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We never did figure out what the cause was. We looked at another Bandit that exhibited the same behavior. Warping of the butterflies? Dunno. :(

It's carbureted so doesn't have a throttle position sensor to my knowledge. Our best guess was it had something to do with the butterfly valves in the carbs but he eventually just decided to get used to it and rode the bike for years that way.

@@YermoLamers Weird, mine has a TPS. Mine is a Mk2.

@@williamfoster4268 huh. Then that's something I missed. If I ever see that bike again I will definitely check that out. Thank you!

Not that I know of.

@@YermoLamers the tab you can buy for the song shows D A F# D A D - is that right? where did you learn it? sounds good.

@@elizabethb4634 Thank you. That's kind of you to say. yes. Open D tuning. I forget where I found the tab I have for it. There are several versions floating around net. I think the one I have is for the original version played on TV. The version Klaus plays in his video is much more involved. I just practiced it alone one small section at a time incrementally. It took forever. th-cam.com/video/PWQ8_nOUx2o/w-d-xo.html

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+Michael Whitney We never did conclusively figure out what's causing it. The best guess we have is that the butterfly plates might be slightly worn letting some air through or maybe the bodies themselves have warped a little bit due to age and that's causing air to get by. Not sure, just guessing. My buddy has just learned to live with it. It sounds like you need to balance your carbs.

@@YermoLamers sounds like he needs to clean them. You sound like you need to clean yours too. It's the words we don't want to hear. I payed $300 to get mine done and then it sat up for 2 years and all the money was wasted lol. My bandit runs like a bag of shite and I'm spending a fortune on tools to fix it all lol. Got all the tools to do it and more on the way, but I'm just a lazy cunt, it's cold currently and I can't be bothered. There's your answer lol.

Thank you so much for all your input I been through the carburetors two times but I've only check the float height one time so I'm going to go back and do floats again maybe I got something wrong. The fuel being too high in the bowls makes sense. The second time I went to the carburetors I separated them and replaced all the o-rings I also I have not sink them and dialed in each side together. I feel confident that one of these or the combination is it . I also have been through the valve twice and I have them dead on. Thanks again for all the input Be safe happy riding Paul

***** That could be caused by so many things. I'd probably check the rubber boots at the top of the carb over the sliders for dry rotting/cracking. I'd see if the sliders are sticking at all.

Thank you for the tip, i will check and i will get back to you.

We replaced the petcock which had a new diaphragm. Good idea, though.

Yup. the carbs are synced as close as we can possibly get them. Same problem exists on 3 others bandits we've looked at. It's very weird.

Yermo Lamers How about spark's threads? Are they ok on every each cylinder?

194Easy Oh that's a good suggestion. I can see how that might cause it. But yes, we did check the spark threads, did both compression and leakdown tests.

Yea, we swapped the ignition module as well. Interestingly, 3 other bandits we've looked at all exhibit the same symptom.

Yermo Lamers Really weird... If it's not ignition related, it has to be something in the carbs. Maybe the "butterflies" are sticking, or the springs or jets are not to spec. Were the carbs tuned/rejetted? Maybe those 3 bandits were serviced with the same incorrect part. The carb breathers cant play a part on that, its too precise. Does it also happen when riding? Like, if it starts "pushing" more, over the 1600rpms?

***** We cleaned the carbs, two sets, and put new jets (and everything else) in them. It jumps from 1600 to 2500 every time but after that the bike runs perfectly. We spent some months trying to track this down to figure it out. Some have suggested it's just endemic to this model since some people who own these bikes have said it doesn't happen but then you ask them to try to keep the RPMs at 1700 and they realize they can't. My buddy has been riding his bike now and compensating for the jump to the point that he now almost doesn't notice it. It just sounds like he's revving it a bit high when launching.

I actually bought an ultra-sound cleaner for exactly that purpose. :)

Carbs are balanced as close as we can possibly get them (unless we've done something wrong in the process). But over two carb rails the exact same problems exists. Interestingly, we came across another bandit of the same year which exhibited the exact same problem. We're suspecting something age related but have no clue yet what it might be. valves, plugs, carbs, sync, filter, vacuum leak checks, etc etc. Moving on to replace the brain box.

Thanks for the comment! Yea, I know. It's really weird. With the bike running we sprayed starting fluid all over the place to see if it would reveal a vacuum leak, but no joy. Then we thought maybe head gasket. Leak down test and compression are fine. Then we thought may bypass ports, etc. etc. real head scratcher.