Author Topic: new pistons or 836 kit? (Read 5123 times)

wicat · « **on:** October 01, 2010, 10:16:01 PM »

Hey guys im looking at cyclexchange and they have a set of pistons for the 750 motor thats called the cycle x piston kit 1st 0.25 for 199.00 my question is if i do this kit do i need to bore the block out or can i just remove the sleves? I dont want to get into boring the block but new pistons wouldnt be bad for my rebuild. Any helps would be great.

dave500 · « **Reply #1 on:** October 01, 2010, 11:34:36 PM »

if you have a standard bore you will need to have it rebored over size by that .25 amount,that is the sleeves stay in the barrel and they get bored,resleeving gets more expensive,ide bore it if it needs it,if the bores are ok you can go with new standard size(bore)pistons and rings.

Legin · « **Reply #2 on:** October 02, 2010, 09:04:15 AM »

You cant run a piston in plain Aluminium if thats what your suggesting.

MCRider · « **Reply #3 on:** October 02, 2010, 10:08:32 AM »

Right, gotta have the steel sleeve in place. Why fear boring? A 1st over (.25mm) is a baby step and any machine shop that bores cylinders can do it easily and cheaply. Standard stuff. Still uses stock head gasket.

wicat · « **Reply #4 on:** October 02, 2010, 10:47:30 AM »

not really afraid of getting it board but not to many people here that do that kinda work. Im going to look around but where can i get some new pistons standard size if i want to stay stock?

MCRider · « **Reply #5 on:** October 02, 2010, 11:02:48 AM »

Quote from: wicat on October 02, 2010, 10:47:30 AM

not really afraid of getting it board but not to many people here that do that kinda work. Im going to look around but where can i get some new pistons standard size if i want to stay stock?

Where's "here"? You can ship cyliners to CycleX for example and he'll bore them and fit the pistons and gap the rings for reassembly. I've found shipping out is cheaper than driving across town.

As to sources, all the usual suspects: Motogrid, CMSL, CycleX, etc. If truly standard you can hone the cylinders yourself.

Whats wrong with your pistons?

Stev-o · « **Reply #6 on:** October 02, 2010, 11:20:44 AM »

Do the kit:

http://forums.sohc4.net/index.php?topic=77080.0

Jerry Rxman Griffin aka MuthaF'er · « **Reply #7 on:** October 02, 2010, 01:33:03 PM »

I second the kit. You want new pistons, it has them. You need to bore for 1st over AND for 836. What's to think about here?!

wookie · « **Reply #8 on:** October 02, 2010, 07:40:17 PM »

+1 on the kit. 836 is a nice disp. upgrade if machining is in the cards.

Bluegreen · « **Reply #9 on:** October 03, 2010, 12:29:12 AM »

Quote from: Jerry Rxman Griffin on October 02, 2010, 01:33:03 PM

I second the kit. You want new pistons, it has them. You need to bore for 1st over AND for 836. What's to think about here?!

+2

Love it

mick7504 · « **Reply #10 on:** October 03, 2010, 01:02:42 AM »

+3
Way to go.
Jerry's nailed it - there's nothing to think about.

mycb750k6 · « **Reply #11 on:** October 03, 2010, 08:53:41 AM »

I saw that kit on ebay too so emailed them to ask if the case needed to be opened up for them but never heard back. Looks like a great deal. Anyone actually installed them?

754 · « **Reply #12 on:** October 03, 2010, 09:49:38 AM »

Maybe he thought that was not a serious question, or you were messing with him?
......................................................................................
For those who dont know ANYTHING about BORING cylinders;
......................................................................................
The first 4 oversizes, are 40 thousandths at the biggest size, that is 10 -12 thicknesses of a human hair.

An 836cc kit takes out several mm,s that is 3 or 4 times the 40 thou, takes longer ...= more cost

BOTH the ABOVE.. are done with original sleeves, in the cylinder. Sleeves are mostly changed, to go 900cc, or bigger, or if they have become Damaged. Your case generally does not get bored unless you are over 900cc's.

Stay away from shops that want to hone only, BORING, then FINISH HONING, is generally more accurate..= better results. A very round bore properly fitted, will give good results.

.......................................................................................
I aam going to suggest, if you feel the stock peergormance fulfills all your needs & expectations.. go stock oversize.. if not, go big bore..

Jerry Rxman Griffin aka MuthaF'er · « **Reply #13 on:** October 03, 2010, 09:54:10 AM »

Quote from: mycb750k6 on October 03, 2010, 08:53:41 AM

I saw that kit on ebay too so emailed them to ask if the case needed to be opened up for them but never heard back. Looks like a great deal. Anyone actually installed them?

The cases only need to be opened (holes enlarged) when you use some of the larger sleeves. You won't need to resleeve for 836. I'm using a Henry Abe 900 kit that has sleeves that will fit into my stock cases. Most kits over 850 use LA Sleeves which, I believe, require the cases to be opened up (holes enlarged).

mycb750k6 · « **Reply #14 on:** October 03, 2010, 10:02:45 AM »

Thanks for clearing that up. I'm in!!. Although I realize the 110 for the pistons is just the beginning.

Jerry Rxman Griffin aka MuthaF'er · « **Reply #15 on:** October 03, 2010, 10:19:24 AM »

Stock or oversize stock pistons and rings alone might cost you more than those 836 AND the boring. Throw in a cam and springs while you're at it, maybe $600- $700 if you do the work.

What begins to get expensive is when you get THE disease and think, hmmm, cam, valve springs wouldn't be bad (another $350 or so), of course a ported head (more $$$ than cam and 836) then you think that was soooo good that next time you put some serious size pistons in with new sleeves and of course then you gotta do rods, lighten & balance the crank, big expensive valves, titanium retainers, etc. You can easily put $7000 into one of these engines. I know

GammaFlat · « **Reply #16 on:** October 03, 2010, 12:15:08 PM »

Quote from: Jerry Rxman Griffin on October 03, 2010, 10:19:24 AM

Stock or oversize stock pistons and rings alone might cost you more than those 836 AND the boring. Throw in a cam and springs while you're at it, maybe $600- $700 if you do the work.

What begins to get expensive is when you get THE disease and think, hmmm, cam, valve springs wouldn't be bad (another $350 or so), of course a ported head (more $$$ than cam and 836) then you think that was soooo good that next time you put some serious size pistons in with new sleeves and of course then you gotta do rods, lighten & balance the crank, big expensive valves, titanium retainers, etc. You can easily put $7000 into one of these engines. I know

In the boating industry it's called "two-foot-itis". Maybe this is "two-horsepower-itis".

Stev-o · « **Reply #17 on:** October 03, 2010, 02:56:45 PM »

Quote from: mycb750k6 on October 03, 2010, 08:53:41 AM

I saw that kit on ebay too so emailed them to ask if the case needed to be opened up for them but never heard back. Looks like a great deal. Anyone actually installed them?

Terry in Aus just received the kit, liked the look of quality and said they are from Japan.
He has not installed yet.

754 · « **Reply #18 on:** October 03, 2010, 03:02:10 PM »

I hope he mics the pistons,
and How much crown do they have? & valve cutouts ?

Jerry Rxman Griffin aka MuthaF'er · « **Reply #19 on:** October 03, 2010, 07:48:11 PM »

Frank,

Are you a skeptic?

Terry in Australia · « **Reply #20 on:** October 03, 2010, 08:06:14 PM »

Quote from: Jerry Rxman Griffin on October 03, 2010, 07:48:11 PM

Frank,

Are you a skeptic?

No, I think he's a Catholic Jerry!

The 110 pistons look great, they just look like larger OEM Honda flat top pistons, so no huge increase in compression, just more displacement. I'll take a pic of one of the new ones next to an OEM piston tonight when I ride my beautiful Triumph Rocket III home from work.

Frank's right ref the extra work with boring .25mm to 1st OS compared to 4mm out to 836cc, my old repco boring bar is only good for .010" passes, so I could (but I won't) do a set of 1st OS in one pass, but it'd take 16 passes per cylinder to get a stock set of sleeves out to 836cc, which is probably why I haven't installed mine yet..............

754 · « **Reply #21 on:** October 03, 2010, 08:21:46 PM »

!st over should only be 8 thou or so, less if you got wear...

BLUE71TURBO · « **Reply #22 on:** October 04, 2010, 12:13:02 AM »

I take it that the piston kits from japan are " cast aluminum " and not forged. $:-\$

Terry in Australia · « **Reply #23 on:** October 04, 2010, 12:22:08 AM »

Yeah mate, cast, not that there's anything wrong with that? Here are some pics comparing one of them to an OEM Honda piston. One of you guys asked me what the ring thicknesses are (so you can buy just the rings if you have some 836cc pistons and just want new rings for 36 bucks for 4 sets) so they're 0.0585" for the top two, and 0.106" for the oil rings. Cheers, Terry.

dave500 · « **Reply #24 on:** October 04, 2010, 02:24:35 AM »

i always like to study the oil holes on pistons and deburr them if they look like they need it.

News:

Author Topic: new pistons or 836 kit? (Read 5123 times)