For a trike, the mileage is not too far off. I do a lot of carb work and would definitely suggest a total rebuild. As these 1500s age( and this one is 21 years old now), if they haven't been apart, it's time. The seals, o-rings, hoses and diaphragms deteriorate with time. Almost every 1500 carb rebuild that I've done in the last couple of years (probably 10-12), has also needed new slide diaphragms. Inspect them closely for cracks and pinholes. If your losing vacuum at that point, your performance will suffer greatly. There are also vacuum hoses under the boot that are well known for deteriorating. A complete carb rebuild on a 1500 can run into some serious expense (carb kit and slides alone will run you over $300), so be prepared if you decide to have it done. I only use Randakk carb kits (they're the best on the market), but the slide diaphragms will be a dealer item. This is a very labor intensive job. If you plan on doing this yourself, do your homework!!! You don't want to do this job twice. Ask if your not sure... Good Luck!