In this video I identify the issue with the Vstar, or Star 650 cruiser and the known issue with ethanol that causes the engine to stutter and die directly off idle. Even if the Mikuni carbs are perfectly clean, it doesn't cause much sitting to produce this problem. We evaluate, and then remove the tank to prepare for the task. The fact is, there is little to be done to prevent this. I have tested these jets out of the bike, and with 10E gas, over time the specific jets in question will slowly continue to shrink and worsen. Experiments were done with up to 50/50 sea foam and gas mixtures but this is not really effective. Of course you can use something more reactive, say, Carb or brake cleaner, but that brings us to this video.

Now, i'm one of those folks who says, if the carb is dirty, you take it out, strip it, clean it, inspect it and reassemble it. The right way, no shortcuts!!! But I make a rare exception here. Too often Ive seen this particular setup where the carbs were superb! You could eat of of them, simply this single point of failure causing the issue time and again. As luck would have it, the bike is set up, if by design to mitigate this problem to an extent. Without having to tear up the whole bike. Just raising the tank a bit for room.

Truly, one should surmise that if after the first video and into the second removing the bowl covers reveals a horror show, then , well, this series may not be for you. This might require comprehensive work. Thats not what this series is about. It is the quickest way to resolve a known issue in the 650 carbs due to ethanol gas.

Also, a viewer points out that, I did not mention my penchant for hex screws. I get them at Ace hardware and often use them to replace the crappy pot metal Phillips screws you find in the Mikuni carbs. I do so at the first opportunity.


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