
 

Offline edgy

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Re: Unstable CRF230
« Reply #8 on: April 24, 2012, 10:00:09 pm »
These little bikes are terrible,get rid of it! How much you wanting? :biggrin:
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Offline zacapa

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Re: Unstable CRF230
« Reply #9 on: April 24, 2012, 10:50:48 pm »
Dropping the front forks 25.4mm will make fokol difference in the way the bike performs other than a possible binding of front wheel against the mudguard on full compression and a slight quickness on steering response. CRF 230 is by nature a very stable bike that likes to go straight by nature.  Have a look at the rear shock and check that Missus levels out at 1/3 travel rear shock in when sittin stationary on bike ie. static sag is ok. Check stearing head bearings for happiness.
 

Offline nemodakar

Re: Unstable CRF230
« Reply #10 on: April 25, 2012, 06:25:12 am »
Wheel alignment?
 

Offline ETS

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Re: Unstable CRF230
« Reply #11 on: April 25, 2012, 08:33:01 am »
What type of speed are you talking about?
If i had to explain you would not understand anyway......
 

Offline jaybiker

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Re: Unstable CRF230
« Reply #12 on: April 25, 2012, 12:21:48 pm »
This is strictly "wrong" advice, but it has worked for me on more than one bike with no detrimental effect.
Put a little bit of preload on the steering head bearings.
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Offline RobC

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Re: Unstable CRF230
« Reply #13 on: April 25, 2012, 12:42:07 pm »
Dropping the front forks 25.4mm will make fokol difference in the way the bike performs
Clearly this has been the case... ::)
Lowering the front suspension will always have an influence, you have to drop the back as well to get it back to more or less design specs with regards to the geometry.
 

Offline Ace Venture

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Re: Unstable CRF230
« Reply #14 on: April 25, 2012, 09:41:22 pm »
Guys thanks so much for the comments, and soul eater it's so true that she needs to feel safe. As it was her first bike she doesn't know what is normal so kinda feel for her.
Edgy, i reckon once we get this this sorted she's not going to let it go  ;)
 

Offline lecap

Re: Unstable CRF230
« Reply #15 on: April 26, 2012, 06:51:41 am »
This is strictly "wrong" advice, but it has worked for me on more than one bike with no detrimental effect.
Put a little bit of preload on the steering head bearings.

:o

Another prime example of myths and nonsense spread by the www ???

Preload will destroy your steering head bearings chop chop. Maybe you call that "no detrimental effects" ???
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Offline 2StrokeDan

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Re: Unstable CRF230
« Reply #16 on: April 26, 2012, 07:40:35 am »
Is daai bike se wiel nie pap nie? :eek7:
Check that steering head bearings aren't already too tight, this makes a bike want to be steered all the time.
 

Offline Pullaway

Re: Unstable CRF230
« Reply #17 on: April 26, 2012, 08:15:06 am »
ace_bots, is the bike unstable when you ride it yourself as well? If so is it unstable with the front shocks at factory settings when you ride the bike yourself?
It's better to burn out than to fade away!
 

Offline Ace Venture

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Re: Unstable CRF230
« Reply #18 on: April 26, 2012, 08:41:48 pm »
Haven't personally had a chance to ride it yet.  I will raise the front shocks back to normal and see how it rides, if it then rides ok then how do I lower the rear?
 

Offline zacapa

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Re: Unstable CRF230
« Reply #19 on: April 26, 2012, 09:33:39 pm »
Rode a CRF 230 for the best part of a 2 years through a few valleys and up some hills. The weekly highpressure wash soon took its toll on the stearing head bearings where it was all notchy and did'nt want to turn as good as factory standard. Solution was to take it apart, clean as necessary and apply good amounts of grease to the turning bits. With lubrious amounts of grease this resulted in a steering head that was AOK. Just thinking....
As per previous post dropping the forks by an inch will change bike behaviour a tiny bit, but if all's not good you gotta look at the root of the problem. Happy Hunting Gotta Ride That Thang and report back with what you found.
regards,
zacapa