![]() I think some village is still searching for you, Raymond J). Over-jetting leads to four stroking (I had some joker comment on one of my youtube videos basically saying that I was an idiot because two strokes can never four stroke. But the point here is that by over-jetting the regular Urban Express, Honda limited it. I can speculate as to why but maybe later. Honda over-jetted the regular Urban when it put in the 85 jet. Now, the previous owner could have replaced that jet. Rumor has it that Honda put a 75 or so main jet in the Iowa model and used an 85 jet in the regular Urban. Honda put a smaller jet in the Iowa edition when compared to the regular Urban Theories I’ve seen on Honda’s limitations on the Iowa edition. Check head gasket, base gasket, exhaust gasket for possible improper sealing Check piston/rings/cylinder for scoring, blow-by, etc. ![]() Change the spark plug with proper plug with proper gap ġ2. ![]() Clean the carburetor (you may have to clean it several times with special attention to idle jet and needle seat) Ĩ. I have bought two REGULAR Urban Expresses and both did about 25-27 mph when I first got them because of lack of maintenance and care.Ī non-exhaustive list of maintenance that should be performed follows:ġ. The biggest limiting factor in the top speed and overall performance of your Iowa Urban or regular Urban is going to be from a lack of maintenance and care. I should repeat what I just said so you get it: Your Urban Express has probably been sitting in some garage (if you are lucky) or out in the elements (if you are not lucky) and has rotted away for several years. The biggest limiting factor in the top speed and overall performance of your bike is going to be from a lack of maintenance and care. Remember you are dealing with a bike that is almost 40 years old. Let’s deal with one more issue before we address the “bigger questions”. Anyhow, let’s get on to the bigger question of what Honda may have done to limit top speed on the Urban Express and what you can do about it. Why did Honda name it the Iowa model when there were other states that also limited top speed on mopeds? I’m not sure. That is not a definitive answer but it is my best educated guess. My research has led me to the conclusion that Honda limited the top speed to 25 mph. For that matter, I’ve seen many guesses at what the limited top speed is for the Iowa Urban Express – probably anywhere from 15mph to 25 mph. I’ve seen many theories on how Honda restricted the Iowa Urban Express to limit its top speed. ![]() Iowa Urban Express doing low 40s with performance exhaust, SHA carb, BX31 belt – click on CC for captions. ![]()
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