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Author Topic: Lets build a SOHC for less than a grand  (Read 25006 times)

Offline Erny

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Re: Lets build a SOHC for less than a grand
« Reply #75 on: December 31, 2019, 06:43:12 PM »
Just to complete my experience from istalling tappered bearing kit on 750 K7 and 550 K1.
in both cases, I used All Balls kit 22-1011, content on the pic, including install instructions

Lower bearing - simply take OEM one, put it next to new tappered one and select proper wasther to have the same height. Don't remember which one I took, but it was exactly the same height finally than OEM.

Upper one - I used only seal and bearing w/o washer. Additionaly I grind off ridges from the spanner nut to ensure it sits flush.
This ensures that nut is turned enough to secure top.

Only outstanding issue is gap (appox 1-2mm) on top of ears - can be easily fixed by O-rings or custom made flat rubber washer or stainless steel washer(s).

note: photo of spanner nut after grinding is not mine (I forgot to take pics..) but looks like mine ;)
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CB750K7 US model (1977)
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Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #76 on: December 31, 2019, 07:55:56 PM »
Yes that is the kit that I fitted. The lower bearing was a good fit but, the issue is the top cup and bearing. Even without the top seal and washer it was still too proud and not enough thread to safely secure the top nut. Even if you ground off the ridges of the spanner nut, that would only give you another quarter to half a turn more on the top nut.

As I have already explained that the only way, would be to mill out the seating area of the head stock about 3mm so that the cup sat lower. I have a old rotted out frame and will cut the head stock off and mill it, then refit this kit to see what results I can get. I will do this at a later date  ;)
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Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #77 on: January 02, 2020, 10:16:53 PM »
Got the tank back today, all filled and prep up ready for paint. Many thanks to the member who did the tank for me  ;) [ Guests cannot view attachments ]


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« Last Edit: January 02, 2020, 10:20:30 PM by Trigger »
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Offline Green1

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Re: Lets build a SOHC for less than a grand
« Reply #78 on: January 02, 2020, 10:28:15 PM »
Graham you must be the only person to have a 250u poster on your wall  ;D
I like the bars There better then the US spec I'v been tempted to buy lower bars for the 550
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Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #79 on: January 02, 2020, 10:35:08 PM »
Quote from: Green1 on January 02, 2020, 10:28:15 PM
Graham you must be the only person to have a 250u poster on your wall  ;D
I like the bars There better then the US spec I'v been tempted to buy lower bars for the 550

So, you didn't spot the CD250 new exhaust hanging beside it  ;D
Will have to change the bars as those ones are a little low for a 550F tank and the throttle cable hits the tank on full lock. Need about another inch raise  ;)
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Offline Green1

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Re: Lets build a SOHC for less than a grand
« Reply #80 on: January 02, 2020, 10:41:44 PM »
I don;t know how I missed that. Good find its easier to find sandcast parts.
I wouldn't have noticed the cables hitting the tank as that would be acceptable on an Italian bike.
The switch gear and the top yoke hit the guzzi tank  ???
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Current bikes
Honda CB750k1 Valley Green Metallic
Honda CB750k1 Candy Gold
Honda CB550k Candy Jade Green
Honda CG125
Aprilia Pegaso 650
Moto guzzi 1200 sport
Kawasaki EX650R (Mine until dave pays for it)
Kawasaki ZXR400 J

Offline Erny

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Re: Lets build a SOHC for less than a grand
« Reply #81 on: January 02, 2020, 10:42:50 PM »
Trig, what bars are those? From DSS? What exact part no?
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Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #82 on: January 02, 2020, 11:03:49 PM »
Quote from: Erny on January 02, 2020, 10:42:50 PM
Trig, what bars are those? From DSS? What exact part no?

I don't know, just a aftermarket set with no holes that a member donated to me.
Have a load of old Honda low bars and will find another set that are more suitable .
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Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #83 on: January 05, 2020, 06:53:14 PM »
Was doing some paint work on a CB750K2 that I am putting together so, did the disc's for this project. A lot of masking and two coats of satin caliper paint.
Hubs were powder coated when the frame was done. Not for the purist  ::) But a lot easier to keep clean  ;)
Will get the wheels together this week with, new bearings NTN 6304 and 6305 for the rear and SKF 6302's for the front. Have a new set of DID rims and have a set of stainless steel spokes from a customers set of rims who wanted to go back to original spokes  :o


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Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #84 on: January 07, 2020, 11:08:30 PM »
Got the speedo drive in the post for a twin disc.

Went to fit a engine for a member yesterday and he had a spare 500 four main loom. In good condition, just a corroded spade needed replacing and the main earth feed wire. This will do the job for this build.

Tank and panels are on there way to Ireland. Another member is going to sort the paint and clear coat.


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« Last Edit: January 07, 2020, 11:10:35 PM by Trigger »
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Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #85 on: January 08, 2020, 07:00:10 AM »
Quote from: Oddjob on January 08, 2020, 02:49:06 AM
Speedo drive looks well made Graham, can you say where you got it, made my own back in the day but if ones available that's better I might replace it as I'm doing the resto.

If you read back through the thread, the pictures and supplier is there. You do need the cut away hub for this to work  ;)
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Online Bryanj

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Re: Lets build a SOHC for less than a grand
« Reply #86 on: January 08, 2020, 08:10:31 AM »
I missed those pics mate, you are using a later hub if it was an early one they have the two flats machined on them for the downward facing tangs on the drive on left in your pic the fit to.
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Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #87 on: January 08, 2020, 08:25:53 AM »
Quote from: Bryanj on January 08, 2020, 08:10:31 AM
I missed those pics mate, you are using a later hub if it was an early one they have the two flats machined on them for the downward facing tangs on the drive on left in your pic the fit to.

Strange, I can see them on page 2 >>> www.sohc.co.uk/index.php/topic,20419.15.html
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Online Bryanj

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Re: Lets build a SOHC for less than a grand
« Reply #88 on: January 08, 2020, 01:50:41 PM »
Yup just me being dumb, must have skipped a page by mistake mate
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Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #89 on: January 08, 2020, 05:26:38 PM »
Quote from: Bryanj on January 08, 2020, 01:50:41 PM
Yup just me being dumb, must have skipped a page by mistake mate

Your not the only one mate, oddjob also missed it out and I thought he would of picked up on the Cibie headlight  ;D ;D ;D
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