UK spec bandit 400 ignition coil wiring

[reggit]

OK, it's running again. When I connected the new coils, I cross connected the LT feeds... Doh! No change to the symptoms though.

I have just checked and there doesn't appear to be a great fuel flow from the tank, just a trickle really, certainly not a stream the width of the pipe if you know what I mean. Wondering if the carbs are been starved of fuel - that'd explain a lot. Checked the in tank filters and all OK.

Think I'll rig a fuel feed up from a pop bottle or something to check it with - it's gotta be something studiply simple I think.

Cheers for the help and support so far.

[Variablevalves suck]

If you take the little plate off the fuel tap you can turn it to always on/prime to check the flow and then compare this to the flow using the vacum pipe to see if this is ok, just suck the vacum pipe for fuel.

[reggit]

It's feeble with both, pretty much the same.

Decided to borrow the tank of my CB1000 and use that to supply the fuel in order to try an off load test and see what happens.

[Variablevalves suck]

Checked the parts no.s and thers only one crank no. so thats the same you changed the rotor that has dif no.s and thers about 5 different cdi's but you changed that so not sure about it being electrical, the carbs are worth a good look so you could undo a drain at the bottom of ya carbs and see how the bowls are flowing.

[reggit]

Tried an auxillary tank, made no difference.

Just had another look at the carbs, can't see anything amiss, however I removed the little rubber bungs from the pilot jet, and opened the pilot screw another turn. It's a bit happier, will rev to just under 8k off load.

It makes me think that the problem is carburretor related and nothing else.

Just ordered an o-ring set from a bloke on ebay, worth a tenner to rule that issue out.

[Variablevalves suck]

Hi Reggit , lol the fleebyer is me! sounds like carbs to me too!
If you are grtting the bike to run better by increasing the pilot system then this would indicate either the pilot jets are blocked 'should run the bungs as they make the pilots get their fuel from the mains' or the needles are wrong as they kick in about 4000/5000 rpm and as youve uppd the pilots they maybe covering for the needls as the pilot circuit affects everything to some extent. Or even more possible is the mains are not feeding any fuel hence when you open the bungs the pilots get more fuel from the bowl and you get no mid to full throttle, this could also be due to the needles being way to low/wrong!
Chris. :)

[reggit]

Not sure on the pilots, when I got the bike, they where set anywhere from 1.5 to 6 turns out across all 4 carbs. I reset them to 1.5, but some folk believe 2-3 is a better value so put them at 2.5 The last test I did today was set them as they where when I got the bike, no change.

I'll put the bungs back in tomorrow now I know what they're for.

Looking at the plugs, it looks to be running rich as they are sooty. I would expect it to be a bit on the lean side as I've got the airbox off at the minute.

The mains look to be working - you can see fuel flow from them when the engine's running from about 5k upwards.

[Variablevalves suck]

l.o.l you will need the air box on m8.

[reggit]

Quick update - after fitting the o-ring kit, the bike appears to be transformed. Only tried it off load so far as most of the bike is just lashed together at the minute, but 1st impressions are good.

Still a git to start, however once running it will now rev properly. I've only run it upto 12k very briefly as I don't like caning unloaded engines.

Now to put it back together, charge the battery and take it for a run. That'll be the true test, but it looks like another one down to duff o-rings.

[Variablevalves suck]

Thats very good to hear m8! glad the o-rings have helped. You may need to get the carbs balanced to get the best from the motor, if you get them set up well the B4 has quite a swee6t little motor, next step is a GSXR400 rear end, the bike's are spot on then! Nearly got mine going just waitin for some parts from the anodisors and will post some pics. :D