Author Topic: Lets build a SOHC for less than a grand  (Read 24564 times)

Offline Erny

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Re: Lets build a SOHC for less than a grand
« Reply #45 on: November 11, 2019, 12:26:55 PM »
Thanks a lot, now it is clear!
Another item I'll address during looong winter

Any particular grease you would recommend?
Looks mine is turning rather difficult, I suspect grease degraded or too thick
CB750K7 US model (1977)
CB550K1 US model (1975)

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #46 on: November 12, 2019, 09:13:49 AM »
Any new grease is better than old grease  :o
I just use some high temp stuff that is green and comes from Lucas  ;)

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #47 on: December 15, 2019, 07:13:45 PM »
Not much happening with this build, still waiting on all the frame and metal to be painted. Have the crank cases back from the strippers. Just have to remove the old corrosion that was under the old paint and lacquer and it will be ready to have all the threads chased and paint.

Will have to kick the painter soon as, I will soon have the bottom end ready and will put the bottom end in the frame and build up the top end.


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« Last Edit: December 15, 2019, 07:16:48 PM by Trigger »

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #48 on: December 21, 2019, 01:16:23 PM »
I think I pulled the short straw with the deal on the powder coating. Ended up peening for him nearly all day but, at least all the metal parts are coated.




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« Last Edit: December 21, 2019, 01:18:35 PM by Trigger »

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #49 on: December 21, 2019, 01:25:08 PM »
When you are doing this prep work, you always forget something and this time it was to mask up the top shock mount threads. It came out OK, even starting with a old rusty frame.

Also did a few other bits and I have never had a 500 four swinging arm next to a 750K. I was surprized that the 750 arm is a lot shorter.



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« Last Edit: December 21, 2019, 01:26:58 PM by Trigger »

Offline Colonial-Clive (yindi)

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Re: Lets build a SOHC for less than a grand
« Reply #50 on: December 21, 2019, 03:04:16 PM »
That answers a question I had in mind about the swing arm on my 500 frame, it’s a 750 one. It don’t half sharpen up the handling.

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #51 on: December 21, 2019, 03:18:24 PM »
I was thinking sort wheel base  ::) Does your have a std rear sprocket and how many links is your chain ?

Offline royhall

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Re: Lets build a SOHC for less than a grand
« Reply #52 on: December 22, 2019, 11:24:16 AM »
Does the wheel still look centered on the rear mudguard?

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Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #53 on: December 22, 2019, 12:30:11 PM »
Does the wheel still look centered on the rear mudguard?

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I have just fitted it loosely and it is in the centre to the frame.

The 500 four arm is
241mm ID rear ( at the wheel spindle )
228mm OD at the front
425mm from the centre of the swing arm mount to the centre of the swing arm shock mount.

The 750K arm is   
242mm ID rear ( at the wheel spindle )
228mm OD at the front
390mm from the centre of the swing arm mount to the centre of the swing arm shock mount.

That's a difference of 35mm and this is my concern's. This will be a different rake / angle on the rear shocks and what effect would that bring with a 750K arm fitted to a 500 four ?
« Last Edit: December 22, 2019, 12:31:57 PM by Trigger »

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #54 on: December 22, 2019, 01:03:41 PM »
Been throwing some parts on the frame to see what I have missing. Still got a 20kg bucket at the zinc platers and will not know on the fasteners until that is back.

The relocation of the ignition switch worked out well. Found a old switch in a parts box but, not sure if it is any good.



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« Last Edit: December 22, 2019, 01:07:12 PM by Trigger »

Offline Laverda Dave

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Re: Lets build a SOHC for less than a grand
« Reply #55 on: December 22, 2019, 05:13:49 PM »
The ignition barrel and key look the same as my old CB160!
1976 Honda 400/4
1977 Rickman Honda CR750
1999 Honda VFR 800FX
1955 750 Dresda Triton
1978 Moto Morini 350 Sport
1978 Honda CB400/4 'Rat' bike
1982 Laverda 120 Jota

Offline Colonial-Clive (yindi)

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Re: Lets build a SOHC for less than a grand
« Reply #56 on: December 23, 2019, 09:24:19 AM »
I was thinking sort wheel base  ::) Does your have a std rear sprocket and how many links is your chain ?
Yes trigger standard rear sprocket and I just put the chain on as I came from DS which when adjusted brings it half way up on the adjustment scale, I was waiting for a bit of stretch to take a link or 2 out.

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #57 on: December 27, 2019, 02:04:40 PM »
I was thinking sort wheel base  ::) Does your have a std rear sprocket and how many links is your chain ?
Yes trigger standard rear sprocket and I just put the chain on as I came from DS which when adjusted brings it half way up on the adjustment scale, I was waiting for a bit of stretch to take a link or 2 out.

I have done some maths on using a 750K arm on a 500 four and yes, it would improve the handling on the front end       ( making it more responsive ) but, the rear shock angle will upset the tail end suspension as you will loose a lot of damping and the spring will be operating like a pogo stick over any hard bumps  ;)

Offline Colonial-Clive (yindi)

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Re: Lets build a SOHC for less than a grand
« Reply #58 on: December 27, 2019, 03:40:46 PM »
Trigger I had noticed the rear end was rather hard even on the lowest setting but it’s nothing that you wouldn’t dial in with a set of after market set of shocks (Koni etc) to improve over standard 70s Honda anyway.

Offline Trigger

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Re: Lets build a SOHC for less than a grand
« Reply #59 on: December 28, 2019, 06:59:55 PM »
I have never really been a fan of tapered head stock bearings on SOHC's and have always used the OEM ball bearing type. The kit came with a 5mm and 4mm packing washer for the bottom yoke so I fitted the 4mm washer but, the stops on the yoke are just touching the stop on the frame. After a bit of measuring up, even if i machine off the washer to 3mm it is still nowhere near a fit like the OEM type.
Another problem I have found is with the taper bearings is, there is a 2mm gap from the top of the rubber in the headlight bracket to the top yoke  :o . I will go back to the OEM ball bearing type.



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« Last Edit: December 28, 2019, 07:02:19 PM by Trigger »

 

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