Why is there a hole in the #1 piston?

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04 Oct 2008 13:13 #240132 by Gman
Why is there a hole in the #1 piston? was created by Gman
640
I have a '75 Z1 motor from a parts bike that I planned to re-ring and use in a project bike. When I pulled the cylinder I found the #1 piston has a hole machined in the side and a corresponding hole in the #1 sleeve. None of the other pistons or sleeves have this hole. Can anyone tell me the purpose of these holes and whether it ok to re-use these parts? Thanks.
1978 KZ1000
1965 Harly Electra Glide
2002 Gold Wing
1974 Z1 900 project
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04 Oct 2008 13:14 #240134 by Gman
Replied by Gman on topic Why is there a hole in the #1 piston?
640
Hole in cylinder.
1978 KZ1000
1965 Harly Electra Glide
2002 Gold Wing
1974 Z1 900 project
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04 Oct 2008 13:28 #240137 by MFolks
Replied by MFolks on topic Why is there a hole in the #1 piston?
Possibly the engine came this way from the factory due to a machining error or an oil control problem. I'd ask at the engine rebuilders as I'd never seen that before.

1. www.aperaceparts.com
2. www.redlinecycle.com
3. www.dynoman.com
4. www.kzzone.com
5. www.fastbygast.com
6. www.partsnmore.com

If the above do not have the answer I do not know where else to look.
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)

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  • mark1122
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04 Oct 2008 14:41 #240144 by mark1122
Replied by mark1122 on topic Why is there a hole in the #1 piston?
I dont have an answer for you. Sorry . Just more questions.
That is a new one for me.
Is the hole in the sleeve below the block ?
Do the rings go down as far as the hole in the sleeve while running?
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

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~ (k) / (z)

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04 Oct 2008 16:34 #240154 by Gman
Replied by Gman on topic Why is there a hole in the #1 piston?
Sorry to bother everyone, I feel like an idiot. After I looked at it closer with my glasses on I see that it goes all the way through the block. Like someone sabotaged the motor by drilling a hole through it from the outside. Pretty much ruined that set of block and pistons. Makes me wonder what else may have been done to the engine. It was on a parts bike I bought as is. So it goes.
1978 KZ1000
1965 Harly Electra Glide
2002 Gold Wing
1974 Z1 900 project

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  • KZQ
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  • Walking Behind the Corn May Not Be All That!
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04 Oct 2008 17:57 #240166 by KZQ
Replied by KZQ on topic Why is there a hole in the #1 piston?
All the way through? Seems like it would have had to go through the connecting rod as well.

KZCSI
www.KZ1300.com
Riders:
1968 BSA 441 Shooting Star, 1970 BSA 650 Lightning, 1974 W3, 1976 KZ900, 1979 KZ750 Twin, 1979 KZ750 Twin Trike, 1981 KZ1300, 1982 KZ1100 Spectre, 2000 Valkyrie, 2009 Yamaha Roadliner S. 1983 GL 1100
Projects:
1985 ZN1300

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04 Oct 2008 19:01 #240177 by PLUMMEN
Replied by PLUMMEN on topic Why is there a hole in the #1 piston?
how big is the hole?drop another sleeve and piston in the block and carry on :(
Still recovering,some days are better than others.

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05 Oct 2008 04:48 #240211 by Gman
Replied by Gman on topic Why is there a hole in the #1 piston?
640
Here's a pic of the offending hole from the outside. Plummen, I'm sure it can be fixed with a new sleeve and piston if I want to go that route. Complete stock 903 jugs and pistons can be had pretty reasonable so I don't it it's worth messing with. I have a 1015 10.25:1 kit I can drop on it so no big deal. I was just leaning towards a motor that runs on reg gas.
1978 KZ1000
1965 Harly Electra Glide
2002 Gold Wing
1974 Z1 900 project
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05 Oct 2008 08:21 #240234 by PLUMMEN
Replied by PLUMMEN on topic Why is there a hole in the #1 piston?
check your pm ;)
Still recovering,some days are better than others.

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05 Oct 2008 09:14 #240242 by fixer5000
Replied by fixer5000 on topic Why is there a hole in the #1 piston?
wow i think thats a first
1978 kz650b pretty much stock
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massachusetts

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  • mark1122
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05 Oct 2008 11:41 #240252 by mark1122
Replied by mark1122 on topic Why is there a hole in the #1 piston?
You can run 10>25:1 pistons on premium pump gas.B)
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

~ ~ ~_@
~ ~ _- \,
~ (k) / (z)

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05 Oct 2008 11:51 #240256 by 2 stroker
Replied by 2 stroker on topic Why is there a hole in the #1 piston?
some ass probably wanted the make sure it stayed a parts bike
1965 suzuki s32 150 twin
1972 yamaha ls2 100 twin
1980 suzuki gs 550 rat cafe project
1981 kawi 550A1 hooligan bike project
1981 kawi kz 750 ltd
1998 yamaha yzinger

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