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Author Topic: up to what size can I drill the original cylinders?  (Read 863 times)

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Offline olasek18_18@o2.pl

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up to what size can I drill the original cylinders?
« on: October 04, 2018, 02:13:23 AM »
I have K6 version, Can I insert 65mm pistons for oryginal cylinder ?
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Offline MessnerMoto

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Re: up to what size can I drill the original cylinders?
« Reply #1 on: October 04, 2018, 03:00:59 AM »
yep thats ok ... and I think also 65.5mm is also ok
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Offline PeWe

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Re: up to what size can I drill the original cylinders?
« Reply #2 on: October 04, 2018, 03:12:27 AM »
I have an old K6 block that has successfully used 836cc (65mm). Bore -piston clearance has excceeded the healthy tolerances so time for next step. New pistons 65.5 mm (CycleX).
The sleeves will be a little bit thinner.

There are also a cheap 836 setup for those that run stock engine, Cruzinimage 65mm kit for $130US (+shipping + VAT+ customs)
https://www.ebay.com/itm/69-76-HONDA-CB750K-836cc-65mm-BIGBORE-PISTONS-KIT-W-HEAD-GASKET-10-CB750KBB/163034437087?hash=item25f59c15df:g:1w0AAOSwrBRa7j8W
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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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