Hey guys,

I just purchased a 98 blackbird with less than 15k original miles. It runs like a dream, for the most part but if I try cruising at speeds over 90mph it sputters. (Accelerates smoothly).

I took it in to have it inspected a few days after purchase and had new spark plugs installed, (still had the originals in it), new tires and new break pads. Mechanic said it looked to be in excellent condition and told me it shouldn't sputter anymore. But it does.

Anyone have a similar situation?

I've read that the rectifier needs to be replaced frequently and wondered if maybe that could be responsible.

I've filled up twice with 93 octane gas but wondering if she's fussy about the brand.

Also thought maybe the carbs need a good cleaning and adjustment but I've yet to see a thread with any mention of carb problems.

I appreciate any feedback.

 

15K miles for a 23 year old bike is not much. Mostly sitting. Carburetors don't like to sit because the gas evaporates and and leave a varnish. Over time it restricts or plugs small orifices'. The rectifier charges the battery. Checking the voltage when the engine is running is the easiest way to see if it's working right.

As for the carburetors, unless you're going to clean them yourself, the challenge is finding someone that will do it right.

 

Thanks. That makes sense.