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Author Topic: 1982 CB750F... The resto-not  (Read 33485 times)

Offline Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #180 on: Jan 03, 2019, 10:19:46 »
Yeah, I was afraid you may say that!  There are a few spots where the paint job is pretty rough so I may attack those with stripper, but thankfully they're in fairly easily reached areas.  The thought of stripping off all the paint though, that sounds like a nightmare.  I'll get the worst off, and chalk the rest up to experience...
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline doc_rot

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Re: 1982 CB750F... The resto-not
« Reply #181 on: Jan 03, 2019, 18:51:55 »
i had to deal with a spray bomb once. Get some expanding rubber plugs in the intake and exhaust ports, refit all your engine cases and go nuts with the stripper. make sure you wear safety glasses when you are using it with a brush cuz it can flick it into your eyes. Ask me how i know....

Offline Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #182 on: Jan 03, 2019, 19:05:34 »
I found that out the hard way already Doc.  No running water in my garage (or near it)...covered in the stuff I had to make a mad dash outside and bury my arm in the snow up to my shoulder.  Every time I think about it it reminds me of the scene in Raiders of the Lost Ark, when the nazi bugger picks up the red hot medallion and makes a beeline for a snowbank.  My yelps were just as lame as his.
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #183 on: Jan 07, 2019, 19:13:54 »
Not a million miles off painting this thing now.  Found a rather sculptural position with a fairly solid balance point -



- and wondering if that may be a good position to paint it?  I'll probably pull the oil pan off first though and this will probably upset the balance.  If anyone reading has painted one of these lumps before (assembled) and has any pointers re. positions for engine let me know?  I'm thinking two positions - one to get the underside and then roly-poly it to get the rest. 

Is primer the way to go?  This engine has been painted before but without primer.

In other news, I'm going to have to modify the frame brace a little here -




I'm using a K tank on this F frame and so the mounting position is different.  It also doesn't sit flush with the seat frame rails on the horizontal, so in order for it to not get in the way of the seat pan it'll need to be lowered.  However the battery cage also mounts to this so I'll need to be careful with the grinder.  Plan is to cut some slits out and lower it, then re-weld.  In my head it makes sense.



"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline Maritime

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Re: 1982 CB750F... The resto-not
« Reply #184 on: Jan 07, 2019, 19:53:00 »
Clean it  really good and prep it right and you dont need primer but you do need to heat cure either in an oven or by running the engine with duplicolor or vht engine paints. Oh and I should get over this week to get the carb kits and put them on the bus to you.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline Jimbonaut

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Re: 1982 CB750F... The resto-not
« Reply #185 on: Jan 07, 2019, 20:46:37 »
Legend, cheers Mike - carbs are next-ish on the list so that'll be good timing.  No primer?  Sounds good to me.  The selection of VHT paints at Canadian Tire seems to have slimmed down a bit so may end up with a Duplicolor engine enamel instead.  Looks like they're much of a muchness.

When you say prep it right - so far I've de-greased the bejeezus out of it, cleaned it up with S100 and a load of brake cleaner and keyed up the remaining paint/aluminium cases so the paint sticks good and proper.  I still need to wipe the thing down with thinners - is that pretty much it?

Also, will have to cure the paint by running the engine once it's back in the bike - no oven here. 
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline Maritime

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Re: 1982 CB750F... The resto-not
« Reply #186 on: Jan 07, 2019, 23:20:51 »
Yep pretty much that, getting as much oil residue off as possible makes the most difference. I like a wash in full strength simple green, then a good rinse with water as well. Plug the holes.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline advCo

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Re: 1982 CB750F... The resto-not
« Reply #187 on: Jan 08, 2019, 09:11:57 »
I've always scuffed with 320 grit or similar. And used primer. But since this already has paint on it you'll probably be ok without.

Offline Maritime

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Re: 1982 CB750F... The resto-not
« Reply #188 on: Jan 08, 2019, 09:32:01 »
I've always scuffed with 320 grit or similar. And used primer. But since this already has paint on it you'll probably be ok without.

I follow the can, I know some don't need primer and some do depending on brand and possibly colour you use.  That being said I always have baked my covers in the oven and then cured the cases with engine heat per cans. I just use a toaster oven in the garage for the covers. I got one cheap at a thift store that can fit a 12" pizza and so can take most engine covers.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline advCo

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Re: 1982 CB750F... The resto-not
« Reply #189 on: Jan 08, 2019, 09:43:40 »
I follow the can, I know some don't need primer and some do depending on brand and possibly colour you use.  That being said I always have baked my covers in the oven and then cured the cases with engine heat per cans. I just use a toaster oven in the garage for the covers. I got one cheap at a thift store that can fit a 12" pizza and so can take most engine covers.

True. When I did the 360 I cured all the pieces individually in a ghetto oven with a heat gun. On the 350, I painted it completely assembled on an engine stand, and didn't cure it until I had the bike running, which was a few months later. I believe I used Duplicolor on the 350, and it was gas and oil resistant even before I ran it in to cure the paint. I did the same on the RV125.