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Message started by 4carbcorvair on 06/25/08 at 04:53:25

Title: GZ250 exhaust?
Post by 4carbcorvair on 06/25/08 at 04:53:25

250 question. My brother has a GZ250, it has dual exhaust. Anyone know how they do this? Do they have 2 exhaust valves enabling the two pipes? I asked the dealer about it, one of the salesman hadn't even noticed the 250 had two......

Title: Re: GZ250 exhaust?
Post by bill67 on 06/25/08 at 05:01:41

I don't know either but it would have been cool to of had two pipes and mufflers for looks,but that would have cost money.

Title: Re: GZ250 exhaust?
Post by dills84 on 06/25/08 at 05:41:53

i only see 1 pipe on google. maybe he has some sort of aftermarket 1 into 2 header pipe?

Title: Re: GZ250 exhaust?
Post by KwakNut on 06/25/08 at 05:42:01

A lot of jap singles, especially dirt bikes, do this. Same with European dirt bikes like KTMs (now they're a nice dirt bike, but very pricey).

They tend to run a 4-valve cylinder head and out through two headers then a collector about 18 inches later, or some are siamesed into a single just an inch or two out of the head.

Title: Re: GZ250 exhaust?
Post by 4carbcorvair on 06/25/08 at 05:53:52

http://www.suzukicycles.com/images/ProductImages/logo/500/GZ250K8.jpg

http://www.suzukicycles.com/Products/GZ250K8

Title: Re: GZ250 exhaust?
Post by SimonTuffGuy on 06/25/08 at 08:03:16

Those were the bikes that my MSP class used... I thought it looked a little funny too.

Title: Re: GZ250 exhaust?
Post by YonuhAdisi on 06/25/08 at 09:54:55

I went to the stealership a few weeks ago while they had a GZ250 in stock and asked them about the exhaust. They told me it is a single but with twin exhaust. They didn't go into detail.

Title: Re: GZ250 exhaust?
Post by KwakNut on 06/25/08 at 13:43:07

These are a couple of examples of twin header exhausts for single cylinder dirt bikes.

One with clearly separate headers:

http://i43.photobucket.com/albums/e367/5000SE/off-roadexhaust.jpg

One with a 'siamesed' header

http://i43.photobucket.com/albums/e367/5000SE/KTM450exhaust.jpg

Title: Re: GZ250 exhaust?
Post by toddlamp8 on 06/25/08 at 14:48:53

A single exhaust is cheaper and probably lighter too.

Title: Re: GZ250 exhaust?
Post by KwakNut on 06/25/08 at 15:26:21

617A7171797478652D150 wrote:

A single exhaust is cheaper and probably lighter too.

On a 4-valve head the job of bringing the ports together has to be done in a longer exhaust tract, so that would probably cost a little weight in extra cylinder head material.

As for cost, it's always a matter of balancing cost against efficiency/power, and the costlier designs are there to give you better performance.

Life's a compromise I guess.

Title: Re: GZ250 exhaust?
Post by forrest on 06/25/08 at 17:00:30

Doesn't the Honda Rebel also have dual exhaust?

Title: Re: GZ250 exhaust?
Post by YonuhAdisi on 06/25/08 at 17:09:33

Yes and two spark plugs as well. (I used to own one in the late 80s)

Title: Re: GZ250 exhaust?
Post by Charon on 06/25/08 at 17:28:06

That's because the Honda Rebel is a twin, not a single. It's a 360 crank, with both pistons up at the same time. It fires once per revolution.

Suzuki's web site says the GZ250 is a two-valve engine. It doesn't elaborate on why there is a dual exhaust.

Title: Re: GZ250 exhaust?
Post by Sandy Koocanusa on 06/25/08 at 17:40:27

I don't know why there are two either. Like a genius, I grabbed onto them on Kay's bike to see if one was a dummy for looks. Turns out I was the dummy. They were both hotter than he!l. I don't recommend this as an exploratory method on a motorcycle.

Title: Re: GZ250 exhaust?
Post by YonuhAdisi on 06/25/08 at 19:01:23

5D5B5A5845435859370 wrote:

Please take this in the humor in which it is meant.

"Here's your sign."

Title: Re: GZ250 exhaust?
Post by Sandy Koocanusa on 06/25/08 at 19:27:52

ROFL. No foolin'. I should get a big one for that. You live and learn, and then learn again, and again...