Author Topic: Cheap 836 kits back on ebay...$110! *Update! (Read 109844 times)

bert96 · « **Reply #325 on:** May 17, 2014, 03:12:36 AM »

I know the cylinder wall thickness is thin after an 836 kit,so i was wondering if it worth all the troubles and $$$ to replace the sleeves? .Cyclex sell thicker sleeves to solve this problem.

Bert

Envoyé de mon XT1034 en utilisant Tapatalk

PeWe · « **Reply #326 on:** May 17, 2014, 04:35:19 AM »

No problem at all with the sleeves. Thicker sleeves if you want 915 kit that brings better rods.....
This eBay 836 kit is not high CR, no additional heat that need an oil cooler.

bjbuchanan · « **Reply #327 on:** May 17, 2014, 11:24:59 PM »

You don't need thicker sleeves. That is why the 836 is so popular. It is the last step before you get radical

Terry in Australia · « **Reply #328 on:** May 17, 2014, 11:35:40 PM »

Well, technically you can go one more step and use CycleX's 849 kit, but that's another .5mm you need to take your sleeves out to, and they're already pretty thin with a 4mm overbore to 836cc. Cheers, Terry.

01Thomas · « **Reply #329 on:** July 21, 2014, 12:37:07 PM »

This is just a quick note so that I can find this thread again in the future.
~T

PeWe · « **Reply #330 on:** August 05, 2014, 05:31:31 AM »

It is very temptating to order this 836 piston kit + some extra head gaskets + extra ring kits + clutch kit(s) early and later versions + cable kits + all other kind of CB750 stuff when its so cheap.
Then buy another CB750 to put the parts in.
I'm going to become a hoarder, right?

I hope they will sell 4-4 early CB750 OEM style for low price....

MiGhost · « **Reply #331 on:** August 17, 2014, 02:22:56 AM »

I am looking at this kit for the possibility of using in a 650 big bore engine. Yes, it will require resleeving.
If anybody could provide the missing specs for the pistons. I would greatly appreciate it.

Dimensions
•Lower piston diameter: 65 mm (2.55 inches)
•Centre of pin hole to crown: mm ( inches) (compression height)
•Piston height: mm ( inches) (overall height)
•Crown height: mm ( inches) (dome height)
•Gudgeon pin hole: 15 mm (0.57 inches)
•Pin diameter: 15 mm (0.57 inches)
•Skirt height @ Pin: mm ( inches) (exposed skirt)
•Crown to top ring groove: mm ( inches)
•Bottom of skirt to bottom ring groove: mm ( inches)

bert96 · « **Reply #332 on:** November 19, 2014, 04:19:01 PM »

I have this kit and i was ready to bore my cylinders but the guy at the machine shop asked me if i wanted the medium grit or the fine grit for honing the cylinders...?

....so, fine or medium grit? is there any other things i should know before i go again to the machine shop?

thanks for your help guys.

Bert

HondaMan · « **Reply #333 on:** November 19, 2014, 06:43:46 PM »

Quote from: bert96 on November 19, 2014, 04:19:01 PM

I have this kit and i was ready to bore my cylinders but the guy at the machine shop asked me if i wanted the medium grit or the fine grit for honing the cylinders...?

....so, fine or medium grit? is there any other things i should know before i go again to the machine shop?

thanks for your help guys.

Bert

Take your rings to him and let him see them. Cast iron rings use different grit from chrome (or moly) rings, etc. The angle of hone is also different, so they say.

bert96 · « **Reply #334 on:** November 20, 2014, 03:20:24 AM »

Which one is the best,220,280 325 grit for our kit?

Bert

bert96 · « **Reply #335 on:** November 20, 2014, 03:10:07 PM »

Can't believe i have no answers...!?!?

There's a lot of guys here that got the same kit as me and nobody can share their expériences?

Come on guys!

Bert

Retro Rocket · « **Reply #336 on:** November 20, 2014, 03:17:45 PM »

Quote from: bert96 on November 20, 2014, 03:10:07 PM

Can't believe i have no answers...!?!?

There's a lot of guys here that got the same kit as me and nobody can share their expériences?

Come on guys!

Bert

It may be your avatar Bert, mesmerizing...

bert96 · « **Reply #337 on:** November 20, 2014, 03:18:34 PM »

TurboD · « **Reply #338 on:** November 20, 2014, 04:14:36 PM »

Tell him 280, I have honed cylinders med to super fine. After a little run time the end result is all the same.

HondaMan · « **Reply #339 on:** November 21, 2014, 07:02:59 PM »

Quote from: bert96 on November 20, 2014, 03:10:07 PM

Can't believe i have no answers...!?!?

There's a lot of guys here that got the same kit as me and nobody can share their expériences?

Come on guys!

Bert

Oh, sorry, I was looking at a zipper...
Actually, I'm on the road, not getting reliable Internet at the motels. I stayed in one that didn't have working service last night.

Don't get too fine with the grit, unless the ring (top ring) is chrome. Then 320 is OK. Otherwise, use 2nn- something. The hatch angle is said to be 'important' when I've talked with ASME engineers before, but I think it is 'important' for them to argue amongst themselves about? No one had given me a definitive answer re: what angle is best at what grit for which ring type? As with most of the ME types I work with, they can answer any question with one or two variables, but having three seems to make them vibrate and lock in place.

They would HATE to try to program the machines they then build...they just make ME do that part.

bert96 · « **Reply #340 on:** November 21, 2014, 07:50:46 PM »

Thanks guys

Garage_guy_chris · « **Reply #341 on:** January 12, 2015, 06:16:16 PM »

It would appear these may be coming back after being off ebay for a while...

http://www.ebay.com/itm/69-77-HONDA-CB750K-836cc-65mm-BIGBORE-PISTONS-KIT-W-HEAD-GASKET-CI-CB750KBB-/141538985630?pt=Motorcycles_Parts_Accessories&hash=item20f461869e&vxp=mtr

Also this thread has been sleeping a while any new reports / reviews on these? people running them? experiences?

I had a chance to weigh and measure a set of them up tonight and i was quite satisfied:
- 4 pistons within 2 grams of each other
- 4 pistons within 0.0002" of each other

Don R · « **Reply #342 on:** January 12, 2015, 07:01:05 PM »

I haven't heard of any failures yet, they've been around a while. I don't have a lot of miles on mine but I have ran it hard.

Nuffsa Fugginnuff · « **Reply #343 on:** January 12, 2015, 07:20:16 PM »

I'm 'in'.

Excellent info guys, especially since that's my intended project bike engine cc. As an aside, been trying to source a donor bike and/or motor here in Oz and abroad. Looking most likely to pick up a motor (and frame) from USA.

koendd · « **Reply #344 on:** January 17, 2015, 11:42:55 AM »

to bad it's not a buy now item...
allready 153 $ now...

Garage_guy_chris · « **Reply #345 on:** January 18, 2015, 08:38:23 PM »

I wouldnt worry i bet the guy is just feeling out the market. he is probably looking to increase his prices a bit, notice the thread tittle is "$110" last kits were $120. the next cheapest kit is the Cycle X 2nd (0.50) and 4th (1.0) Over Piston Kits @ $199.95 or for big bore, Cycle X 849 kit @ $249.95 i bet they come back at $130 or $140 this year

la ca fe · « **Reply #346 on:** January 21, 2015, 11:44:30 AM »

Will this set fit a 78f motor?

PeWe · « **Reply #347 on:** January 21, 2015, 01:01:14 PM »

F2, F3 had higher piston domes, deeper combustion chambers in head. Compression will be lower with this piston kit. I think this is discussed earlier in this thread.

Stev-o · « **Reply #348 on:** January 21, 2015, 03:02:50 PM »

Update....they are $119 now....

http://www.ebay.com/itm/Honda-CB750-750-69-78-836cc-65mm-Big-Bore-Pistons-Kit-10-25-1-compression-ratio/141542941855?_trksid=p2047675.c100011.m1850&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D28796%26meid%3D50d545ca2efa472e9ce5bcdddc3f1cb5%26pid%3D100011%26rk%3D2%26rkt%3D10%26sd%3D141538985630

koendd · « **Reply #349 on:** January 22, 2015, 06:30:39 AM »

not the same seller though? ships from US and different name.
still cheap though

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Author Topic: Cheap 836 kits back on ebay...$110! *Update! (Read 109844 times)