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Author Topic: 836cc big-bore kit questions?  (Read 4514 times)

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Offline 01Thomas

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836cc big-bore kit questions?
« on: July 20, 2014, 03:47:50 AM »
Hi everyone
I found this 836cc kit on Ebay and the price is pretty reasonable. http://www.ebay.co.uk/itm/69-77-HONDA-CB750K-K1-K2-K3-K4-K5-K6-836cc-BIGBORE-PISTON-KIT-W-HEAD-GASKET-/261401717357?pt=UK_Motorcycle_Parts_13&hash=item3cdcc1aa6d

Does anyone here have any experience with this no-name brand, or with this seller? ( cruzinimage_uk  )
Or can you suggest a better deal/quality somewhere else?

Also, am I correct in thinking that to fit these 65mm pistons one only needs to bore the existing sleeves (no resleeving necessary)?

regards
Thomas
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1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline dusterdude

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Re: 836cc big-bore kit questions?
« Reply #1 on: July 20, 2014, 04:42:29 AM »
My phone doesnt let me see the ad well,so here's my advice.
Im sure they are cast pistons,which means no hard riding as in racing.if the kit has multi piece oil rings,you're good to go.if your bike is a street cruuser and for the money,you should be good to go.good luck


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Offline neevo

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836cc big-bore kit questions?
« Reply #2 on: July 20, 2014, 04:46:19 AM »
The cruzinimage stuff seems to get great feedback, so much so I bought on of their 466 kits for my CB400F. They are made in Japan and damn high quality as far as I could see.

I highly recommend them although do not have any hours on my motor yet, although others have run them for ages without issue.

Here's the kit I bought:







The pistons were very consistent in their sizing when I had the sleeves bored. Not sure on the 750 sleeves but on the 400 the 466 kit is about as large as you can go on the stock sleeves.
« Last Edit: July 20, 2014, 04:48:20 AM by neevo »
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Offline TurboD

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Re: 836cc big-bore kit questions?
« Reply #3 on: July 20, 2014, 04:59:30 AM »
I bought one of the 836 kits on Feebay from cruzinimage last winter and installed it, it appeared to be of good quality, I have no complaints with it. I would buy another, the next time I need one.
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Offline MCRider

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Re: 836cc big-bore kit questions?
« Reply #4 on: July 20, 2014, 06:22:41 AM »
There is at least one iin depth thread on this subject. HondaMan (I think) commented on some flashing from casting that needed to be filed down. Just inspect closely before using.

OVerall acceptable and installed by many here.

And no it does not require resleeving. Just bore the stock sleeves.
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Offline TurboD

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Re: 836cc big-bore kit questions?
« Reply #5 on: July 20, 2014, 07:03:10 AM »
I will say that the Kit I got recently did not need any cleaning of flashing, they were finished good.
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Offline Stev-o

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Re: 836cc big-bore kit questions?
« Reply #6 on: July 20, 2014, 07:08:58 AM »
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Offline MRieck

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Re: 836cc big-bore kit questions?
« Reply #7 on: July 20, 2014, 08:27:25 AM »
The only thing I'll add is the intake valve reliefs are not large enough of 33.5 oversize intake valves. I would check very carefully if using a mild aftermarket cam as well.
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Offline MCRider

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Re: 836cc big-bore kit questions?
« Reply #8 on: July 20, 2014, 09:04:09 AM »
Quote from: Stev-o on July 20, 2014, 07:08:58 AM
More info here....

http://forums.sohc4.net/index.php?topic=112346.0

Wrong thread. The OP has a 750. That thread is for the 550.  There is such a thread for 750s as well, though.
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Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline MCRider

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Re: 836cc big-bore kit questions?
« Reply #9 on: July 20, 2014, 09:04:47 AM »
Quote from: TurboD on July 20, 2014, 07:03:10 AM
I will say that the Kit I got recently did not need any cleaning of flashing, they were finished good.

Good to hear.
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Ride Safe:
Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline Stev-o

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Re: 836cc big-bore kit questions?
« Reply #10 on: July 20, 2014, 06:19:37 PM »
Quote from: MCRider on July 20, 2014, 09:04:09 AM
Quote from: Stev-o on July 20, 2014, 07:08:58 AM
More info here....

http://forums.sohc4.net/index.php?topic=112346.0

Wrong thread. The OP has a 750. That thread is for the 550.  There is such a thread for 750s as well, though.

My bad, here it is....


http://forums.sohc4.net/index.php?topic=89779.0;nowap
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline MCRider

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Re: 836cc big-bore kit questions?
« Reply #11 on: July 20, 2014, 06:43:09 PM »
Quote from: Stev-o on July 20, 2014, 06:19:37 PM
Quote from: MCRider on July 20, 2014, 09:04:09 AM
Quote from: Stev-o on July 20, 2014, 07:08:58 AM
More info here....

http://forums.sohc4.net/index.php?topic=112346.0

Wrong thread. The OP has a 750. That thread is for the 550.  There is such a thread for 750s as well, though.

My bad, here it is....


http://forums.sohc4.net/index.php?topic=89779.0;nowap
Thanks for finding it, I wasn't up to it.
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Ride Safe:
Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline 01Thomas

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Re: 836cc big-bore kit questions?
« Reply #12 on: July 21, 2014, 12:36:00 PM »
Thanks everyone
I had heard about those 836cc kits but couldn't find the thread. Thanks for the info.

cheers
Thomas
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1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline PeWe

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Re: 836cc big-bore kit questions?
« Reply #13 on: July 24, 2014, 02:17:06 PM »
Time for several bikes so all nice stuff kan be purchased, installed and used! :-) 
Cruzinimage pistons for moderate tuning with less CR, not that hot cam, lightly ported head with OEM valves, OEM carbs and OEM 4-4 in an OEM looking bike. Maybe not a bike that should be described and discussed here in the race forum :)
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Offline Don R

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Re: 836cc big-bore kit questions?
« Reply #14 on: July 24, 2014, 06:54:48 PM »
I'd say an 836 with a cam and ported head is hi-performance. Come and ride mine.
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Offline Big Jay

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Re: 836cc big-bore kit questions?
« Reply #15 on: July 26, 2014, 12:02:23 PM »
I believe those pistons are simply ovwersize stocker. So you would not be able to run adaquate cams. You could machine the pockest, but being cast pistons, you don't want to make it too thin under the valve pocket.
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