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Author Topic: Honda CRF250L front end instability  (Read 3695 times)

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Offline Grappa

Honda CRF250L front end instability
« on: March 20, 2015, 12:30:01 pm »
Front end does not feel planted above 100km/l on loose gravel and corrugations. Handlebars continuously oscillating wanting to go into a tank slap. Is this normal? Tried shifting my weight around but made no difference. Running 1.5 bar front and rear, don't want to go much lower, I've learned my lesson with snakebite punctures. Bike bought new and has done about 3000km. Forks not leaking oil. Neck bearings checked, no free play nor over-tightening. Don't have much confidence at the moment. Any advice here?
 

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Re: Honda CRF250L front end instability
« Reply #1 on: March 20, 2015, 02:15:00 pm »
What kind of tyre on the front?
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Offline superfoxi

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Re: Honda CRF250L front end instability
« Reply #2 on: March 20, 2015, 02:54:13 pm »
Front end does not feel planted above 100km/l on loose gravel and corrugations. Handlebars continuously oscillating wanting to go into a tank slap. Is this normal? Tried shifting my weight around but made no difference. Running 1.5 bar front and rear, don't want to go much lower, I've learned my lesson with snakebite punctures. Bike bought new and has done about 3000km. Forks not leaking oil. Neck bearings checked, no free play nor over-tightening. Don't have much confidence at the moment. Any advice here?

You are welcome to bring it around and I check it out...if you are in CT
 

Offline Grappa

Re: Honda CRF250L front end instability
« Reply #3 on: March 20, 2015, 07:16:38 pm »
Front tyre is the original factory fitted issue with low mileage. Many thx superfoxi, I unfortunately live in George
 

Offline chopperpilot

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Re: Honda CRF250L front end instability
« Reply #4 on: March 20, 2015, 08:33:12 pm »
Maybe increase the pressures as an experiment?

I run 2.0 bar in front, and 1.8 at the rear of both my DR 650s. TKC 80 and D606/T63 combinations.

I ride it on all surfaces like that.

My riding buddy has the CRF 250 L. 6000kms. Original tyres. Same pressures. No issues.

What do you weigh?

The CRF is only 13kgs lighter than a DR 650, with tanks full.







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Offline Grappa

Re: Honda CRF250L front end instability
« Reply #5 on: March 20, 2015, 08:49:24 pm »
Weigh 85 odd kg. Must add that I had a 6lt fuel bladder and a tail bag with spare tubes/compressor/tools at the back. Read somewhere before that if you experience issues at the front, problem is probably at the rear.
 

Offline chopperpilot

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Re: Honda CRF250L front end instability
« Reply #6 on: March 20, 2015, 08:58:03 pm »
I am no expert, but do my own experimenting with suspension, carbs etc.

Are there any suspension setting recommendations in the owners manual?

BTW. My riding buddy weighs more than you.


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Offline Grappa

Re: Honda CRF250L front end instability
« Reply #7 on: March 20, 2015, 09:52:36 pm »
Front suspension not adjustable. Rear shock has preload adjustment but it's a major mission to do so. Everything is stock standard. The 1.5 bar tyre pressure is the recommended pressure in the manual for solo and with pillion.
 

Offline GaiasGuardian

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Re:
« Reply #8 on: March 20, 2015, 10:16:12 pm »
Measure your preload on the rear and  check that it is in spec for you weight. My 2c

Had major stability issues with my dr's rear shock that was way too tight for my weight. Race sag was about 80mm. Since then adjusted it to 95mm and all weave and wobbles up to a 120km/h has  bees solved. Not tested any faster, on 2 bar front and rear.
 

Offline GaiasGuardian

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Re: Re: Honda CRF250L front end instability
« Reply #9 on: March 20, 2015, 10:25:31 pm »
Front suspension not adjustable. Rear shock has preload adjustment but it's a major mission to do so. Everything is stock standard. The 1.5 bar tyre pressure is the recommended pressure in the manual for solo and with pillion.
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Re: Honda CRF250L front end instability
« Reply #10 on: March 21, 2015, 07:42:29 am »
Do the front forks not have airvalves on them.
I had the same problem with my XR650. Got a mountain bike pump and pumped the forks to 0.15bar.

Problem solved
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Offline chopperpilot

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Re: Honda CRF250L front end instability
« Reply #11 on: March 21, 2015, 08:59:11 am »
A DR 650 rider mentioned the same 1.5 bar pressures recommended in the Suzuki owners manual.

Had similar handling symptoms.

Experiment with the higher pressures.


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Offline chopperpilot

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Re: Honda CRF250L front end instability
« Reply #12 on: March 21, 2015, 05:22:38 pm »
If all else fails...sell the CRF...and get a DR!




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Offline Grappa

Re: Honda CRF250L front end instability
« Reply #13 on: March 21, 2015, 06:44:21 pm »
No air valves on front forks. Only modifications possible are change in oil volume and/or viscosity, or different spring rates. Rear sag currently at 110mm, will stiffen however there is not much tread to play with. Will experiment with a higher tyre pressure as suggested, and possibly consider a more aggressive 50/50 front tyre. Copperpilot when I was in the market for a good DR/XR, none were available to my liking, hence the CRF250L.
 

Offline chopperpilot

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Re: Honda CRF250L front end instability
« Reply #14 on: March 21, 2015, 07:27:06 pm »
No air valves on front forks. Only modifications possible are change in oil volume and/or viscosity, or different spring rates. Rear sag currently at 110mm, will stiffen however there is not much tread to play with. Will experiment with a higher tyre pressure as suggested, and possibly consider a more aggressive 50/50 front tyre. Copperpilot when I was in the market for a good DR/XR, none were available to my liking, hence the CRF250L.
Keep us posted on progress!😉


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Offline zacapa

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Re: Honda CRF250L front end instability
« Reply #15 on: March 21, 2015, 08:43:37 pm »
Got my CRF250L to 159km/h indicated down a long hill with the wind from behind. By then she was tracking straight.
 

Offline GaiasGuardian

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Re: Re: Honda CRF250L front end instability
« Reply #16 on: March 22, 2015, 12:23:21 am »
Got my CRF250L to 159km/h indicated down a long hill with the wind from behind. By then she was tracking straight.
O yes Chopperpilot, that's a beaut! So happy with my DR now. Doing my first longish gravel trip next weekend and it's going to be so awesome now that my weave on my bike is sorted. Pressures only masked the symptons I had. When I set my race sag down to the milimeter all my problems have vanished. Stable at all speeds on 2 bar front/rear. STOKED!
If all else fails...sell the CRF...and get a DR!




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Offline GaiasGuardian

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Re: Re: Honda CRF250L front end instability
« Reply #17 on: March 22, 2015, 12:29:28 am »
No air valves on front forks. Only modifications possible are change in oil volume and/or viscosity, or different spring rates. Rear sag currently at 110mm, will stiffen however there is not much tread to play with. Will experiment with a higher tyre pressure as suggested, and possibly consider a more aggressive 50/50 front tyre. Copperpilot when I was in the market for a good DR/XR, none were available to my liking, hence the CRF250L.
Don't know if it's just me but I think every milimeter in the race sag counts. I was on 80mm from the previous owner that must have been quite a bit bigger than me and had wobbles anything from a 100km/h. Set it to 95mm and the wobbles was gone and was very responsive on dirt. Wanted it a bit softer so I set it too a 100mm, but the steering in tight turns didn't feel right, so much so that I went through all the trouble again of adjusting it back to 95mm.
 

Offline chopperpilot

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Re: Honda CRF250L front end instability
« Reply #18 on: March 22, 2015, 12:31:52 pm »
No air valves on front forks. Only modifications possible are change in oil volume and/or viscosity, or different spring rates. Rear sag currently at 110mm, will stiffen however there is not much tread to play with. Will experiment with a higher tyre pressure as suggested, and possibly consider a more aggressive 50/50 front tyre. Copperpilot when I was in the market for a good DR/XR, none were available to my liking, hence the CRF250L.
Don't know if it's just me but I think every milimeter in the race sag counts. I was on 80mm from the previous owner that must have been quite a bit bigger than me and had wobbles anything from a 100km/h. Set it to 95mm and the wobbles was gone and was very responsive on dirt. Wanted it a bit softer so I set it too a 100mm, but the steering in tight turns didn't feel right, so much so that I went through all the trouble again of adjusting it back to 95mm.
👍


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