Author Topic: Cb550k0 rebuild (Read 21610 times)

BomberMann650 · « **Reply #25 on:** August 25, 2016, 07:03:32 PM »

Negative. My 77 box is in service.

Ya may as well hunt for a complete parts motor. Could come in handy.

jonda500 · « **Reply #26 on:** August 25, 2016, 07:32:38 PM »

The older no cotter pins type cylinder head covers don't necessarily always go bad! I have three still good covers all with over 20k miles on them...
John

sweatshirtolympics · « **Reply #27 on:** August 25, 2016, 08:23:38 PM »

yeah I'll have to look into that bomb, thanks man.

Jonda what's the wear like to the rocker arm bearings? I've got decent wear lines, nothing to serious by the look of it.

jonda500 · « **Reply #28 on:** August 25, 2016, 08:35:09 PM »

It doesn't hurt the rocker arm bearing surfaces the symptom is noisy tappets that keep going loose or tight even straight after setting them. The rocker arm shafts don't have bearings- they aren't meant to turn, it's the rockershaft bores in the cover that can wear if the shafts have been rotating - check for any rocker shaft free-play with them in the cover.
John

sweatshirtolympics · « **Reply #29 on:** August 26, 2016, 01:20:16 PM »

Gotcha ok, thanks John. And if one is stuck?

jonda500 · « **Reply #30 on:** August 26, 2016, 05:46:08 PM »

If one is stuck then at least that one wont have been turning! I have never pulled the shafts out (due to using the 'if it ain't broken don't try to fix it' philosophy), but I imagine you could gently tap it out from the other end using a chopstick or similar? (use some penetrating oil first)
John

sweatshirtolympics · « **Reply #31 on:** August 29, 2016, 02:44:09 PM »

Genius idea calj thank you!

Also gentleman excuse my absenteeism work has kept me busy and busted. But I'll be back at it tonight attacking that cylinder. Stand by.

sweatshirtolympics · « **Reply #32 on:** August 29, 2016, 02:47:53 PM »

Also now that I'm thinking about it...

I had read somewhere that a guy on here was running a duel primary chain on his 750?? Adding 50 horses yeah? I think that's how the narrative went. Anyway I'm not into the lower case yet so I wouldn't know how it's set up but is this mod possible for 550s? Or is there not enough room. Thanks guys.

BomberMann650 · « **Reply #33 on:** August 29, 2016, 03:11:38 PM »

Quote from: sweatshirtolympics on August 29, 2016, 02:47:53 PM

Also now that I'm thinking about it...

I had read somewhere that a guy on here was running a duel primary chain on his 750?? Adding 50 horses yeah? I think that's how the narrative went. Anyway I'm not into the lower case yet so I wouldn't know how it's set up but is this mod possible for 550s? Or is there not enough room. Thanks guys.

All things are possible if you're an engineer with a machine shop

BomberMann650 · « **Reply #34 on:** August 29, 2016, 10:57:02 PM »

Quote from: calj737 on August 29, 2016, 08:43:00 PM

Quote from: sweatshirtolympics on August 29, 2016, 02:47:53 PM
Also now that I'm thinking about it...

I had read somewhere that a guy on here was running a duel primary chain on his 750?? Adding 50 horses yeah? I think that's how the narrative went. Anyway I'm not into the lower case yet so I wouldn't know how it's set up but is this mod possible for 550s? Or is there not enough room. Thanks guys.
Doubt it very seriously. Adding a second primary chain would actually create drag, not increase horsepower. His motor might have been hopped up and benefitted from the secondary chain, but it alone won't add HP. Its not viable for the 550 for many reasons.

You want HP increases? Spend about $2k on the head, Wiseco pistons and a megacycle cam with better carbs (CR-26s do nicely). You might see mid 60s BHP. Worth it to you to go from 38-40BHP to 62-64BHP for $4k?

I thought the 550's produced between 40-50 hp stock?

sweatshirtolympics · « **Reply #35 on:** August 30, 2016, 01:20:55 PM »

Gotcha, great info guys, I really appreciate it.

Ok so, cylinders are removed and that pesky rocker arm shaft is removed as well. i ended up using a hex set and a crochet tool thing and just tapped it out. The rocker arm shafts have wear lines. Can anybody comment on the wear limit? That crochet thingy has saved my a** on this build multiple times.. I highly suggest one. Gotta clean these pistons and stuff up then on to other ventures. Also note, the amount of gunk on those pistons. *shakes head*

sweatshirtolympics · « **Reply #36 on:** August 30, 2016, 01:25:07 PM »

sweatshirtolympics · « **Reply #37 on:** August 30, 2016, 01:26:27 PM »

sweatshirtolympics · « **Reply #38 on:** August 30, 2016, 01:56:53 PM »

And here's the piston shafts wear.

BomberMann650 · « **Reply #39 on:** August 30, 2016, 11:25:26 PM »

any chance you measured that sludge?

b52bombardier1 · « **Reply #40 on:** August 31, 2016, 05:01:44 AM »

That's the sludgiest I've ever seen. They must have been running very rich years ago when this bike last ran, or with cheap fuel or the bike was never allowed to run much fully warmed up and hot.

Rick

Sent from my SAMSUNG-SM-N900A using Tapatalk

sweatshirtolympics · « **Reply #41 on:** August 31, 2016, 05:23:12 AM »

I havnt measured the sludge no! I'll post a measurement tonight. But as far as running rich yes I fully agree, the whole motor wreaks of gas. The oil and everything. My apartment smells like a gas station right now. Haha

sweatshirtolympics · « **Reply #42 on:** August 31, 2016, 01:57:14 PM »

So what do you guys think of the wear on the piston and rocker arm shafts? Would you guys replace them if you've come this far in the service? I can't recall the book saying anything about point of wear on the rocker arm shafts and the rocker arm case itself. I remember someone saying to check the case where the shafts sit. I think the book says something about the piston shaft wear but I'll have to go back and reference it.

Thanks gents! I hope you're enjoying the show! Once we get into the lower case and I know the situation there then we'll be moving onto sand blasting and powder coating on various pieces, getting a rolling chassis going then back to motor work. Or who knows really. I'm all over the place here. Cheers!

sweatshirtolympics · « **Reply #43 on:** August 31, 2016, 05:21:27 PM »

Gotcha thanks calj. Now, does that set you're talking about use torx to yield bolts or was that only from the factory in the 70s? Silly concept if you ask me but I suppose you can't really avoid those bolts stretching. But I'll try and rehone first, maybe I'll get lucky. If not, I guess I'll be forced to re-bore. What about the wear on the rocker arm shafts? Would you replace em calj?

sweatshirtolympics · « **Reply #44 on:** September 01, 2016, 09:16:10 PM »

Stellar info thank you!

sweatshirtolympics · « **Reply #45 on:** September 06, 2016, 06:26:20 AM »

Quick update guys sorry I've been away. I'm redoing the room I'm building in, the whole aparment slants into the middle so I went and picked up some supply's to build a proper solid bench. I'll have everything up tonight and will update with pics, then we'll be able to continue work. Thanks again for the crews support, mad respect for the guys who've filled this thread with good info. See yah tonight! Let's get some photos in here of your guys bench or work shop set ups. I wanna see how you guys are repairing and building!

BomberMann650 · « **Reply #46 on:** September 06, 2016, 08:31:22 AM »

Wait? Your apartment slants?! like, beer rolls downhill slant?

sweatshirtolympics · « **Reply #47 on:** September 06, 2016, 08:48:01 AM »

Lol not beer rolling down five flights of steps but it slants enough where if you've had a few it's easy to fall over pahaha

But yes that was my follow up question about leveling. Thank you!

sweatshirtolympics · « **Reply #48 on:** September 06, 2016, 09:01:21 AM »

Also you's twos didn't post your work set up

BomberMann650 · « **Reply #49 on:** September 06, 2016, 09:08:05 AM »

I'm an open space and tools on floor kind of bike fixer.

Any less fancy and I'd practically be a professional in a 3rd world country.

Big clean shiny stylish shops piss me off

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Author Topic: Cb550k0 rebuild (Read 21610 times)