Author Topic: 72 CB350 Build For The Wife (Read 68481 times)

SOHC4 Cafe Racer Fan · « **Reply #75 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 #76 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.

calj737 · « **Reply #77 on:** August 04, 2014, 11:42:12 AM »

Harsh - did you ever get the other bike/motor from Duster? If not, let me know. If it's an option, I can drag that down to you, then bring the head up here to a competent shop for you.

Say the word-

Harsh · « **Reply #78 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.

calj737 · « **Reply #79 on:** August 04, 2014, 11:51:53 AM »

Let me know if I can help, in any way.

Harsh · « **Reply #80 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.

calj737 · « **Reply #81 on:** August 04, 2014, 12:44:36 PM »

Definitely let me get huge machining done on my end this time.

dusterdude · « **Reply #82 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 #83 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.

calj737 · « **Reply #84 on:** August 05, 2014, 07:46:28 AM »

Here you go, Sailor

http://forums.sohc4.net/index.php?topic=140022.msg1544512;topicseen#new

Harsh · « **Reply #85 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.

calj737 · « **Reply #86 on:** August 05, 2014, 11:15:44 AM »

gotcha-

Harsh · « **Reply #87 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.

calj737 · « **Reply #88 on:** August 06, 2014, 05:11:23 PM »

For super clean results, might have been good to also pre-heat those parts (except the starter) in the oven on 250 for about 30-45 minutes. Helps drive out impurities in the alloy.

Harsh · « **Reply #89 on:** August 07, 2014, 11:19:19 AM »

Got everything sans head painted. I forgot how much a pain in the arse doing the fins is. It is just tedious work. I don't have access to the powder coat oven I used when I baked the 750 engine and the wife won't let me use hers so the paint will just have to fully cure by use. I used VHT paint. The black is the GM satin and the silver is there universal aluminum. I can now start to assemble the engine.

I have to do a little bit of sanding to the 325cc to remove some of the black paint I couldn't wipe off.

calj737 · « **Reply #90 on:** August 07, 2014, 11:46:17 AM »

Even with a crooked neck, you still do beautiful work, Harsh!

dusterdude · « **Reply #91 on:** August 07, 2014, 02:00:53 PM »

It do look good

Stev-o · « **Reply #92 on:** August 07, 2014, 07:14:28 PM »

Quote from: dusterdude on August 07, 2014, 02:00:53 PM

It do look good

+1, nice lookin motor.

Harsh · « **Reply #93 on:** August 08, 2014, 02:53:51 PM »

I basically assembled the engine today. It was a pain going through all of the seals noting which one went where. While I was at it I decided to label all of the o-rings and remaining seals to make things a bit easier later on. The memory card I was using to store the photos of the tear down some how became corrupt so I had to go from memory, a blury copy of the shop manual, and pics gleamed form the interwebs. It proved to be a little bit of a pain in the arse to say the least. Hopefully I will have the engine completely assembled (minus the head which is on its way) tomorrow.

Harsh · « **Reply #94 on:** August 09, 2014, 05:11:03 PM »

Didn't get nearly as much done today as I had planned. I was really only able to get the starboard side done. The loss of the pics I took of the tear down really took its toll. There were a number of little things that the manual just doesn't make note of so I had to do a lot of searching online to try and find the answer. When I went to start the port side I couldn't get the chain that attaches the starter to the crank on. I ended up having to remove the rear wheel from the bike so I could use the axle to thread into the generator so I could remove it. That allowed me to pull the gear off the crank so I could get the chain on.

I was able to hone the cylinders, put new rings on the pistons, and get the jugs installed.

The red stuff on the gears is Redline assembly lube. Since I won't be starting the engine for a while I wanted to make sure things had a nice coating of lubricant so that everything is good to go until oil can make its way through the engine and lubricate everything as required. I used it on the trans gears and any moving parts on the inside except the cylinder walls.

Harsh · « **Reply #95 on:** August 11, 2014, 02:29:00 PM »

The new head arrived today. I spent some time scrubbing it down to get rid of the vast majority of the grit and grime. Pretty excited to keep moving forward with the build.

MoMo · « **Reply #96 on:** August 11, 2014, 02:50:54 PM »

Quote from: Harsh on August 11, 2014, 02:29:00 PM

The new head arrived today. I spent some time scrubbing it down to get rid of the vast majority of the grit and grime. Pretty excited to keep moving forward with the build.

sorry for all the crud

I realized I forgot to include the springs, valves were bent from the broken cam chain. Need the springs and keepers?

Harsh · « **Reply #97 on:** August 11, 2014, 03:05:25 PM »

Oh don't be. It was actually A LOT cleaner than the original head. I probably only spent about 30 minutes scrubbing it. No need for the springs or keepers since I am going to use the set I already have.

MoMo · « **Reply #98 on:** August 11, 2014, 03:21:36 PM »

good start!

SOHC4 Cafe Racer Fan · « **Reply #99 on:** August 11, 2014, 03:49:43 PM »

Let's all hope the milling goes off without a hitch this time!!

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Author Topic: 72 CB350 Build For The Wife (Read 68481 times)