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Author Topic: Are these yoshimura pistons  (Read 1330 times)

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Offline Gordo

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Are these yoshimura pistons
« on: February 16, 2018, 03:03:13 pm »
Hi guys are these yosh piston and if so what is the cr likely to be are they worth grabbing. https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F222840734944
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Offline scunny

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Re: Are these yoshimura pistons
« Reply #1 on: February 16, 2018, 03:17:26 pm »
looks like it. Hope you were the winning bidder.
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Offline Stev-o

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Re: Are these yoshimura pistons
« Reply #2 on: February 16, 2018, 03:19:17 pm »
Too bad the barrels had fin damage, good price though...
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Gordo

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Re: Are these yoshimura pistons
« Reply #3 on: February 16, 2018, 03:31:21 pm »
Yep worth a punt at the price. Good buy at the price???
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Offline 754

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Re: Are these yoshimura pistons
« Reply #4 on: February 16, 2018, 04:09:43 pm »
If the clearance is good yeah great deal.,
 A few busted fins won't slow it down,  I run worse.
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Are these yoshimura pistons
« Reply #5 on: February 16, 2018, 06:05:57 pm »
PopY IS Yoshimura
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Offline gschuld

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Re: Are these yoshimura pistons
« Reply #6 on: February 17, 2018, 05:25:08 am »
Sure enough, POP.Y(Pops Yoshimura) is cast into the piston blanks. 

George
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Offline Gordo

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Re: Are these yoshimura pistons
« Reply #7 on: February 17, 2018, 05:31:26 am »
What's going to be my best course of action in sourcing piston rings for these when they arrive? I'm aware of checking the jug bore wear at front to back and side to side at top,middle and bottom. But not so clear on what rings will be required.
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Are these yoshimura pistons
« Reply #8 on: February 17, 2018, 08:21:33 am »
I can't say about those but for the 750 Yoshi 64mm 812 kit I use CB350 Twin rings so I'd speculate there may be a similar solution.
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline Gordo

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Re: Are these yoshimura pistons
« Reply #9 on: February 22, 2018, 01:59:28 am »
Hi guys I have recived the pistons damn they are so light. Could anyone please help id exactly what I have and if possible what tolerance specs are.



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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Are these yoshimura pistons
« Reply #10 on: February 22, 2018, 12:15:46 pm »
My Yoshi catalogue parts list has a 590cc piston kit under it's CB500 listings. "piston 61mm, 590cc" and "piston rings 61mm" - SURPRISE - could they be stock Honda 750 rings?! 1.5mm, 1.5mm, 2.5mm

The actual 500/550 pages are stuck together so I can't get more info.
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline Gordo

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Re: Are these yoshimura pistons
« Reply #11 on: February 22, 2018, 12:28:29 pm »
Quote from: Jerry Rxman Griffin aka MuthaF'er on February 22, 2018, 12:15:46 pm
My Yoshi catalogue parts list has a 590cc piston kit under it's CB500 listings. "piston 61mm, 590cc" and "piston rings 61mm" - SURPRISE - could they be stock Honda 750 rings?! 1.5mm, 1.5mm, 2.5mm

The actual 500/550 pages are stuck together so I can't get more info.
Cheers for the reply yep they measure out at 61mm so they could be 500 pistons. Is the 1.5mm 1.5mm 2.5mm the width of the ring lands on the piston.
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Offline BPellerine

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Re: Are these yoshimura pistons
« Reply #12 on: February 22, 2018, 01:07:58 pm »
thickness of the rings he is talking about,if they are 61mm,stock 750 rings should fit,the displacement would then be 590.bill
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Offline Gordo

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Re: Are these yoshimura pistons
« Reply #13 on: February 22, 2018, 01:18:56 pm »
Got it cheers guys.
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