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Post subject: RZ fork shudder
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MJD  Daily Burner Joined: 20 Mar 2007 Total posts: 119 |
And not from eating asparagus..
I'm not much of a suspension expert, in fact none at all. There are two things I feel while riding my RZ350R, apart from the joy of whacking the throttle open:
1. I have noticed a bit of a shudder in my front forks during braking, and peeking down I can see a bit of fore-aft vib., or is it up and down? Can't truly tell yet. The brakes feel smooth, one or two fingers do the job, but..? Fork pressure is 10psi.
2. During moderately aggresive cornering, there is a tiny wiggle. Slow too, like perhaps back and forth about once a second. I don't feel it in the bars so much as my butt but it is hard to describe - kind of like a slow side-to-side wave in the frame. Now, I am wondering, since my butt is more substantial than it used to be (mid 190's, pounds not kg here mate), is this a preload issue? Frame flex? My seating position? Lousy riding?
Thx,
Mike D.
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Posted: Mon Jun 16, 2008 6:10 pm
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griffinslc Powerband Master Joined: 30 Oct 2006 Total posts: 715 Location: dublin,ireland |
rzs all wobble round corners till you stick decent set of springs n some heavier oil in there.i used to get massive tank slappers till i sorted them out
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Posted: Mon Jun 16, 2008 8:12 pm
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Bare All-gear Wheelie! Joined: 28 Jan 2006 Total posts: 1919 Location: Vancouver Canada |
Often RZ forks are worn
IMO a Mfg defect. The slider bushes are not quite the right size.. from new.. and consequently wear quickly. Annoyingly the only way to be sure is to disasembele the forks, wash everything unitll oil free then reassembele them Dry.. If theres's wear induced play between tube and slider it will be very evident... an needs fixing
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Posted: Mon Jun 16, 2008 8:33 pm
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Pat. Suburban Commuter Joined: 06 May 2006 Total posts: 61 Location: Watford |
Yep, fork bushes mate.
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Posted: Mon Jun 16, 2008 10:10 pm
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MJDDaily Burner Joined: 20 Mar 2007 Total posts: 119 |
Okay folks, thanks. Sounds like there is a concensus among y'all, so I'll bet that's just what it is. It's not "too bad" at the moment (sounds like I'm not too dead..) but it sure isn't the most settling feeling. I usually ride with the steering damper somewhere between 6/10 and 10/10, though I forget how many clicks there really are. The rear has a Fox shock, but the front is all stock to my knowledge.
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Posted: Tue Jun 17, 2008 2:45 am
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GHSuburban Commuter Joined: 16 Apr 2005 Total posts: 74 |
Just a thought - are the steering head bearings adjusted/tightened correctly or worn?
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Posted: Tue Jun 17, 2008 5:43 am
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MJDDaily Burner Joined: 20 Mar 2007 Total posts: 119 |
| GH wrote: |
| Just a thought - are the steering head bearings adjusted/tightened correctly or worn? |
I believe so, and they are pretty new. The engine and frame have about 6000km on them. Maybe there is an issue with them, but they went over it pretty thoroughly at the shop last year before I took it away. I'll look into this.
One question: would the worn bushings or possibly steering head bearings explain both phenomenon (I got it spelled right on the third try) that I described earlier? Number two might also be described as a gentle "squirming".
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Posted: Wed Jun 18, 2008 1:42 am
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BareAll-gear Wheelie! Joined: 28 Jan 2006 Total posts: 1919 Location: Vancouver Canada |
it's a process of elimination.. Fork bushes are incorrectly made on the earlier RZ's IMO . (possibly later ones, but Dunno about those)
IF they are a Bugger to pull apart then they are poorly made . (the top bush gets destroyed on removal an obvious tell tale, as on other Forks there is No damage on removals)
Seems the bushes are too big for both the hole in the Ali bit and to fit the Chrome slider tube. Difficulty in fork separation/ removal is the first obvious symptom.
When you get new bushes .. and they are not free..you will have to file the ends of the Biush (top one is usiually the problem) as you would a piston ring UNTILL it actually closes onto the Chrome tube, important bit that, as they do not fit well, right out of the Yama package
Once satisfied with that fit the things will much more easily fit into their homes in the Ali Bit.. as they are supposed to. The Bushes were made too big and the ends touch before they fit into the ali OR clamp tightly onto the Chrome tube. Do assemble the things.. DRY (no oil ) then try for sideways slop/wiggle betweixt Stantion and Slider (tube).. Loose fit equals wiggly forks and rapid wear.
Yamaha quality control is legendary... but I digress.
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Posted: Wed Jun 18, 2008 2:13 am
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Post subject: RZ fork shudder
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ngrujon Sunday Rider Joined: 27 Aug 2003 Total posts: 42 Location: South Africa |
When I raced my new YPVS in the 80's I was horrified to notice I could not even focus on the axle bolt going around a fast sweep at +180 kph.
The only solution is to peen the bushes, which is a long process of stripping and assembling over and over again. Then you have to make sure there is no fork sticksion. As mentioned in previous posts, new bushes dont solve the problem, the forks are just s**t quality. You have to fix them the best way you can. Does it make a difference? Only a little bit on breaking, otherwise no, not really, the bike still shakes and wobbles in high speed cornering, but that's part of its charm ... 
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Posted: Wed Jun 18, 2008 6:37 am
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Post subject: Re: RZ fork shudder
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MJDDaily Burner Joined: 20 Mar 2007 Total posts: 119 |
| ngrujon wrote: |
| ...Does it make a difference? Only a little bit on breaking, otherwise no, not really, the bike still shakes and wobbles in high speed cornering, but that's part of its charm ... |
Hmm. Well, if it shakes and wobbles but doesn't pitch me off, I can live with that. I understand there are those who fit different front ends for improved handling, such as off more modern 600's of some variety(?), but that might be a way-down-the-road project for me. Would such a front end be lighter than stock if so? Is there such a thing as aftermarket bushings, or bushings from another bike that work, like clutch plates from a long list of bikes do?
Thx!
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Posted: Wed Jun 18, 2008 12:45 pm
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Pat.Suburban Commuter Joined: 06 May 2006 Total posts: 61 Location: Watford |
Not sure why, but worn bushes make the forks feel like they have lost damping.
The movement from the front you describe is exactly what I experienced.
Never had any issues with the fit of new items.
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Posted: Wed Jun 18, 2008 5:59 pm
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Pat.Suburban Commuter Joined: 06 May 2006 Total posts: 61 Location: Watford |
Just to clarify, new bushes fixed the problem!!!!!!!!!!!!!!
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Posted: Wed Jun 18, 2008 6:02 pm
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