stuboy
Drag-strip hero
Posts: 274
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Post by stuboy on Oct 4, 2011 11:59:44 GMT 1
What can be gained by a box section swing arm when you are using the same pivot point?
I find it hard to believe that the swing arm is flexing.
Short commings on the forks and the rear shocker yes but not swing arm flex !!
Going into a corner at 90 mph on a bike that feels like it is hinged in the middle is surely down the the fact that forks are flexing and the mono shocker is mounted too high ??
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Post by Norbo on Oct 4, 2011 12:22:48 GMT 1
its likely to be a few things the forks are the main week point . a better shock will improve as well . but i know that a box section swinger does help the handeling as in some race classes you are kn to do this mod and people say the lap times got better and it felt more planted . i know this is on race bikes but i do think they help some even on the road . a cheep was to do this is weld the A frame of an lc swinger on to a 31K ypvs swinger .
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Post by trev1340 on Oct 4, 2011 20:43:00 GMT 1
mine felt like that when going over the top of the old bluebell hill lent over felt like it was gonna fall in half didnt get chance to try anything as i crashed it and bent the frame still hope my hybrid handles when its finished ;D
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Post by ivymike on Oct 4, 2011 21:24:49 GMT 1
hi did rgv / rd hybrid. felt loads more planted was much faster on the road. a bloke who races in past masters rode it and was well impressed, only problem is the expansion chambers deck out sometimes when im on a mission. it well worth stiffening front and rear end up though, will give you a lot more confidence.
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Post by stanlc7189 on Oct 5, 2011 23:28:46 GMT 1
Mine weaves like a b----rd at anything over 90 mph - feels most unstable, especially into a headwind I think the problem is the front end going light due to increased air pressure at high speed. A stiffer rear shock would definitely reduce the weight transfer to the rear wheel, making it more stable. I don't want a steering damper 'coz they look naff on an LC.
I don't ever remember my first LC being like that, but I think we just accepted them as they were - and they were supposed to be the best handling bikes ever to come out of Japan!
The LC's role today is simple. It helps us to realise just how good modern bikes are and is a reality check! A ride on the LC followed by one on my GSX-R puts it all into perspective. If I had to keep only one........it would be the LC though!!!
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Post by billy on Oct 6, 2011 19:05:48 GMT 1
Mine weaves like a b----rd at anything over 90 mph - feels most unstable, especially into a headwind I think the problem is the front end going light due to increased air pressure at high speed. A stiffer rear shock would definitely reduce the weight transfer to the rear wheel, making it more stable. I don't want a steering damper 'coz they look naff on an LC. I don't ever remember my first LC being like that, but I think we just accepted them as they were - and they were supposed to be the best handling bikes ever to come out of Japan! The LC's role today is simple. It helps us to realise just how good modern bikes are and is a reality check! A ride on the LC followed by one on my GSX-R puts it all into perspective. If I had to keep only one........it would be the LC though!!! I think you should really use a steering damper mate, they make it a whole lot safer! I will never take mine off! I've had tank slappers before, never want to experience it again lol. If you're bike is nervous, it could be because you have a lower front end and/or higher arse? My LC was HORRIBLE when I had a jackup kit on the rear shock AND forks lowered a tad in the yokes. I changed back to the stock ride heights and it became alot more stable, but the wobbly feeling was still there and then I put an el cheapo steering damper on and MY GOD, it truly helps!  Thing feels safe enough now with the damper, I'm thinking about putting a 125 shock on to pop the rear up a tad (not as high as it was before though). |
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Post by stanlc7189 on Oct 6, 2011 22:05:04 GMT 1
Cheers for that Billy. I can make the bike less nervous by leaning forward and shifting weight over the front end. That's what makes me think the rear end squats down once the speed gets up and the windblast against me forces the front end to go light.
If the bike is low at the front with a high rear as you suggest, that would make it even more nervous 'coz the trail would be less and it would quicken the steering making it more sensitive/nervous. If I check the ride heights and get those right and a stiffer rear end plus steering damper (can you get them that look OK rather than hanging off the rad?), could that do the trick?
Stan
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Post by billy on Oct 6, 2011 22:31:48 GMT 1
Cheers for that Billy. I can make the bike less nervous by leaning forward and shifting weight over the front end. That's what makes me think the rear end squats down once the speed gets up and the windblast against me forces the front end to go light. If the bike is low at the front with a high rear as you suggest, that would make it even more nervous 'coz the trail would be less and it would quicken the steering making it more sensitive/nervous. If I check the ride heights and get those right and a stiffer rear end plus steering damper (can you get them that look OK rather than hanging off the rad?), could that do the trick? Stan Yeah I think you shall avoid having a low front and/or too high rear, at least if not having a steering damper. There are steering dampers that you can mount around the handlebar mounts, (they are attached down at the top of the hedastock aswell if I'm not mistaken, but it isn't very visible) but personally I think they look like crap, and I don't think there is any kit available for RD's anyway. Your other choice would be to mount a small damper on the bottom of the headstock, but this requires welding on the frame, and unless you mount the damper behind the bottom yoke (which I don't even know if it's possible or not) there may be horns & horn brackets and stuff in the way so alot of fiddeling to get it to look nice. This is one way of mounting a small damper around the bottom yoke:  The image is from nikfubar on this forum.  |
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Post by stanlc7189 on Oct 7, 2011 17:50:01 GMT 1
Cheers Billy
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Thing feels safe enough now with the damper, I'm thinking about putting a 125 shock on to pop the rear up a tad (not as high as it was before though). 