Bandit 1200 Assistanc?

[instigator]

Hi

More or less just bought a 1997 Bandit 1200. It's an import, bought from D&K. It has a km/h clock but a blue whatchamacallit it fitted between the speedo cable and the clocks making me think it converts it into MPH...

Great bike, having an absolute blast on it, feels like a much more practical machine than a sports bike around London for sure.

Anyhoo...a few points I've noticed on it.

- Once it's warm, it spits and gargles not only on the over-run but also at idle...not 24-7 but pretty frequently. This will be down to the viper race can on it most likely.

- Take off from the lights isn't very smooth - the fueling is obviously off and is only smooth after 2.5k. So I have to overcompensate with the throttle a bit.

- On idle and low rpm in 1st, it occasionally makes a "tsssst" noise like air escaping and the revs drop a slight amount...to a more normal level. The revs don't drop down from 2k-1.4k as quick as they should really. Since it's occasional and only generally at idle, I suspect it's not an air leak from the downpipes.

I understand that the original bandit exhaust strangles the machines power and that by slapping on an aftermarket can, like the previous owner has done, can release a few bhp. I want to sort the fueling out myself and wish to know the best approach to take. Strip the carbs apart and find out what size of jets it has, upgrade/downgrade them and then balance the carbs? For all I know, it could be jetted for a full system.... I may perhaps remove the viper can and slap on twin stubby cans, depending on how secure I feel my job is this month.

I imagine the fueling will be just as bad with them on but the theory behind the work will still be the same. Only thing I don't intend to do is to chase more bhp, I'm happy with it's power delivery as it is so don't want to faff about with a dealer, fitting dynojet kits if I don't have to.

Any suggestions?

[Keir]

my suggestion:

leave bike as it is and pay mr dyno man £250 to sort the fueling properly. not only will this save you the hassle of faffing with needles and jets, but he will have the equipment to measure air/fuel ratios properly.
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Current : '08 Yamaha FZ1s
Previous: '99 Honda CBR 600FX, 03 ZX636 B1H, 99 Fazer 600 (red), 02 GSX-R 600 K2, 00 SV650s (red), 2008 ZX10R, 97 Bandit 1200N, 04 ZX6RR K1H, 04 GSX-R 1000, 98 Fazer 600 (gold), 05 Madness 110 Pit bike, 04 CR125R, 00 SV650s (black), 06 KTM 625 SMC, 99 SRAD 600 track bike, 03 SV650, 98 Bandit 1200N, Bandit 600SY, 03 GSX-R 600 K3, 01 GSX-R 600, 01 Fazer 600 (black), VFR 400 NC30 x3, 78 Honda Dream, 00 Speedfight 50

[Kickstart]

Hi

Race can and a dynojet kit on a 1200 Bandit should see 115~120hp with a pretty decent power delivery.

Pretty much agree with the above comment of spending a bit getting it set up on a dyno. Although well worth checking things over first (eg, check the pipe for the vacuum tap is not split, the carbs are seated properly, float heights are OK and the diaphragms are in decent condition).

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[instigator]

To be honest, if paying £250 for someone else to set it up is the only way to sort it out, I'd rather return it to standard by buying the OE can and putting that on. But then again, I don't know what the bike is set-up for...?

As you can tell, power gains, I couldn't care less about. I like the noise but it isn't worth £250 to me. I'd rather faff.

Suppose I could always look out for a 2nd hand set-up, carbs with dynojet kit fitted and with a can and sell of the parts that I have.

[NiteMare]

[Pete.]

If it already has a dynojet kit the emulsion tubes might be worn oval. Common on the bandit 12 as I understand.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[sickpup]

Been having a bit of a clear up this weekend and found a box marked up as Dynojet GSF1200 96-00

Looks like bits are missing, may have been fitted to a bike but it still has the 100, 104,150 main jets new in the wrappers. A set of used 102.5 main jets, a set of springs and a set of needles marked up as 5D76 (springs and needles may well be the originals out of a bike) as well as shims.

The smaller jets are what you would use for stage one.

The large for stage 3.

Let me know if its any use to you.

[Robby]

You bought it from D&K. They are known on this forum, no?

So the first thing I would do is give it a really good check over in daylight for any air leaks on the inlet or exhaust side. If this doesn't fix it, clean the carbs and see how worn they are, and what jets (and if they are normal jets or dynojets) it is running.

This gives you a good baseline. For gypsy dynoing you can try to find someone with the same setup and see what jet sizes and settings they are running, jets are cheap.

[NiteMare]

[Finglonga]

[instigator]

[NiteMare]

the "split hose" that's occaisionally hissing "could" be the vacuum pipe that goes from the top of one of the carbs to the fuel tap ...

which would mean you are sucking air in on that cylinder and "leaning" the mixture out , which in turn will give you rough running
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it ain't broke...

i ain't fixed it enough

[chris-red]

It's an IL4 there not suppose to run well below 2.5 revs. Even my TDM900 which is a Twin with a 8k redline doesn't run too well below 2.5k. Generally when riding il4's I don't let the revs drop below 4k.
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[Finglonga]