Hi, I just purchased an unknown year 1993 – 1995 Yamaha Kodiak 400 4×4, which at the time of purchase I was told it needed a new carb and muffler. We sprayed a drop of starter fluid into it and it did fire up fine. Once home, we pulled the old mikuni carb and it was definitely toast. Grooves in the input tube where the cable throttle went, hung the throttle, the main jet was corroded beyond belief. I ordered a replacement carb off of e-bay. At the same time, I also ordered a main jet kit (thru many recommendations) from Dyna-Jet to fit 1993 – 1998 models.
We put the brand new carb on with a new in-line fuel filter & throttle cable & spark plug & battery, and it idled only, and when you try to accelerate, it dies. I pulled the carb, put in the new Dyna-jet main jet needle per instructions for my area (less than 5000 elevation) put the clip on the third ring and re-assembled. Once again, it idles only, then dies when you try to accelerate the throttle. I’ve tried the carb with and without the filter & snorkel on, to no avail.
I recall in the past having a Honda with a plugged muffler with the same issue, so I removed the muffler, leaving only the header pipe. Tried to fire it up. The first time it idled, took one attempt at trying to accelerate and then died again. All attempts after = Idle only, then die when trying to accelerate. I’ve adjusted the main jet two full turns out, later 1-3/4 turns out and still the same. New, non-ethanol gas, new carb, new fuel lines, new air filter, new sponge air filter factory cover. With only a header pipe, there are no exhaust obstructions.
I’m at my limit for trying to figure out why it idles only. Typically, they either run or the don’t, but this is baffling. I’ve seen quite a few posts and took the advice on most, including the Dyna-Jet solution, all to no avail. Can anyone offer any productive advice I haven’t tried yet? Thanks in advance, Mark