Ya its weird they work perfectly on %99 of the bikes out there but for the Bandit 1200 they suck dick. I was trying to help a guy on here with his and it was like impossible to tune. For one thing their mainjets they use are actually LEANER than stock so you know how thats going to turn out. Then they make it up by having the float height super rich(11.5!) and having aggressive tapers on the needles to make up for a shitty mainjet. The icing on the cake is you have to use their jets and not standard Mikunis. I have a feeling that the Bandit is so hobbled no amount of fancy needles are going to fix it, you need LARGER jets period. Also the guy who he took it to instead of ordering the proper jets when it was lean, just DRILLED(OMFG!)out the Dynojet jets. So it went from dangerously lean(couldn't even get past 8000 RPM) to horribly rich. The guy finally just gave up. Too bad if he just bought a kit from
www.holeshot.com or asked us we would have told him. He came after the fact when the horse has left the barn and the barn burnt down. I pity the guy who gets that bike as it has to be jetted from scratch. If they know what they are doing they'll pick up a nice bike for cheap if they don't it will just get thrown on the thrash heap of a "problem" bike when all it needs is $12 in jets. A shame.
Whats worse is he bought it stock and he said it was driving fine and the mechanic(you know the wanker who DRILLED the jets) Recommended he get a Dynojet kit and a slipon and all he wanted was a carb sync/clean. Oh man!
I think the real reason they suck for the Bandit is they were made for the GEN1 Bandit which has a slightly different setup with carbeuration. The Dynojet people probably just looked at the engine and said. "Well it's the same engine, so phuck it" But that doesn't work when the carbs are different. So I think the real reason is Dynojets lazyness.
The kit came with 96 98 and 100 Dynojet jets which on the translation table is
87.5 90 and 92.5 Mikuni. Holy leaness batman!!! The Dynojet jets are roughly 4 points below the Mikuni jets!! They mostly line up with the Keihin jets...sort of. Dynojet measure by the hole but Mikuni measure by the flow of CC's/MIN which is more accurate. So even with the Largest mainjet in the kit he is still 4 points BELOW stock. For him to get even just the stock jetting he needs a 106 from Dynojet. For 110 equivilent Mikuni it's a 118 from Dynojet. So you see the problem with their kits. Now they have a crazy ass rich float height so probably the kit should have come with 104 106 and 108's or something, at least 4 or 5 points richer than what's in the kit. They also use a closed airbox and a K&N so they probably don't need it much richer from stock but it shouldn't be LEANER!
I've seen some dyno's from a couple of guys who, by praying to the Dark Gods in their basement, have actually got their kits running ok(jet size unknown) and they give you a few ponies less than the stage 1(around 108-110HP) we normally do. I believe that because the airbox is closed and even with no airfilter, there is only so much air it can get from that dinky 1.5" snorkel.
Put it this way if he just left in the old Mikuni jet he would be 4 points richer than Dynojets richest jet in their stage 1 kit. It probably would have worked better at least until the upper mid-range when it starves out. Don't get that kit!!! Or if you do get them to swap the jets for 104 106 and 108's to start. I firmly believe they can work well, but they need a hell of alot of tweaking. Even a 1.5" airbox mod and a Dynojet kit could probably work well it just would need bigger mainjets.
To be honest the engine doesn't give a shit how it gets the fuel it just burns well at certain conditions. If you stuck a Bing carburetor from WWII and it delivered the fuel properly it would work just as well as a kit. We are just going with what has the highest success and power rate with the least amount of work and Dynojet isn't it.
