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Jbird

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#3
« on: December 19, 2007, 10:40:29 AM »
This is number three in my growing stable. It's a K0 -- 7/70 build date. When I first got it running two of the carbs weren't carbing very good. I took the the carb set off my chopperized K0 and installed them on this bad boy. I'm a little intimidated, actually I'm almost scared to take it for the initial test drive. It sounds really, really healthy. The PO, who never rode it BTW, thought it was pumped up to 900cc. I'm gonna have to figure out a way to measure the volume of one cylinder to calculate it's displacement. My K6 is smooth and quiet with it's 4 into 1 exhaust, this one is just plain scary sounding. I'm kinda glad it's raining, I'll have more time to coffee up some courage. Jbird 8)
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Offline andy750

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Re: #3
« Reply #1 on: December 19, 2007, 12:37:04 PM »
If you need a test pilot to ride that bad boy just let me know  ;) ;D Have fun and let us know how it goes.....Ill be terribly jealous sitting here surrounded by snow  :-[

cheers
Andy
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Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline dusterdude

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Re: #3
« Reply #2 on: December 19, 2007, 01:58:19 PM »
take it to someone that builds race car engines,ask them if they have the rig that you plug into a plug hole and measure cylinder volume with.
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mark
1972 k1 750
1949 fl panhead
1 1/2 gl1100 goldwings
1998 cbr600 f3

Jbird

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Re: #3
« Reply #3 on: December 19, 2007, 05:28:38 PM »
I'm not scared any more, just very respectful. The rain stopped, I let the roads dry for a couple of hours then went for a short spin. This thing screams, gobs and gobs of power. I'm gonna have to check the K6 to make sure it's a 750, maybe I misread and it's only a 350. I'm in love again. Come on sushine. I'm gonna bundle up Christmas morning and chase that red suited sucker and his reindeer posse back to the north pole.

When I was into off road racing VWs they had a gizmo that could measure the volume of one cylinder with the engine assembled. It wasn't super accurate but it caught a few cheaters. Jbird 8)
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Offline JLeather

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Re: #3
« Reply #4 on: December 19, 2007, 05:35:31 PM »
If you knew someone with a boroscope you could look in through the intakes and see how the pistons look.  Aftermarket pistons, especially the ones climbing into the 900's, are obviously different.

Technically, a compression test will also tell you.  I don't know of any of the big bore kits that weren't atleast 10.25:1 CR.  That would be a higher gauge reading than stock pistons.  Won't tell you what size it is, but it will tell you it's over stock...
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Offline oldbiker

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Re: #3
« Reply #5 on: December 20, 2007, 01:46:31 AM »
Take a bucket full of water and a large measuring jar. fill the jar with water and invert it with the mouth just below the surface of the water in the bucket. The water stays in place in the jar. Set the piston of cylinder one to bottom dead centre. Now run a rubber tube from #one spark plug hole to inside the jar. Turn the engine one half a rev, and the air pumped out of the cylinder will be trapped in the jar and you can read off the cc's from the measuring jar. This will give the true displacement of one cylinder. Just multiply by four.
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Offline Soos

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Re: #3
« Reply #6 on: December 20, 2007, 05:59:22 AM »
Quote from: oldbiker on December 20, 2007, 01:46:31 AM
Take a bucket full of water and a large measuring jar. fill the jar with water and invert it with the mouth just below the surface of the water in the bucket. The water stays in place in the jar. Set the piston of cylinder one to bottom dead centre. Now run a rubber tube from #one spark plug hole to inside the jar. Turn the engine one half a rev, and the air pumped out of the cylinder will be trapped in the jar and you can read off the cc's from the measuring jar. This will give the true displacement of one cylinder. Just multiply by four.


I like the ingenuity there.
Nothing i like more than tools i can make myself.

l8r
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-=≡ Soos ≡=-
Just think to yourself what would Alowishus Devander Abercrombie do?
"Brix will be shat by your neighbors." - schwebel
(61mm)652cc 1979 cb650

Jbird

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Re: #3
« Reply #7 on: December 20, 2007, 10:03:12 AM »
Quote from: oldbiker on December 20, 2007, 01:46:31 AM
Take a bucket full of water and a large measuring jar. fill the jar with water and invert it with the mouth just below the surface of the water in the bucket. The water stays in place in the jar. Set the piston of cylinder one to bottom dead centre. Now run a rubber tube from #one spark plug hole to inside the jar. Turn the engine one half a rev, and the air pumped out of the cylinder will be trapped in the jar and you can read off the cc's from the measuring jar. This will give the true displacement of one cylinder. Just multiply by four.


Thanks oldbiker dude. I was about to make a big mess with ATF and the graduated burette I use to cc heads. All I need is the measuring jar, bucket, and hose, we have plenty of water.  Jbird 8)
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