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Post by roberts on Apr 26, 2010 19:51:22 GMT
Hi, Not long bought my 2003 600s divvy. All seems fine apart from a virbration at around 4000rpm which seems worse in 5th or 6th. I can feel it through the footpegs and see it in the mirrors. From reading reviews etc I gather this may be "normal" There are no rattles from the engine and the exhaust is clear. Does this sound OK? Cheers
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Post by TwoHat on Apr 26, 2010 22:05:29 GMT
Hehe! "They all do that, sir." (I've wanted to say that for ages)
Seriously though, I don't know about the 600 but my 900 is a bit harsh and vibraty at about 4000 rpm. Its a bit unfortunate because the vibrations only disappear completely in top gear when you get up to the sort of speed the police take notice of. Its smooth at 3000 or 5000 (and it really starts to make music above that), but it just vibrates a bit at 4000 for some reason. I guess it must be something resonating at that pitch, but its odd that the 600 and the 900 do it at the same revs. Anyone got any ideas if it could be tuned out? It isn't a serious problem to me, it just knocks the edge off what could be perfection.
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Post by CD on Apr 26, 2010 23:58:18 GMT
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Post by bobh on Apr 27, 2010 10:51:07 GMT
I always notice the vibes at first when I set off on the 600, but after a few miles I get used to it.
4 to 4.5K rpm seems to be the normal vibration range on the 600. This equates to around 50 mph in top on the 600N (a bit more on the 600S). So the answer is simple - use 5th in the 50's. Generally bike engines are more efficient at above 50% of redline revs anyway, and you'll get more control in the twisty bits.
If mirror vibration is a real problem, check if you have original mirrors, as they have big weights inside them to bring their natural frequency down below that of the engine vibrations - aftermarket ones don't. The weights can come loose inside, which makes a worrying rattling noise until you work out where it's coming from, as well as making them less effective.
Also check if you have the original bar end weights, or better still swap the bars and weights for later ones, which have heavier screw-in weights. The bars from a 900 also have the heavier weights, but have more rise - I don't know if they would fit a 600 without having to extend e.g. the front brake hose.
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Post by CD on Apr 27, 2010 14:59:22 GMT
The 900 bars are taller anyone using Rox risers who finds them too tall could maybe fit 600 bars to the 900. I haven't tried, it's just an idea.
The 900 bar ends are not that heavy I suspect they are made of zinc diecast. I did consider making hollow steel bar ends and filling them with lead, but they are not as simple as they look.
Oddly enough the 600 bars ends are rubber mounted. I cant see how that can help reduce the vibes but I was too chicken to rip them out and try some heavy end weights.
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Post by m40man on Apr 27, 2010 15:04:32 GMT
.... Oddly enough the 600 bars ends are rubber mounted. Neither of my D6's had rubber mounted bar ends . (A 1995 & a 1997 model.)
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Post by HRHpenfold on Apr 27, 2010 17:16:06 GMT
.... Oddly enough the 600 bars ends are rubber mounted. Neither of my D6's had rubber mounted bar ends . (A 1995 & a 1997 model.) and none of the 7 that I owned had rubber mounted bar ends
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Post by tyer0667 on Apr 27, 2010 17:22:18 GMT
Ive got a 93 l reg xj 600 which also has got vibration between 4000 to 4500 rpm, i was told this is quite a common problem with all yamaha 600 and 900 diversions. i find staying in 5th gear until getting to 40 to 50 mph helps keep vibration down. hope this helps.
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Post by roberts on Apr 27, 2010 19:13:21 GMT
Thanks to you all for your replies. I will stop bothering about it and try and avoid the rough spot by holding on to 5th gear for longer. I can live with the mirror vibration but will check to see if they are original.
Cheers
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Post by CD on Apr 28, 2010 19:14:10 GMT
We have had a few folks asking about gearing the D6 up to lower the revs at speed. To be honest there is no point the engine sits in its sweet spot and you only have to drop one gear if you want to get a bat on. Its happy to spin so just let it go.
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griffs
Scooter Rider
Posts: 70
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Post by griffs on Mar 14, 2011 15:10:08 GMT
Probably a bit late to reply to this, but I will anyway.
I am a complete newbie to bikes.
I recently passed my test and acquired a 1991 XJ600 for a friend who passed away. I didn't know it but he had stored this bike for 12 years plus in his garage and not used it so I bought it off his wife. It has only done 6,000 miles. I had to do some work to get it running as the carbs were full of glue, as was the tank, but now it is running fine and i have clocked up 1000 miles already.
I changed fluids in brakes and engine, but not the forks. Forks are a bit sloppy so I intend to do this weekend if it is straight forward.
Anyway, it has a horrible rattle at 4,000 rpm which I felt all through my body.
I concluded it was the front fairing, the top piece around the clocks held in by plastic pins which had too much play. I removed the whole fairing and replaced the pins with bolts with plastic washers. Vibration is completely cured.
Now to the forks.
and then to the brakes which compared to the CBR I learnt on are a little poor. I ordered some sintered pads so hopefully this will improve things.
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Post by cam7777 on Mar 14, 2011 19:43:31 GMT
Vibration is sometimes caused by the chain when it's on the way out.
Maybe check for tight spots and seized links.
I bought a Honda CB900 hornet a while back which had a nasty vibration, the chain looked fine but on closer inspection it had some stiff links, a new chain and sprockets later and it rode like a different (smooth) bike.
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Post by sausageroll on Mar 26, 2011 11:42:05 GMT
I read all the tips and went looking. Both mirrors have loose mass weights in them, the headlight is loose in the fairing and the clocks are buzzing against the surrounding plastic. And I wondered why it rattled.
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Post by mattytowel on Mar 26, 2011 13:17:39 GMT
Hello sausage roll. When I bought my D6 a month ago the inter weight on one of the mirrors was loose, I drilled a couple of 5mm investigatory holes and found that it the weight looked like it was supposed to be stuck with sticky backed plastic to the mirror housing. I drilled another hole in the bottom edge (2 now in bottom, 1 in top) and fired a few pumps of black mastic in the bottom holes, taped over the holes and used a thin screwdriver in through the top hole to push the weight into the mastic, then I left it all alone for a week. I've done 60-80miles so far and the weight in't loose yet. Does vibe at 4000-4500rpm, going to do oil change adjust chain and look for a valve shim tool to borrow in Manchester/Salford/Haydock area.
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Post by bobh on Mar 26, 2011 20:21:21 GMT
Vibration at 4-4,500 rpm - they all do that, Sir. Well, the 600's do, the 900's do it about 1,000 rpm slower.
Annoying, particularly with all these 50 limits around now. "Sorry, officer, I can't stick to the speed limit because my bike will vibrate itself to bits." A new one for the big book of excuses, anyway.
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Post by cam7777 on Mar 26, 2011 20:30:30 GMT
The new model XJ6 has a vibration patch between 6-7k (70-80mph )
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Post by newell on Mar 27, 2011 14:48:24 GMT
That's a bit of luck then Clive. JUst above your normal cruising speed.
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Post by cam7777 on Mar 27, 2011 16:18:23 GMT
That's a bit of luck then Clive. JUst above your normal cruising speed. ;D
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