Author Topic: 72 CB350 Build For The Wife (Read 69309 times)

Harsh · « **Reply #50 on:** July 05, 2014, 11:48:10 AM »

I hit them with some fiber discs on my die grinder to get rid of most of the casting marks. I then hand wet sanded them with 600, 1000, and 2000. Then moved onto the buffing wheel. Started with black, red, then green compound. I did have to soak the brake pedal in prep-n-etch to get take care of the rust on the underside.

grcamna2 · « **Reply #51 on:** July 05, 2014, 12:04:06 PM »

OK,so that was a good bit of work to get them that nice

SOHC4 Cafe Racer Fan · « **Reply #52 on:** July 05, 2014, 05:38:30 PM »

The jugs and head look sharp with the polished edges.

Harsh · « **Reply #53 on:** July 09, 2014, 05:02:15 AM »

Dropped the head off at a local machine shop yesterday afternoon with some pictures that had the dimensions laid out on them of what I need done. I really hope they don't screw this up. Below is what it should look like when all finished. This is so I can fit the new cam chain tensioner in place. Should be ready tomorrow. Cost me $50 which I think is a fair price.

grcamna2 · « **Reply #54 on:** July 09, 2014, 07:33:24 AM »

Harsh $50 is an excellent price

Harsh · « **Reply #55 on:** July 22, 2014, 05:27:10 AM »

Well it looks like the build is going to be stalled for a while. I still haven't gotten the head back from the machine shop. The guy that owns the place has been out of town because of his ailing father. Next Tuesday I go in for neck surgery so even if I get the head back in the next couple of days there simply won't be enough time to finish prepping for paint, paint it, and assembly. I was really hoping to have the engine done before I went in for surgery.

Harsh · « **Reply #56 on:** July 25, 2014, 05:53:29 AM »

Thanks Cal I appreciate the offer.

Well wouldn't you know it the machinist finished the head yesterday. I go to pick it up and I instantly knew it wasn't correct. I provided detailed measurements, instructions, and pictures with the measurements yet he still messed it up. He didn't make it long or deep enough. Story of my life. It was 1.5" long and .5" deep. I needed it 1.8" long and 1.5" deep. He got the width of the cut correct.

He is supposed to fix it first thing today. Needless to say he won't be getting any more work from me.

SOHC4 Cafe Racer Fan · « **Reply #57 on:** July 25, 2014, 07:41:19 AM »

Quote from: Harsh on July 25, 2014, 05:53:29 AM

Thanks Cal I appreciate the offer.

Well wouldn't you know it the machinist finished the head yesterday. I go to pick it up and I instantly knew it wasn't correct. I provided detailed measurements, instructions, and pictures with the measurements yet he still messed it up. He didn't make it long or deep enough. Story of my life. It was 1.5" long and .5" deep. I needed it 1.8" long and 1.5" deep. He got the width of the cut correct.

He is supposed to fix it first thing today. Needless to say he won't be getting any more work from me.

Funny comment, but not funny about the machinist screwing up your instructions. On the positive side, at least he didn't remove too MUCH material.

bjbuchanan · « **Reply #58 on:** July 25, 2014, 03:47:13 PM »

Quote from: CB750 Cafe Racer Fan on July 25, 2014, 07:41:19 AM

Quote from: Harsh on July 25, 2014, 05:53:29 AM
Thanks Cal I appreciate the offer.

Well wouldn't you know it the machinist finished the head yesterday. I go to pick it up and I instantly knew it wasn't correct. I provided detailed measurements, instructions, and pictures with the measurements yet he still messed it up. He didn't make it long or deep enough. Story of my life. It was 1.5" long and .5" deep. I needed it 1.8" long and 1.5" deep. He got the width of the cut correct.

He is supposed to fix it first thing today. Needless to say he won't be getting any more work from me.

Funny comment, but not funny about the machinist screwing up your instructions. On the positive side, at least he didn't remove too MUCH material.

That's the first thing I thought, at least he didn't take away any extra

Harsh · « **Reply #59 on:** July 25, 2014, 03:50:26 PM »

I don't disagree, but it is frustrating when a professional can't get things correct when they are clearly communicated.

Toustic · « **Reply #60 on:** July 25, 2014, 04:00:15 PM »

Subb'd

I also wish you prompt recovery from surgery and look forward to seeing what you're gonna do with that little 350.

Best,
Toustic

Trad · « **Reply #61 on:** July 25, 2014, 04:05:32 PM »

Nice work on the fins! Love the attention to detail. Are you leaving the cylinder raw alloy?

Harsh · « **Reply #62 on:** July 26, 2014, 01:39:18 PM »

Quote from: Trad on July 25, 2014, 04:05:32 PM

Nice work on the fins! Love the attention to detail. Are you leaving the cylinder raw alloy?

No. If you look back to post #40 I posted a pic of what I have in store for paint.

Harsh · « **Reply #63 on:** July 30, 2014, 02:37:00 PM »

Had my surgery yesterday. Everything went well. I chose to go with the Mobi-C artificial discs. Now I am supposed to take it easy for the next 42 days I have off from work. That is going to drive me crazy since I can't stand to sit around and do nothing. I had to stay overnight for observation, but was released this afternoon. Other than a very sore throat I don't have a whole lot of pain.

In the pre-op staging area before any drugs were administered. Just being my normal goofy self.

A post-op selfie.

SOHC4 Cafe Racer Fan · « **Reply #64 on:** July 30, 2014, 03:50:05 PM »

It sounds like the surgery was without complications. Recovery sounds like a PITA - 42 days of "rest". Plenty of time to do research, procure parts, blog, etc.

Take it easy and get well. You will still have some riding weather waiting for you on the other end.

Don

Davidov · « **Reply #65 on:** July 30, 2014, 06:40:48 PM »

Quote from: Harsh on June 22, 2014, 02:24:36 PM

When I looked at the right head cover I noticed a little marring to the surface that rides against the cam shaft. It wasn't until I got the cam shaft out that I realized the spacer was on the wrong side. So it was either initially assembled wrong or someone along the way messed up. However, a closer look at the head cover shows that there might have been a spacer there. If you look in the lower right hand corner you can see a chunk of something. I picked at a corner of it and a little piece flaked off. I didn't notice any wear on the cam shaft though.

Here you can see how the left cylinder wasn't firing.

Head looks good. There was lots of clean oil at the top so that is definitely a good sign.

If you didn't already know....
There can be 1 or 2 of those thin "shims" on either side of the camshaft. There's a spec for axial play (side to side, end play) that you check with a feeler gauge.
Those can also get chewed up from oil starvation.

This guy made his rebuild look easy, from HondaTwins.net
http://www.hondatwins.net/forums/48-engine-discussion/17947-sl-350-engine-rebuild.html

Harsh · « **Reply #66 on:** August 04, 2014, 11:28:43 AM »

Feeling better so I thought I would poke around in the garage today. However....

So pissed off right now. I went to pick up the head from the machinist and he completely destroyed it. He went about 1/8" too far out on one side which blew out the wall. He attempted to cover it up using some epoxy, which when you press on it you can feel it move in and out of the hole. It looks like a 2 year old went at it with a dremel. Which amazes me since the first time I went to pick it up everything was nice and smooth, but the dimensions weren't correct. So it looks like I am in the hunt for a new head.

The dark spots are where it blew through the wall and you can see where he didn't clean up the epoxy on the mating surface.

SOHC4 Cafe Racer Fan · « **Reply #67 on:** August 04, 2014, 11:31:53 AM »

Quote from: Harsh on August 04, 2014, 11:28:43 AM

Feeling better so I thought I would poke around in the garage today. However....

So pissed off right now. I went to pick up the head from the machinist and he completely destroyed it. He went about 1/8" too far out on one side which blew out the wall. He attempted to cover it up using some epoxy, which when you press on it you can feel it move in and out of the hole. It looks like a 2 year old went at it with a dremel. Which amazes me since the first time I went to pick it up everything was nice and smooth, but the dimensions weren't correct. So it looks like I am in the hunt for a new head.

The dark spots are where it blew through the wall and you can see where he didn't clean up the epoxy on the mating surface.

Wow, that looks bad. I would hope he will pick up the cost of a clean, new head (at minimum) and not charge you for the botched job.

Harsh · « **Reply #68 on:** August 04, 2014, 11:38:12 AM »

I will be out of pocket for a new head. It was a fight just to not pay him for his "work". He actually believes the epoxy is a good fix and that he did a good job.

Harsh · « **Reply #69 on:** August 04, 2014, 11:47:45 AM »

I never did pick it up. We talked, but it was well beyond something I could fix up. However, I think it is a SL350 engine and in my limited knowledge I don't know if they are the same as the CB heads. I think they are, but I am not sure. I would hate for you to make another trip down here, but it would certainly help me out.

Harsh · « **Reply #70 on:** August 04, 2014, 12:41:30 PM »

I sent Duster an email to see if it is still available. If it is K0 it will work. If it is a K1 or K2 it won't, but there is a guy on the Twins forum that would be willing to trade me a good CB head for a K1/2 head. So we shall see.

dusterdude · « **Reply #71 on:** August 04, 2014, 04:10:30 PM »

Iirc,the sl and cb/cl are the same except the sl is kick only.now to what year it is,i have no idea.is there a way to identify it

Harsh · « **Reply #72 on:** August 04, 2014, 04:14:34 PM »

Based on the pics you sent me yours in K1 or K2. K0's had an electric start. The serial number is the best identifier I know of.

Harsh · « **Reply #73 on:** August 05, 2014, 09:10:43 AM »

Thanks Cal. I am going to try and figure out how to pick up the bike from Duster. The head on it isn't a direct swap, but there is a guy on the Twins forum that lives in Annapolis that is willing to swap the SL head for a CB head. I am also going to get a head from MoMo (Larry) so I can get to work a bit quicker since it will be a little while before I can do any heavy lifting.

Harsh · « **Reply #74 on:** August 06, 2014, 04:12:46 PM »

Figured since I was waiting on my new head to arrive that I would do some cleaning and taping. I started with lots of scrubbing with acetone to remove any grease from the surface. I then moved onto taping the places I don't want paint to get. Tomorrow I will do a final wipe down with acetone and get everything painted.

Prepped and ready.

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Author Topic: 72 CB350 Build For The Wife (Read 69309 times)