Author Topic: My '79 CB650 (Read 40935 times)

cb650 · « **Reply #200 on:** January 23, 2010, 12:48:28 PM »

Its a #$%* but I've done it on two of my motors.

Soos · « **Reply #201 on:** January 24, 2010, 11:28:56 AM »

Well, LOTS of progress in little areas lately.

While removing flashing off the juggs, I spotted the '84 cb650 clutch perch I got some time ago, and thought about hooking it up so I can have a choke cable.

It surprisingly went quickly and well for that install.
Had to remove the ninja choke mount, and widen the slot in it to a little over 1/8", then I put one end of the cable in there, and crimped it so it cannot come out, and re-installed it.
Hooked up the cable on the other end, and had to use one of those adjuster nuts for the clutch cable to take up the excess slack, fit it fit OK.

Now I can start my bike with the push of a lever, switch of a key, and hitting the starter button.
Nice and easy!!

I also got my front brake pressure switch to work again.

Took it off, went to my local auto parts store to find a replacement.
The guy sprayed it out with brake cleaner, and tested it.... works fine now!

The missing tach looks funky with the fairing back on now!

l8r

manjisann · « **Reply #202 on:** January 24, 2010, 07:26:00 PM »

Ok, so I must be missing something. What was the purpose of putting the 550 cam into the 650? I know putting a 650 cam into a 550 is a bit of a hop up, but the other way around??

Brandon

Buber · « **Reply #203 on:** January 26, 2010, 12:39:56 AM »

Apparently it's "sharper", has steeper lobes, hence more "aggressive " performance.

manjisann · « **Reply #204 on:** January 27, 2010, 11:45:00 AM »

That was my guess, just hadn't really heard of doing it before.

Brandon

Soos · « **Reply #205 on:** January 27, 2010, 05:24:41 PM »

Quote from: manjisann on January 24, 2010, 07:26:00 PM

Ok, so I must be missing something. What was the purpose of putting the 550 cam into the 650? I know putting a 650 cam into a 550 is a bit of a hop up, but the other way around??

Brandon

SO I can do proper clearance checks on the piston sets I am modifying.
I need the cam for setup purposes for now.

I'm not crazy enough to keep a 550 in there.... OK, it's getting a 550 cam one day again, but it will have a higher than 650 profile.

Soos · « **Reply #206 on:** January 27, 2010, 05:26:12 PM »

Quote from: Buber on January 26, 2010, 12:39:56 AM

Apparently it's "sharper", has steeper lobes, hence more "aggressive " performance.

No, the 550 cam has less lift unfortunately(it's a stock 550 cam).

This seems to be the bike I raid things for and from from time to time, this time it's the cam for my piston projects.

l8r

cb650 · « **Reply #207 on:** January 27, 2010, 05:30:07 PM »

Last time I checked around you could still get a 550 cam that had 1mm more lift than the 650.

Pinhead · « **Reply #208 on:** January 29, 2010, 05:51:31 PM »

Quote from: Soos

I noticed that this 4-2 exhaust system I picked up is drilled on the end of the muffler.
Three 3/8'ish holes in pattern near the baffle rivets.

Sounds good.

I know this was a while ago, but did you replace the 4-2? If you like the sound of the drilled exhaust, you'll LOVE the sound if you remove the rear baffles altogether. Just drill/grind away the rivets and pull the baffle out. It's not all that loud but has a nice deep grumble.

Frankenkit · « **Reply #209 on:** January 29, 2010, 06:33:36 PM »

How do people drill their exhausts to good effect?! One side of my 4-4 was drilled and the bike sounded like #$%*. I mean, really, it just sounded like an oldschool hot air popcorn popper on 'roids back there. poppapoppapoppapoppa. I said "To hell with that noise" and JB welded the holes shut.

Soos · « **Reply #210 on:** January 30, 2010, 11:58:25 AM »

I can tell you the bike is noticeably quieter now with the 550 cam in it.
Hoping I can still keep pace up "the point of the mountain" on I-15 to and from work

And the drilled holes... I dunno about them yet.
Sounds OK in the garage, but on the road is another thing.
I picked this 4-2 up with the other '79(the one going stock) I bought, and I took off the 4-1 that was on my daily rider '79 to save it for my 763cc bike in the works.

The job of removing the casting flashing on the painted parts is nearly done now.
Gotta luv air tools!

I need to remove the carbs in a few days anyway to change jets, and bench synch the carbs.
So my gheto paint job will begin soon.
Should look good in the end.(at 30 ft, or 30mph at least)

l8r

Hush · « **Reply #211 on:** January 31, 2010, 09:42:49 AM »

I see you haven't found that camera yet Soos or is it the wifie won't let you play with her toys?

manjisann · « **Reply #212 on:** January 31, 2010, 05:49:56 PM »

Quote

I see you haven't found that camera yet Soos or is it the wifie won't let you play with her toys?

Nah, she's just afraid soos will "accidently" upload images that were meant for his eyes only

Brandon

Soos · « **Reply #213 on:** February 01, 2010, 04:21:59 PM »

Quote from: Hush on January 31, 2010, 09:42:49 AM

I see you haven't found that camera yet Soos or is it the wifie won't let you play with her toys?

I've been cut off that toy without asking, and then returning it the minute I am done.
(she doesn't do that, no photo/image/movie... at all.

)

I've got a few pics to take soon(gotta get piston project pics as well)!
I've put black textured truck bed liner on the fairing.... the bike is sever shades of black now.

gotta go eat,

l8r

Ecosse · « **Reply #214 on:** February 01, 2010, 05:25:49 PM »

just re-read your thread from the start, mostly outta general interest, and your mention at the beginning of a '85cb650 oil cooler caught my eye.

forgive me if i missed it but i couldn't find any more info about this and wonder if you could elaborate?

i'd ask for pix... but, uh, i know better.

Soos · « **Reply #215 on:** February 02, 2010, 03:57:12 PM »

It's attached to my custom oil adapter.
A tight fit even by my standards.

I could have alleviated the problem by making the oil lines mount to the adapter further from the block...
But the lines needed the least bending where I put the holes, flats, and counter bores for the oil lines.

And Yeah it's a '85 cb650 nighthawk it came from(the DOHC model)
The adapter used by the DOHC for the oil cooler wasn't quite right for using on my SOHC 650(can't remember why though)

And pics will be coming this weekend.

l8r

Soos · « **Reply #216 on:** February 03, 2010, 05:38:04 PM »

Well, went for a ride...

Bot too bad, although it feels gas starved at high rpm's.
I'm thinking the jets I've switched to are too small for the carbs i'm running.
Definitely better drive-ability at low mph in a high gear though.
with the 650 cam about 25 was the lowest MPH 5th gear would ride, but would not accelerate for diddly at that RPM.(at 20 it would stumble)

At 15 in fifth now, I can accelerate and no chugging/hesitation, just nice even acceleration now.
It's fifth at low speed, what can I expect.
Took her on the highway, and she still does 65 nicely.
Thinking this might be OK for now.

l8r

Pinhead · « **Reply #217 on:** February 03, 2010, 09:24:56 PM »

Hmm you're making me wonder about using a 550 cam in my 650 project. Do you know how similar the "50hp" 650 cam is to the 550 stock cam?

Soos · « **Reply #218 on:** February 04, 2010, 04:34:34 PM »

ohhh... pinhead, you make me think a lot lately you know?

lemme check here.

Quote

The measurements I am coming up with are as follows:
550(1974)
1.362 lobe 1.382
1.110 base circle 1.110
0.252 lift 0.272

650(1979std)
1.390 1.403
1.110 1.110
0.280 0.293

So about .5-.75mm difference.
Nothing massive.
But it's noticeable.
I think I will be happier once I either just break down and buy the right jets, or get one of my 750 jet sets to work out.

l8r

cb650 · « **Reply #219 on:** February 04, 2010, 05:00:58 PM »

Volker (sp) on the 650 site posted the 50hp measurements last year I think.

Pinhead · « **Reply #220 on:** February 04, 2010, 08:10:46 PM »

I found the pic of the 50hp camshaft; I think I'll stick with the stock cam for now. If I can convince myself to try swapping cams in the future I may do some testing. That is if I can ever convince myself to quit riding it once I get it put back together!

Hey, Soos, you thinking about trying some of the ST stuff on any of your engines?

Soos · « **Reply #221 on:** February 05, 2010, 03:03:01 PM »

Quote from: Pinhead on February 04, 2010, 08:10:46 PM

Hey, Soos, you thinking about trying some of the ST stuff on any of your engines?

ST stuff?
Whats that?

l8r

Pinhead · « **Reply #222 on:** February 05, 2010, 08:32:08 PM »

Sorry, ST = Surface Turbulence. Everyone's probably waiting for me to put my motor together before they comment on the concept.

Kev · « **Reply #223 on:** April 27, 2010, 09:22:31 PM »

Hey, Soos,

I got an '81 CB650C and I was wondering what year bike your Ninja 600 carbs came from. I've been looking around a few places and I think I may have found a set that may work.

Aside from the carbs and the trimming of the throttle cable, what else did you need to make them work on your '79?

- edit -

Whoops, I found the thread you posted up on the topic!

http://forums.sohc4.net/index.php?topic=40287.0;all

Any updates?

Soos · « **Reply #224 on:** May 16, 2010, 06:09:11 AM »

Yes in fact.

From the short jaunt on Manjisan's bike(with a set of 750 carbs) and then riding my cb650...
The 750 carbs give more of a quick crisp level of acceleration.
The CV ones I am running are smoother.
But they lag behind where the 750 carbs would put you at with the same throttle manipulation.

CV carbs IMO are great commuter/in town grocery getter carbs.
Great for a new rider.

I have (for piston modification setup reasons) swapped my stock 650 cam with a 550 one(with a slotted cam gear though), and my 4-1 exhaust for a 4-2 exhaust(for other reasons), and I think these carbs are suffering for it.
I can't wait until I can get my 650 cam back in this head!!

She idles like a kitten at about 8-900rpm though.

l8r

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Author Topic: My '79 CB650 (Read 40935 times)