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Author Topic: yoshimura 736 pistons  (Read 1676 times)

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Offline dragon79

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yoshimura 736 pistons
« on: October 24, 2009, 01:03:09 PM »
just wondering if anyone out there knows what the compression ratio was for the 736 pistons listed in the old yoshi catologs.  anyone have any pictures of them.
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: yoshimura 736 pistons
« Reply #1 on: October 24, 2009, 06:22:32 PM »
Checked my catalogue but no numbers. Yoshi lists in the catalogue: 826 high compression, 810 high compression, 748 high compression two-ring slipper, and 736 high compression (stock bore). Plus they list in the price list under the heading YHR 750: part number 4010-00 Piston A 61.5mm, 748cc racing slipper and part number 4011-00 Piston B 61.5mm, 748cc racing slipper BUT no 736.

I would say the 748 are probably 10.5:1 and 12.5:1 but again no info on 736

I believe my 810 is 10.5:1 or 10.25:1
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Offline dragon79

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Re: yoshimura 736 pistons
« Reply #2 on: October 26, 2009, 07:43:27 AM »
any thoughts out there about how these pistons would work in a 550 with 650 head?
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Offline Ricky_Racer

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Re: yoshimura 736 pistons
« Reply #3 on: October 26, 2009, 08:13:05 AM »

Jerry, are you running your 810 on pump gas? Did you do anything to lower the CR? Thanks. RR

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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: yoshimura 736 pistons
« Reply #4 on: October 26, 2009, 10:08:11 AM »
Pump gas since I built it late 70's. No problems. Our pump gas premium here in the Rocky Mountain region is 91 octane. Don't need higher octane at higher elevation. It's been at little above sea level to over 14,000 feet. Doesn't like 14,000 feet unless I keep it in 3rd gear at the most and keep the revs up. Runs just a little rich.  ;) I'm running 115 mains which are a tad rich at our home elevation of 6860 feet. Standard Yoshimura compression.
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Offline Ricky_Racer

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Re: yoshimura 736 pistons
« Reply #5 on: October 26, 2009, 02:56:52 PM »

Thanks, Jerry. I've been wondering about a set of Yoshi 812's I have here. Looks like they may just be usable.  :)  RR

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