Author Topic: 550/650 hybrid or 650 big bore HOW TO (Read 110935 times)

billybobobrain · « **Reply #50 on:** February 11, 2009, 11:01:08 PM »

Will the 550/650 trans fit in the case? Well at that point it would probably be better to just buy a 550 motor as it fits the 500 frame. So I just answered my own question. Thanks for the info tho.

paulages · « **Reply #51 on:** February 12, 2009, 11:20:59 AM »

Quote from: billybobobrain on February 11, 2009, 11:01:08 PM

Will the 550/650 trans fit in the case? Well at that point it would probably be better to just buy a 550 motor as it fits the 500 frame. So I just answered my own question. Thanks for the info tho.

you'd have to ask brianj or maybe twotired. i'm unfamiliar with the 500 cases and how the trans parts fit. i guess for this article to be comprehensive, the 500 info should be included.

dragon79 · « **Reply #52 on:** February 14, 2009, 04:56:41 AM »

hows the reliability been?

dr79

paulages · « **Reply #53 on:** February 15, 2009, 08:58:35 PM »

Quote from: dragon79 on February 14, 2009, 04:56:41 AM

hows the reliability been?

dr79

kick starting can be a little bit of a pain when cold and sitting for more than a week, but once it's started it runs great. pods + hot cam + no electric start pretty much explain the cold start conditions.

bill440cars · « **Reply #54 on:** February 15, 2009, 09:25:15 PM »

Hey Paul, bet you can't wait til Spring hits, so yu can really get the ol' 718 out and enjoy!

Now, what would the chances be of you going for the 740ccs, if you happened upon a deal on an 836 kit?
Would you "Go For It"? Or just be satisfied to explore what you've accomplished (not that there's anything wrong with what you've done on this one.

)

paulages · « **Reply #55 on:** February 15, 2009, 10:23:45 PM »

if i found a cheap set of 836 pistons i'd consider it, but if i were going to go for a bit more, i'd likely do a stage 3 porting on another head and get some CR carbs. probably more to gain there than from another 22 ccs...

Soos · « **Reply #56 on:** February 15, 2009, 11:40:48 PM »

Has anyone ever tried out Cycle-X 65.5mm pistons?
In a 650(or 550/650 hybrid) it would give 752cc's

l8r

billybobobrain · « **Reply #57 on:** February 16, 2009, 10:52:13 AM »

Quote from: Soos on February 15, 2009, 11:40:48 PM

Has anyone ever tried out Cycle-X 65.5mm pistons?
In a 650(or 550/650 hybrid) it would give 752cc's

l8r

I just droped them off at ye old machine shop today we will see how they work this spring. They looked good though.

rachet · « **Reply #58 on:** February 16, 2009, 12:29:54 PM »

Came in from the garage (wish I was working on my bike... Instead I'm cleaning it

) for a bite to eat and rediscovered this thread. paulages, you're bike ROCKS! Do you work on bikes for a living? I live just down the road from you (well... in Eugene anyways) and I'm curious what you would charge if I brought you all the parts? I Have a 500 and 550 motor to work with, and technically a 650 (although I need to verify that) motor and would would love a "750-ish" displacement in it.

forgive me for Hi-jacking the thread, but if you offer this as a service I'm sure I'm not the only one interested.

ok... Back to the "Garage of Doom"....

Rachet~

paulages · « **Reply #59 on:** February 16, 2009, 10:23:05 PM »

Quote from: rachet on February 16, 2009, 12:29:54 PM

Came in from the garage (wish I was working on my bike... Instead I'm cleaning it ) for a bite to eat and rediscovered this thread. paulages, you're bike ROCKS! Do you work on bikes for a living? I live just down the road from you (well... in Eugene anyways) and I'm curious what you would charge if I brought you all the parts? I Have a 500 and 550 motor to work with, and technically a 650 (although I need to verify that) motor and would would love a "750-ish" displacement in it.

forgive me for Hi-jacking the thread, but if you offer this as a service I'm sure I'm not the only one interested.

ok... Back to the "Garage of Doom"....

Rachet~

hey rachet-

no, i don't do it for a living, but i do work on and sell bikes to fund my own expensive habits (e.g. the 718 bike...

). i'd love to do another in the 750 range. PM me if you want to talk seriously about it. i have a good set of 650 cases also, and a good bit of parts.

Soos · « **Reply #60 on:** February 17, 2009, 06:01:38 AM »

Quote from: billybobobrain on February 16, 2009, 10:52:13 AM

Quote from: Soos on February 15, 2009, 11:40:48 PM
Has anyone ever tried out Cycle-X 65.5mm pistons?
In a 650(or 550/650 hybrid) it would give 752cc's

l8r

I just droped them off at ye old machine shop today we will see how they work this spring. They looked good though.

Do post when you find out!!!

l8r

billybobobrain · « **Reply #61 on:** February 17, 2009, 10:05:30 AM »

Sorry that was a little misleading, currently I'm trying to get my buddy to do the conversion on his bike. Somehow I got onto 750 mode. The pistons are going into my k2 750. I'll post the results on my build thread.

Glenn Stauffer · « **Reply #62 on:** June 20, 2009, 05:56:43 AM »

To keep this from getting lost in the forums, I've put this article up on the main site. The only edits I made were in formatting.

http://www.sohc4.net/index.php?q=content/cb550cb650-big-bore-instructions

Ecosse · « **Reply #63 on:** June 20, 2009, 07:57:32 AM »

hey thanks glenn. been following this for a while.

kayaker43 · « **Reply #64 on:** June 20, 2009, 09:38:55 AM »

Excellent,.. I wish this was like wikipedia where anyone could add to the content.

billybobobrain · « **Reply #65 on:** June 20, 2009, 10:22:56 AM »

hey soos I think my buddy and I are going to use the 850 cyclex pistons in his 550/650/750 hybrid motor, i'll let you know how it goes. right now he has to find a little more $ for liners and pistons but hes almost there.

paulages · « **Reply #66 on:** June 20, 2009, 03:00:39 PM »

Quote from: billybobobrain on June 20, 2009, 10:22:56 AM

hey soos I think my buddy and I are going to use the 850 cyclex pistons in his 550/650/750 hybrid motor, i'll let you know how it goes. right now he has to find a little more $ for liners and pistons but hes almost there.

That will be one hell of an engine. If I ever have to go larger (or just end up wanting to), I'll likelly use 65 or 66mm pistons. Good luck with the project!

razor02097 · « **Reply #67 on:** June 20, 2009, 07:49:40 PM »

I wish my 650 had kickstart

paulages · « **Reply #68 on:** June 20, 2009, 08:12:47 PM »

Quote from: kayaker43 on June 20, 2009, 09:38:55 AM

Excellent,.. I wish this was like wikipedia where anyone could add to the content.

As author of the article, I can change it to add info if necessary. If you have anything, just PM me.

CrisPDuk · « **Reply #69 on:** June 23, 2009, 05:13:41 PM »

I've read through all the above and still have a couple of questions, can anyone answer the following for me?

A/ I have three shafts from my various engines with different large numbers cast into them, R9, R10 & R11. I don't have the slightest idea how to measure the various lobes $:-\$

B/ Is there enough meat on the factory 650 pistons to allow them to be machined to fit under a 550 head? The reason being I have a very nice ported head from Mr Reick, and would like to use it on top of a 650 crank/barrel combination

Since I've just siezed a rod onto the crank in my 550's original motor, I now have all the time in the world (around work commitments obviously) to play about with it and the 650 I acquired at the end of last year

The bike gets to stay on the road in the meantime because I managed to get hold of a complete stock motor at a good price to throw in her for the interim

kayaker43 · « **Reply #70 on:** June 23, 2009, 06:13:17 PM »

I would believe a stock 650 head will outflow any ported 550 head with stock valve sizes? I havent seen flow numbers but I do have a Yoshimura ported head and by comparison, the 650 head looks much better with larger valves and ports.

Has anyone done a flow bench comparison?

paulages · « **Reply #71 on:** June 24, 2009, 02:14:50 AM »

Quote from: CrisPDuk on June 23, 2009, 05:13:41 PM

I've read through all the above and still have a couple of questions, can anyone answer the following for me?

A/ I have three shafts from my various engines with different large numbers cast into them, R9, R10 & R11. I don't have the slightest idea how to measure the various lobes $:-\$

B/ Is there enough meat on the factory 650 pistons to allow them to be machined to fit under a 550 head? The reason being I have a very nice ported head from Mr Reick, and would like to use it on top of a 650 crank/barrel combination

Since I've just siezed a rod onto the crank in my 550's original motor, I now have all the time in the world (around work commitments obviously) to play about with it and the 650 I acquired at the end of last year

The bike gets to stay on the road in the meantime because I managed to get hold of a complete stock motor at a good price to throw in her for the interim

chris-

several people have PM'ed me about this, so i'll pipe in... i'd have to go back and do some measurements to be absolutely sure, but off the cuff i'd say that you could not make a 650 piston work with a 550 head. the dome of the 650 combustion chamber is dramatically larger, and the pistons reflect this. as is, the 650 piston will not even come close to fitting into the 550 head. maybe you could cut some serious amount of material from the edges of the piston, but you'll still have really high compression ratios, have to open the valve pockets, and likely have to work the combustion chamber portion of the 550 head a lot as well. that said, i'd be willing to bet there's a lot of room to work with the latter. but, long story short: no, you're not going to make the 650 piston work in the 550 head. also, remember: the 650 pistons aren't much larger in diameter, the stroke is just longer on the 650 crank creating most of the extra displacement. if you really want more compression, deck the 550 cylinder surface or use a thinner head gasket.

i'll definitely second what kayaker43 said. the 650 ports are much better than those on the other SOHC4 bikes.

CrisPDuk · « **Reply #72 on:** June 24, 2009, 05:25:58 AM »

OK guys thanks for the answers, even if it isn't what I wanted to hear

What's the score with the camshafts though, do the numbers just signify diferent batches or are they three different grinds?

paulages · « **Reply #73 on:** June 24, 2009, 10:48:35 AM »

Quote from: CrisPDuk on June 24, 2009, 05:25:58 AM

OK guys thanks for the answers, even if it isn't what I wanted to hear

What's the score with the camshafts though, do the numbers just signify diferent batches or are they three different grinds?

if you're stateside, i'd say it's just different batches. in europe there were different profiles, but not here. the stamping the 550 and 650 cams i was playing around with were the same, telling me the number was probably for the blank before it was grinded.

Seeker0131 · « **Reply #74 on:** June 30, 2009, 06:15:34 PM »

Sent a message to you. I would like to take on this project with a set of CB 500 Cases, and would like to know what your thoughts are...I think that I may have an idea or two!

Take It Easy!

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Author Topic: 550/650 hybrid or 650 big bore HOW TO (Read 110935 times)

billybobobrain

billybobobrain

billybobobrain

billybobobrain

Seeker0131