Author Topic: Lets build a SOHC for less than a grand  (Read 24576 times)

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #120 on: January 13, 2020, 07:05:47 PM »
As for the speedo drive thing, are you sure that's not an original drive with the prongs folded down? they were flat originally and used the chrome dish to secure them to the hub so it wouldn't fit inside the disc as it was never meant too.

At a closer inspection, you are right Oddjob. I can see a few ruff cut marks on the edge.

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #121 on: January 13, 2020, 11:18:50 PM »
Started on the engine today. These cases have already been to the acid strippers. Had to do a alloy repair on the front mount first.
Then it was remove all the corrosion and chase all the threads. Fill all the threads with bolts and test the threads. The last thing you will want to be doing is taking a crank case apart to do a thread repair. It takes a bit of time but, always worth while as it will be the last bolt that you put in the crank case that will strip the thread.

After a good blow out with the air line , running bottle brushes down every oil way and then a wipe over with thinners. Get the oven up to 50c and heat cases for half an hour, heat up the paint in hot water, help the flow. One light coat and back in the oven for 10 minutes, a medium second coat and back in the oven for another 10 minutes. Then the third heavy coat and in the oven for 30 minutes. Leave in a heated room for 24 to 48 hours and then back in the oven at 200c for a hour and a half.


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« Last Edit: January 13, 2020, 11:23:08 PM by Trigger »

Offline mattsz

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Re: Lets build a SOHC for less than a grand
« Reply #122 on: January 14, 2020, 12:56:02 AM »
Trigger, is that an original period newspaper in the first pic?
« Last Edit: January 14, 2020, 12:58:16 AM by mattsz »

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #123 on: January 14, 2020, 08:10:36 AM »
Trigger, is that an original period newspaper in the first pic?
That will only just have been delivered where he lives  ;) ;D

Nice living out in the wild blue yonder  ;) At least I don't get my workshops and garage flooded  ;D ;D ;D

Offline Laverda Dave

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Re: Lets build a SOHC for less than a grand
« Reply #124 on: January 14, 2020, 10:35:27 AM »
Great thread Trigger, I'm really enjoying this build.  Will you be taking it to Crich?
1976 Honda 400/4
1977 Rickman Honda CR750
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Offline Green1

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Re: Lets build a SOHC for less than a grand
« Reply #125 on: January 14, 2020, 07:39:14 PM »
Trigger, is that an original period newspaper in the first pic?
That will only just have been delivered where he lives  ;) ;D

Nice living out in the wild blue yonder  ;) At least I don't get my workshops and garage flooded  ;D ;D ;D
If mine got flooded the whole of your location would be under about 300ft of water  ;D ;D

Any sign of a biblical flood I'm heading your way Paul. I won't be taking the Guzzi though got a hernia trying to back it into your drive.  ;D
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Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #126 on: January 14, 2020, 09:55:17 PM »
Great thread Trigger, I'm really enjoying this build.  Will you be taking it to Crich?

I don't know what I will be having for dinner tomorrow, never mind what bike I will be riding in 6 months time  ;)

Offline Rozabikes Tim

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Re: Lets build a SOHC for less than a grand
« Reply #127 on: January 14, 2020, 10:54:38 PM »
You can't not bring it Graham. After all the excitement you have created amongst us mere mortals watching your wizardry! :P
One day I'll have the time to restore it, not just talk and dream....

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #128 on: January 18, 2020, 05:17:52 PM »
Crank cases cured and ready for a bottom end build.
I am coming across this problem more and more these days on 350, 400, 500 and 550 starter clutches. The cog being damaged and with this one, the springs and pins stuck. Had to dump this one and find another good one from the stores.

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« Last Edit: January 18, 2020, 05:20:55 PM by Trigger »

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #129 on: January 18, 2020, 05:36:16 PM »
On to the gear box, a little wear on the centre dog, but good to go. Bearings all good and the small pump. Did find a pin that I could not identify as, this is a home made attempt out of a R clip that did not work, found a original replacement.


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« Last Edit: January 18, 2020, 06:42:28 PM by Trigger »

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #130 on: January 18, 2020, 05:42:42 PM »
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As I said before, it is always worth chasing all the threads as I had to repair one thread that would of been another spit of the cases to get to.


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« Last Edit: January 18, 2020, 05:44:13 PM by Trigger »

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #131 on: January 18, 2020, 05:53:49 PM »
I am always reading about kick start going wrong after a re build. This is down to who ever has done the rebuild has not replaced the circlip on the end of the kick shaft with a new one.
The circlip will stretch getting it off and will never go back to its original form so, will fall off and you will find loads of parts in your sump. A picture showing a old one and new.


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« Last Edit: January 18, 2020, 06:43:38 PM by Trigger »

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #132 on: January 18, 2020, 06:04:47 PM »
All the primary rubbers are good as, the PO rebuilt this engine with a shed load of new parts but, used a fecked crank. When replacing these rubbers always use a little red silicone grease to help the component's slide together.                In the picture I have pointed out on the gear change shaft housing that the seal must not be pushed all the way. There is a oil feed that is behind it, block this by pushing the seal too far back and I can guarantee you will have a problem


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Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #133 on: January 18, 2020, 06:18:33 PM »
I blob of bearing guard on the shells and everything is ready to go back together. Primary chain was new from the old engine. Bolts all sorted and ready. Just a double check that all the cogs mesh, all gears select ok and that the bearings are located on the pins.


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« Last Edit: January 18, 2020, 06:20:56 PM by Trigger »

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #134 on: January 18, 2020, 06:29:16 PM »
For many years, I always get asked : how much Honda Bond to use an sealing the crank cases. Even had a email once asking, how many tubes should he use  :o
I have tried to show what amount of Honda bond should be used. It is just a smear and will show up more on the seals than the case mating.


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Cases bolted together, now just waiting for the zinc plater to pull his finger out so, I will have the wheel spacers and engine spacer. Then the engine can go in and the wheels can go on  ;)

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« Last Edit: January 18, 2020, 06:45:53 PM by Trigger »

 

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