Author Topic: ZG 750 - possible downsize ?  (Read 1050 times)

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Offline Kawa-Leon

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ZG 750 - possible downsize ?
« on: June 11, 2014, 04:18:03 am »
Hi ya, I'm a follower for 3 years and don't recall if anyone talked about this before, so here is the question.  Is there any trouble (mechanical, not psychological :) ) if I "turn off" one of the four cylinders? 

When I did my valve adjustment two years ago after bought it from PO, I found the #4 cylinder was spotless clean.  Like the #4 spark plug never fired...  (wouldn't do it without the helpers from COG; thanks again)

Fast forward, since gas price is almost 25% higher than 3 years ago, and I am thinking how to save the global warming crisis - and my pocket.  I wonder if I am going to make any damage to the bike if I unplug one of the spark plug coil......  ;D

Thanks to your inputs in advance ~
KL 

Offline Outback Jon

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Re: ZG 750 - possible downsize ?
« Reply #1 on: June 11, 2014, 07:20:54 am »
You'd have to do more than just unplug a spark plug wire if you're looking to save gas.  That cylinder would still be taking gas in through the carb and putting unburned gas into the exhaust, where it will build up until a spark from one of the other cylinders ignites it. 

I don't think you'd save much gas anyway, as the friction loss from the cylinder, and the uneven running of the engine, will probably cause you to need more throttle just to drive the bike. 
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Offline Boomer

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Re: ZG 750 - possible downsize ?
« Reply #2 on: June 11, 2014, 02:05:25 pm »
It will vibe worse, use more gas, and wear the bore since gas vapor acts as a partial lubricant in the cylinder.
If ya wanna new 750 triple buy a Triumph 675 and get her bored out.
Either that or buy a Kawasaki H2 and scare yerself silly.  :rotflmao:
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Offline SmokinRZ

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Re: ZG 750 - possible downsize ?
« Reply #3 on: June 11, 2014, 02:36:06 pm »

Either that or buy a Kawasaki H2 and scare yerself silly.  :rotflmao:

Didn't the H2 get about 25 mpg going down hill with the wind to your back?  As a kid in elementary school, I remember being in bed at night and hearing those things miles away and knowing exactly what bike that was  :motonoises:.

Offline davida

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Re: ZG 750 - possible downsize ?
« Reply #4 on: June 11, 2014, 02:38:22 pm »
Cadillac V8-6-4 was a bad idea.  So is this.
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Offline Classvino

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Re: ZG 750 - possible downsize ?
« Reply #5 on: June 11, 2014, 02:39:36 pm »

Either that or buy a Kawasaki H2 and scare yerself silly.  :rotflmao:

Didn't the H2 get about 25 mpg going down hill with the wind to your back?  As a kid in elementary school, I remember being in bed at night and hearing those things miles away and knowing exactly what bike that was  :motonoises:.

Yup.  And they had a strong tendency to wobble at anything over about 85mph...   But I'd still like another one...   :motonoises:

Jamie

Offline virtualdev

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Re: ZG 750 - possible downsize ?
« Reply #6 on: June 11, 2014, 05:02:21 pm »
Portland, OR - '86 Concours "Big Bertha" - '13 Vulcan 900 Custom - '72 Lido 14' - COG #10224 - CDA #0421 - C10 Repair log

Offline Sparkie

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Re: ZG 750 - possible downsize ?
« Reply #7 on: June 11, 2014, 05:27:43 pm »
There's an interesting article in the latest MOTORCYCLIST July 14  where this is being done to Suzuki GSX 600's in order to be able to compete in the 450cc class.  The article describes what needs to be done to accomplish this.  Basically removing valves and plugging the guide holes.  I would say it could be done to the C10.  i'm not sure what the mpg gain would be.  You would probably need to lose one carb in the process.  Let us know how it works if you try it.  Mark
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Offline eldouble

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Re: ZG 750 - possible downsize ?
« Reply #8 on: June 11, 2014, 05:38:18 pm »
What about the fact that the cylinders fire in pairs?  Unplug 1 and you will really throw off the balance.

Offline LessPaul

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Re: ZG 750 - possible downsize ?
« Reply #9 on: June 11, 2014, 05:42:15 pm »
Reminds me of a bit from Alice's Restaurant:

"Off the side of the side road there was fifteen foot cliff and at the bottom of the cliff there was another pile of garbage.......and rather than bring that one up we decided to throw ours down."

Just buy a 750.  ;D
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Offline Nosmo

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Re: ZG 750 - possible downsize ?
« Reply #10 on: June 12, 2014, 01:51:34 am »
NO!
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"What could possibly go wrong...click....go wrong...click...go wrong...click...go wrong..."