Author Topic: Minimalist Vintage Cafe Racer Project - 1978 CB550k  (Read 7053 times)

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Offline Retro Rocket

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Re: Minimalist Vintage Cafe Racer Project - 1978 CB550k
« Reply #50 on: January 08, 2016, 05:26:34 PM »
I've never used heat to remove a gasket but it shouldn't  hurt, if you keep the flame moving, I've always used sharp scrapers, and I use a little WD40 or something similar to help the blade/scraper slide and not grab....
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline MacaveliMC

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Re: Minimalist Vintage Cafe Racer Project - 1978 CB550k
« Reply #51 on: January 08, 2016, 05:28:11 PM »
Hmmmm, I may try it....I got a tiny bit more off with the Permatex scraper, but the rest of it seems so baked on there, I can't get the edge under it at all, and the edge is already mostly destroyed.

Offline Retro Rocket

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Re: Minimalist Vintage Cafe Racer Project - 1978 CB550k
« Reply #52 on: January 08, 2016, 05:35:40 PM »
I have a scraper like the one in the link, its a thin paint type scraper or putty knife, I've had it for about 30 years and I still keep it sharp and use it regularly, Being thin I find its more controllable, use on a shallow angle and don't use too much force, I always use it 2 handed on fiddly jobs like stubborn gaskets... Mine is like the one in this link except I have rounded off the corners a little so its not jagged...

http://www.amazon.com/Great-Neck-125PC-4-Inch-Flexible/dp/B000OC4YUG
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline MacaveliMC

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Re: Minimalist Vintage Cafe Racer Project - 1978 CB550k
« Reply #53 on: January 08, 2016, 05:39:04 PM »
Hmmmm ok, well I think I'll save that as a sort of last resort, I really don't trust myself not to get frustrated and end up pushing too hard.

What about Aircraft stripper? I've seen that stuff instantly eat paint, any idea what it'll do to this gasket?

Offline Retro Rocket

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Re: Minimalist Vintage Cafe Racer Project - 1978 CB550k
« Reply #54 on: January 08, 2016, 05:48:03 PM »
Hmmmm ok, well I think I'll save that as a sort of last resort, I really don't trust myself not to get frustrated and end up pushing too hard.

What about Aircraft stripper? I've seen that stuff instantly eat paint, any idea what it'll do to this gasket?

We don't have, or I haven't seen aircraft stripper in Australia, if it works, try it, you'll still need something to clean the surface with, there's always stubborn bits, try some steel wool, or a scraper.... ;D
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline 754

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Re: Minimalist Vintage Cafe Racer Project - 1978 CB550k
« Reply #55 on: January 08, 2016, 06:01:12 PM »
I have a gasket scraper, t just does not work for what we need. ( I suspect they may work well n cast iron parts.)
When i was shown how to use the razor knife, I knew it was the answer. Sometimes it gets between gasket and case and just effortlessly removedl huge long pieces ..
 Its a more cutting from the side deal than pushing from the top with the Caveman Scraper.
« Last Edit: January 08, 2016, 06:03:33 PM by 754 »
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Offline MacaveliMC

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Re: Minimalist Vintage Cafe Racer Project - 1978 CB550k
« Reply #56 on: July 21, 2017, 09:39:34 AM »
WOOOOOOOOOOOOOOOOOOOW it has been SOOOOO long since I posted this topic  ;D

sorry about the delay guys! But sometimes, life happens...*cough* marriage *cough*...and you gotta put projects on hold for a little bit. Can I get an amen...

ANYway, here's a QUICK update: I started by tearing the bike absolutely to pieces after riding it home, realized it ran like a complete dog turd, tried doing some basic tuning, and with no luck I gave up completely (read:was really lazy). Every piece now sits individually in my basement either on the floor or in a bag, with the exception of the engine which I promptly put on an engine stand and took of the valve cover, head, and block.  Then I tried to start removing gasket off of the block, which is where I became bogged down as you can see from the last posts on this topic, and after I succeeded in getting most/all the gasket off the block, that is where life stepped in and side-lined the entire project...

But I'm BACK baby! And my resolve is stronger than every! I was disheartened with the prospect of removing all the paint off the finned engine pieces, but I obtained a soda blasting gun for Christmas one year, and I finally decided to try it out! and GOOD LORD that thing is awesome! Cleaned up my block SO fast! So now I have a vision forward....involving these current steps:

1. Finish putting the engine back together, and paint it!  I've already cleaned up the block with the soda blaster, but I'm gonna put it on the engine, and put tape over the cylinder openings, then use the soda blaster on the entire engine to clean it up before prepping for paint. I'm going to do the head separately just because of all the openings on it.  Then I'll put the head on, bolt the head and block down, prep for paint, and then paint!

2. The carbs. Thank goodness for Brian Barnes and his how to for cleaning and rebuilding the PD46A carbs....well, mine are PD46C carbs (printed on side), but I'm hoping it's similar enough that I can kinda follow along and do just as good a job.  Carbs will be disassembled, cleaned, and all gaskets will be replaced, plus float bowl screws because...well, last I checked, they're kinda messed up...like, different screws, lengths, not sure what the PO did...plus, I'll be throwing in a larger pilot jet and main because I'll be building the bike with pods and a 4-into-1 exhaust with the baffle removed - MOAR AIR FLOWS! I've literally spent this whole week reading about tuning carbs, my head is gonna explode...

3. The frame! Got lots of tabs I need to cut off that I won't be using. I'm cutting off the rear end of the frame, and putting a frame hoop on.  Need to pick up seat pan first, and adjust for length, but once I do that, I'm sending it to a dealership nearby who will do some quick welds, and send the whole thing off to get powder coated.

4. I figure after I get the engine, carbs, and frame ready, it's basically a slow roll.  I'll take my time either polishing up or painting suspension and wheel parts. rebuilding things like brake caliper, master cylinder, rear brakes, ect. Slowly putting the bike together.  Eventually I'll get to the point where it's time to build the new wiring harness.  Fortunately this is where it gets easy for me, since I'm an electrical engineer  ;D

So that's basically where I'm at!  I do have one question that I've been pondering lately (read: in the last couple hours)....

Does anyone know how the oil pressure switch works electrically? Is it just a normally on switch that the oil pressure triggers to keep off? Then when/if your oil pressure drops to far, the switch triggers back on and turns on your oil warning light? Just curious, not even sure how/if I'll even wire it yet....probably a good idea tho I suppose  ;)

Edit: Forgot about the gas tank! I just stripped all the paint and currently it's sitting with Metal Rescue in it to get rust out.  Shortly I will be prepping it for paint, then painting it.
« Last Edit: July 21, 2017, 10:33:38 AM by MacaveliMC »