I just bought a Shark 200 Watt system for my 2002 Honda Rebel. I'm not running any special electronics on it like dual lights, heated grips, etc. Is it ok to install this on my bike. I'm getting conflicting opinions from my buddies. Can the Rebel handle it?

Assuming it's a push-pull amplifier and only actually draws 200w at envelope peak at full volume, yes, but it might drain your battery if you turn it up too loud.

If it's a less electrically efficient amplifier design, then it might not. Car amplifiers tend to be notoriously inefficient electrically, because when the engine is running, the power is essentially "free".

If I were me, I'd power it up in series with an analog amp meter, play some music through it into the speakers you plan to use, and see where the needle tends to hover under normal usage conditions. If it hovers higher than 3-4 amps, I'd be a little worried.

Edit: It'd probably be safer getting a helmet with speakers in it or some earbuds and just listening privately, at lower power.

The alternator output is 190 watts at 5,000 rpm.

I don't think that you will be happy trying to use a 200 watt sound system.

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John, 1989 NX250 (daily rider), 2009 CRF230L (L'il Red Piglet), 2001 Rebel - sold

Is the system 200 watts RMS or 200 watts max output? And if it 200w max output, then I agree with Leaf, you probably could run the system at a lower volume for a while. But if it's RMS, I wouldn't even bother.
I believe Shark sells 100w systems as well. I believe I saw one on Amazon the other day. That might be a better option in the long run
http://www.amazon.com/Motorcycle-shark-speakers-amplifier-radio/dp/B0018P5L9G/ref=cm_cr_pr_product_top

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1986 Honda Interceptor 1000 V-Four (VF1000f)
1983 Honda Shadow VT500C (sold)
1986 Honda Interceptor 500 V-Four (VF500F)
1993 Honda Nighthawk 250
1984 Honda V65 Magna
1981 Yamaha XS400 Special
1986 Honda Rebel 450 (project)

I bought torx x2 helmet speakers. they velcro into place inside the helmet. very thing. I then use my Itouch or ipod & can play my tunes. the sound quality is awesome. I paid 45.00