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Author Topic: 836 Ring Gaps  (Read 767 times)

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Offline Phoenix

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836 Ring Gaps
« on: June 12, 2019, 12:56:46 PM »
Hey, is there any consensus on ring gaps for Cruzinimage 836 pistons.  Hoping to rebuild for the LAST time.
Thanks
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Ed Spengeman
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1971 CB750K1 (Stock)
1973 CB350 Twin  (Gone)

Offline MRieck

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Re: 836 Ring Gaps
« Reply #1 on: June 13, 2019, 01:58:28 PM »
.004 inches for every inch of bore is standard.....i.e. 3" bore = .012 gap
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Offline PeWe

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Re: 836 Ring Gaps
« Reply #2 on: June 13, 2019, 09:24:28 PM »
There is an old long thread about these pistons on this forum. Search for that one. I bet the gaps are mentioned there.

Honda stock gaps must work fine too, maybe just a little more.
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline PeWe

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Re: 836 Ring Gaps
« Reply #3 on: June 14, 2019, 03:49:39 AM »
Here:
http://forums.sohc4.net/index.php?topic=89779.msg1703250.msg#1703250

My last K2 build with cruzinimage 61mm pistons had 0.2-0.3mm end gaps.
Rings had sharp edges I removed with grit 240/400 paper. Pistons too. Sharp burrs can scratch bores.

Sharp edges on rings can hook into the piston or oil rail hook into the middle ring that work as a spacer which can cause issues when cylinder is to be wrapped on to the pistons and all rings need to compress completely without problems, if not risk for bent oil rail, broken ring...
« Last Edit: June 14, 2019, 03:58:33 AM by PeWe »
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967
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