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My Bandit (Aka 'Ride On Dildo')

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Paracaine
Nitrous Nuisance



Joined: 04 Jul 2005
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PostPosted: 11:05 - 31 Aug 2005    Post subject: My Bandit (Aka 'Ride On Dildo') Reply with quote

Hey, I have a problem with my Bandit.

From around 5,000 to 6,500 rpm the bike vibrates quite a lot (handlebars, footpegs and tank). It gives me numb hands after a little while. This rev range tends to be when I am doing 60-70mph so it is very annoying.

I will also mention that the bike has a 33bhp restrictor in each carb.

Any ideas?

Thanks
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Bike: Suzuki Bandit 600, 2002, Blue
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mchaggis
World Chat Champion



Joined: 09 May 2004
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PostPosted: 11:12 - 31 Aug 2005    Post subject: Reply with quote

I found exactly the same thing on a Fazer. The solution: change gear. Smile
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Paracaine
Nitrous Nuisance



Joined: 04 Jul 2005
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PostPosted: 11:18 - 31 Aug 2005    Post subject: Reply with quote

I'm doing 60-70mph in 6th gear and it does it...

I'm thinking if it wasn't restricted then I wouldn't need to rev as high as 5-6k rpm to do 60-70 in 6th gear?
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Bike: Suzuki Bandit 600, 2002, Blue
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knockout_bar
Scooby Slapper



Joined: 06 Jul 2005
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PostPosted: 11:20 - 31 Aug 2005    Post subject: Reply with quote

Paracaine wrote:
I'm doing 60-70mph in 6th gear and it does it...

I'm thinking if it wasn't restricted then I wouldn't need to rev as high as 5-6k rpm to do 60-70 in 6th gear?


You'd still need to pull the same revs even if it was derestricted. Unless you change the sprockets.
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mchaggis
World Chat Champion



Joined: 09 May 2004
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PostPosted: 11:23 - 31 Aug 2005    Post subject: Reply with quote

Paracaine wrote:
I'm doing 60-70mph in 6th gear and it does it...



Similarly with the Fazer, but 5th works fine for that speed I found. I just being facetious really, because I don't know the answer other than perhaps fitting heavier bar ends. That'll move the vibrations lower in the rev range instead, hopefully below where you'd ever normally be. Checking whether all the bolts you can find are properly tightened up could help too.
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Paracaine
Nitrous Nuisance



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PostPosted: 11:28 - 31 Aug 2005    Post subject: Reply with quote

At the moment I have big ass heavy bastard bar ends.

I might try some normal ones and see how it is.
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mr.z
World Chat Champion



Joined: 04 Feb 2004
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PostPosted: 12:41 - 31 Aug 2005    Post subject: Reply with quote

Borrow a gps from a friend and check that 70 is 70... you may find that 70 is more like 65, so you can do an indicated 77 and be perfectly legal... also takeing you out of the iffy rev range, and you'll be shifting a little more

(of course you can go over the limit anyway, but most people think their doing 80 and are only 2/3mph over the limit)
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Paracaine
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Joined: 04 Jul 2005
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PostPosted: 13:17 - 31 Aug 2005    Post subject: Reply with quote

I ordered a PDA and a GPS receiver a few days ago so I will be able to find out myself.

I have bought some different bar ends as well because my current ones are crap.
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Bike: Suzuki Bandit 600, 2002, Blue
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Robby
Dirty Old Man



Joined: 16 May 2002
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PostPosted: 15:39 - 31 Aug 2005    Post subject: Reply with quote

Sounds like the carbs need balancing to me.

Also worth going over the major nuts and bolts to make sure they are all done up tight, particularly the ones holding the engine in and the swingarm on.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 16:01 - 31 Aug 2005    Post subject: Reply with quote

robby wrote:
Sounds like the carbs need balancing to me.


Agreed. I bet they didn't balance them after fitting the restrictor kit.
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Paracaine
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Joined: 04 Jul 2005
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PostPosted: 17:46 - 31 Aug 2005    Post subject: Reply with quote

stinkwheel wrote:
robby wrote:
Sounds like the carbs need balancing to me.


Agreed. I bet they didn't balance them after fitting the restrictor kit.


No, they didn't.

Can you explain how this could be a problem?
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 20:58 - 31 Aug 2005    Post subject: Reply with quote

Paracaine wrote:


No, they didn't.

Can you explain how this could be a problem?


For your engine to run smoothly, all four carburettors need to be supplying exactly the same volume of fuel vapour into the engine. Minute differences in the sizes of the carbs, wear on the bores, opening of the valves etc. mean that setting the carbs to a visually identical setting does not supply this identical flow. This means one cylinder gets a bigger 'bang' than another causing vibration.

If you measure the vaccuum being generated by the engine sucking air through the carbs and adjust the carbs so this vaccuum is identical for each cylinder, the engine runs smoothly.

Fitting a restrictor kit involves partially dismantling the carbs and inserting baffle plates in the inlet. The addition of these componants will disturb the balance both because the carbs have been dismantled and because of slight differences in the shape/size of the restrictors themselves.

The engine is easily balanced by an engineer using a set of vaccuum guages that screw into the top of the carb manifold (there are blanked off holes for this very purpose). He just tweaks each carb until the vaccuum is equal for all four.

It is best practice to balance the carbs after any dismantling. Also should be done periodically as part of routine servicing.
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I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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mylow
Borekit Bruiser



Joined: 31 Jul 2005
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PostPosted: 09:55 - 01 Sep 2005    Post subject: Reply with quote

can I just ask what model you have,
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Paracaine
Nitrous Nuisance



Joined: 04 Jul 2005
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PostPosted: 10:12 - 01 Sep 2005    Post subject: Reply with quote

2002 Suzuki Bandit 600cc - Unfaired
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Bike: Suzuki Bandit 600, 2002, Blue
Type: Unfaired
Extras: Datatool Alarm & Immobiliser, Airblade Tinted Fly Screen, Motrax Crash Protectors
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the grim reaper
World Chat Champion



Joined: 29 Jun 2005
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PostPosted: 12:28 - 01 Sep 2005    Post subject: Reply with quote

You may also find that balancing the carbs may not get rid of the vibration but it may shift it to somewhere else in the rev range. A lot of bikes have a flat spot to get through the sound/emissions tests, this often coincides with the vibration as the engine is not running in optimum fuelling/ingition mode.

Cheers

Grim
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