What is the squeaky noise on my 2009 honda rebel CMX 250 when I start the first time (it then goes away). What could this be?

I have a Honda Rebel CMX 250 and it makes a weird horn / belt slipping like noice only in the morning when the first try to start the engine. What could this be?

I would bet its your starter.

Any clue WHERE that squeaky noise is coming from?
Not enough nuts feeding the squirrel-belt?

You have ears, let us know. Use a wooden dowel or a long screwdriver to help pinpoint an area. (one ear on the dowel with the other end on the bike, not a hard concept.)

It's most likely the belt. Take a look at it. This can be normal that a vehicle does this but if the belt is damaged or not tight enough it could break or come off. Vehicle won't be disabled without the belt however it needs to be either replaced or put back on as soon as possible, very quickly, within a half hour of it breaking or coming off. The vehicle will still run without a belt and drive but keep in mind the belt runs your alternator which runs all of your electrical systems in the car and it runs the fan and water pump that cools the engine. If those things don't work for too long? Dead vehicle. Expensive repairs.

To check the belt tension just push on it with your finger. If you can push it in either direction more than about a half to three-quarters of an inch it's too loose and needs to be tightened.

If it's tight enough and not damaged and the noise annoys you you can get a spray can of belt ease and spray the pulleys. Don't use any other Lube. Some can eat the belt.

Hard to say without actually hearing it.
While it may have to do with the starter, it could just be airflow (cold start, choked).

Dry bearing in starter motor or starter clutch?

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