Author Topic: CB500 Big Bore Options (Read 15573 times)

redcaesar · « **on:** July 25, 2008, 04:05:27 PM »

Guys any thoughts on pros/cons of these?

1973 CB 500 needs valves and possible rings done. Considering either:

Replace with stock or

$129 555cc Big Bore Kit with pistons rings and gaskets, (no cylinder sleeves/liners)
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=190239566785

$289 605cc Big Bore Kit with pistons rings, gaskets, and cylinder sleeves/liners
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=350059758918

Apparently machining is going to cost $80 each hole not sure if it's still need in the case of the kit with the liners.

Any one do this already?
Are there any other parts that need to be changed?
Are there replacement gaskets available for down the road?
Any thing else I should be thinking of?

Thanks

hymodyne · « **Reply #1 on:** July 25, 2008, 04:37:02 PM »

Quote from: redcaesar on July 25, 2008, 04:05:27 PM

Guys any thoughts on pros/cons of these?

1973 CB 500 needs valves and possible rings done. Considering either:

Replace with stock or

$129 555cc Big Bore Kit with pistons rings and gaskets, (no cylinder sleeves/liners)
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=190239566785

$289 605cc Big Bore Kit with pistons rings, gaskets, and cylinder sleeves/liners
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=350059758918

Apparently machining is going to cost $80 each hole not sure if it's still need in the case of the kit with the liners.you'll still have to get the sleeves on the 605 kit bored and honed

Any one do this already? yesAre there any other parts that need to be changed? Primary drive chain, camchain
Are there replacement gaskets available for down the road?Yes, cometic sells gaskets @$47.00 eachAny thing else I should be thinking of?Don't buy any valves from thailand (don't ask )

hym

Thanks

MCRider · « **Reply #2 on:** July 25, 2008, 05:17:49 PM »

Quote from: hymodyne on July 25, 2008, 04:37:02 PM

Quote from: redcaesar on July 25, 2008, 04:05:27 PM
Guys any thoughts on pros/cons of these?

1973 CB 500 needs valves and possible rings done. Considering either:

Replace with stock or

$129 555cc Big Bore Kit with pistons rings and gaskets, (no cylinder sleeves/liners)
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=190239566785

$289 605cc Big Bore Kit with pistons rings, gaskets, and cylinder sleeves/liners
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=350059758918

Apparently machining is going to cost $80 each hole not sure if it's still need in the case of the kit with the liners.you'll still have to get the sleeves on the 605 kit bored and honed

Any one do this already? yesAre there any other parts that need to be changed? Primary drive chain, camchain
Are there replacement gaskets available for down the road?Yes, cometic sells gaskets @$47.00 eachAny thing else I should be thinking of?Don't buy any valves from thailand (don't ask )

hym

Thanks

The kit with the liners will require More machining, not the same or less. Boring the block to fit the liners, then as hym says bore and hone the new liners (sleeves). Also, with the 750s, one must sometimes bore the crankcases to accept the oversize sleeves. Don't know about the 500s. More questions to be answered.

redcaesar · « **Reply #3 on:** July 25, 2008, 08:40:27 PM »

Thanks for the info Hym... Does the cam and drive chains have to be done in both 555 and 605 and would they be stock replacements?

Ron I'm guessing the cost for machining would be more then with the 605.

Thanks for the info!

hymodyne · « **Reply #4 on:** July 26, 2008, 04:00:02 AM »

BryanJ advised me to replace the chains before the 605 overbore; don't know about the 555 but suspect that it would be advisable then as well.

hym

MCRider · « **Reply #5 on:** July 26, 2008, 05:46:23 AM »

Quote from: redcaesar on July 25, 2008, 08:40:27 PM

Thanks for the info Hym... Does the cam and drive chains have to be done in both 555 and 605 and would they be stock replacements?

Ron I'm guessing the cost for machining would be more then with the 605.

Thanks for the info!

Yup, bigger you go the more it costs, no shortcuts.

bryanj · « **Reply #6 on:** July 26, 2008, 07:03:06 AM »

Primary chain definately and as thats a complete strip cam chain is nupence on top of other costs

TwoTired · « **Reply #7 on:** July 26, 2008, 10:38:50 AM »

nupence

redcaesar · « **Reply #8 on:** July 26, 2008, 01:44:06 PM »

Any idea what HP difference would be between the three options?

I know the stock CB-500 is rated at 48HP@9000RPM. Would the 555 be pretty much the same as the CB-550? I think the CB-550 is rated at 50HP@8000RPM. What would the 605 give me?

redcaesar · « **Reply #9 on:** July 27, 2008, 07:25:27 AM »

Any more thoughts?

chippyfive50 · « **Reply #10 on:** July 27, 2008, 09:55:14 AM »

I was going down this same road, and this board convinced me to start with a 550 motor in my 71 500..
They were right, even unmodified it was worlds better. Much better clutch too.
http://forums.sohc4.net/index.php?topic=27827.0

crazypj · « **Reply #11 on:** July 27, 2008, 10:19:19 AM »

Quote from: redcaesar on July 26, 2008, 01:44:06 PM

Any idea what HP difference would be between the three options?

I know the stock CB-500 is rated at 48HP@9000RPM. Would the 555 be pretty much the same as the CB-550? I think the CB-550 is rated at 50HP@8000RPM. What would the 605 give me?

Thats at the crank so wheel HP is much lower.
most '605' kits are closer to 591 or 595cc though, do you have piston diameters?
550 has better clutch and also a separate oil pump for transmission.
(but no-one seems to know about it except me)
PJ

hymodyne · « **Reply #12 on:** July 27, 2008, 10:30:27 AM »

605 pistons are 60mm across...
hym

crazypj · « **Reply #13 on:** July 27, 2008, 10:42:55 AM »

Quote from: hymodyne on July 27, 2008, 10:30:27 AM

605 pistons are 60mm across...
hym

Unless my math is way off I get the following using 3.14159 for pi and 50.6mm stroke
60mm pistons give 572cc,
61mm pistons give 591.5cc
61.5mm pistons gives 601.2.
I'm using modified CB750 pistons in my 550 as I believe its about the biggest you can go with stock liners.
(actually, I did it in 1979, don't think kits were available then except for the ( in my opinion) overpriced Dresda ones)
PJ

TwoTired · « **Reply #14 on:** July 27, 2008, 10:48:25 AM »

My "605" kit pistons Measure 60.95mm.

crazypj · « **Reply #15 on:** July 27, 2008, 10:59:24 AM »

That will give a 61mm bore then with 0.05mm ( about 0.002")clearance
PJ

paulages · « **Reply #16 on:** July 27, 2008, 11:11:08 AM »

if you're looking for more power, i'd concentrate on the upper end of the equation first- porting and a hotter cam. you'll get a lot more that way than by going larger in displacement. for the price of the kits and machinework to overbore, you could drop a cam in that i'd wager you feel the results of more.

i'll agree with chippy for sure though- start with a 550 engine. the trans was completely redesigned and is much better.

bwaller · « **Reply #17 on:** July 27, 2008, 11:54:40 AM »

"605" is only what the seller calls that kit. As TT mentions the pistons are 61mm (let's round it up) and as crazypj mentions at that bore it actually displaces 592cc (give or take a cc or so among friends!)

redcaesar · « **Reply #18 on:** July 30, 2008, 02:41:32 PM »

Are there different options for the 605 Kits?

hymodyne · « **Reply #19 on:** July 30, 2008, 02:46:52 PM »

Quote from: redcaesar on July 30, 2008, 02:41:32 PM

Are there different options for the 605 Kits?

yeah-

classic cycle sales will let you spend as much money as you want on them, provided you buy a complete kit each time.
Don't break a ring while installing them; when you do, a little bell lights up and a buzzer goes off notifying Hilliard Ohio that they've got another one coming back...

(I don't sound bitter do I??)

hym

crazypj · « **Reply #20 on:** August 01, 2008, 02:26:02 AM »

Anyone done the kit and have a decent set of 500 pistons and liners?
If so, I'll buy them and fit to CB350F I picked up (yes, I know pin sizes are different)
PJ

hymodyne · « **Reply #21 on:** August 01, 2008, 06:49:26 AM »

I've got a set back in Massachusetts, but I won't be there to ship them out for a couple of weeks.

If you can wait that long, you can have piston& sleeves for the of shipping to your zip

I'm trying to get myself and my wife moved down to maryland and need to clean house and shed.

hym

redcaesar · « **Reply #22 on:** August 13, 2008, 05:49:45 AM »

Still trying to work out the details... Anyone know what cam shaft I should get with the 555 Big Bore kit?

http://cgi.ebay.com/ebaymotors/Honda-CB500-Four-BIG-BORE-555cc-Performance-Rebuild-Kit_W0QQitemZ220267598794QQcmdZViewItem?hash=item220267598794&_trkparms=39%3A1|65%3A1|240%3A1318&_trksid=p4506.c0.m245&timeout=1218631909089

redcaesar · « **Reply #23 on:** October 14, 2008, 03:06:08 PM »

Hi everyone just an update... Decided on doing just the 555 kit because I was worried about A. Keeping costs down, and B.Heat and power requiring more work/parts (non stock cam, oil cooler, etc).

Any way the machine working is all done but I've also gotten a set of used original 4 into 4 pipes that I need mounting brackets for. Any one know where I could get these? Looking to get the top end done and replacing the exhaust at the same time so it only has to be re-jetted once.

Thanks,

RedCaesar

roughidlecustoms · « **Reply #24 on:** October 23, 2008, 01:32:36 PM »

so i just installed a 605 kit on my 73 500 four and i broke a ring after a month of searching i discovered alot of info my kit was a classic cycle kit and they happened to find me a couple of sets of rings so i got got that problem fixed. i think the entired thing all said and done cost about 600 bucks so not too bad. there was this company that had there hay day boring these guys out they told me that. the kit that classic cycle sells i cant remember the acually manufacturing company name. well the pistons are heavyier than stock so the best way to go is to have pistons made which runs 600 but you get lighter pistons and updated rings so you can get rplacements. also newer piston rings are thinner so they have less drag which we should all know less weight + less drag =more power. also they told me that the stock cam was they way to go they used to do some cam grinds but the 500 didnt improve much over boring it out. just some food for thought.

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Rebuild of 1973 CB 500

Author Topic: CB500 Big Bore Options (Read 15573 times)

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