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Offline AndyH

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Oil restrictors 750K1
« on: January 18, 2020, 01:35:22 AM »
An ex-work colleague of mine has a 750K1 in bits, with damaged/missing oil restrictors in the head.
As far as I'm aware, these are now unobtainium.  Is there any solution?  Is it worthwhile him having the head machined to take the later version restrictors?
I have no knowledge/experience with this but hoping someone here may have a solution.
TIA
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1971 CB750K1 (US import)
1972 CB500 Four K1 (SOLD)
Previously owned..
1967 Honda Sports 90
1971 Yamaha CT2 175
1973 Yamaha RD250
1975 Kawasaki KX125
1983 Yamaha XT250T
BMW R65
BMW R80
BMW R100LT

Offline bryanj

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Re: Oil restrictors 750K1
« Reply #1 on: January 18, 2020, 02:30:43 AM »
Try yamiya i seem to remember seeing them there
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

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Offline 69cb750

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Re: Oil restrictors 750K1
« Reply #2 on: January 18, 2020, 04:54:55 AM »
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Offline lash

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Re: Oil restrictors 750K1
« Reply #3 on: January 18, 2020, 05:18:55 AM »
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Offline ekpent

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Re: Oil restrictors 750K1
« Reply #4 on: January 18, 2020, 08:43:14 AM »
« Last Edit: January 18, 2020, 08:46:07 AM by ekpent »
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Offline lash

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Re: Oil restrictors 750K1
« Reply #5 on: January 18, 2020, 09:19:55 AM »
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Offline PeWe

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Re: Oil restrictors 750K1
« Reply #6 on: January 18, 2020, 10:16:12 AM »
Quote from: lash on January 18, 2020, 09:19:55 AM
Another one..
https://www.yamiya750.com/index.php?main_page=product_info&cPath=246_21_249_51&products_id=3849
That should work instead of the stock shower head as Eric mentioned with an OK link.
 The other ones for later heads.
Even earlier heads had just a hole drilled.
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
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http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline AndyH

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Re: Oil restrictors 750K1
« Reply #7 on: January 18, 2020, 10:47:07 PM »
Thanks folks, I'll pass the info on.
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1971 CB750K1 (US import)
1972 CB500 Four K1 (SOLD)
Previously owned..
1967 Honda Sports 90
1971 Yamaha CT2 175
1973 Yamaha RD250
1975 Kawasaki KX125
1983 Yamaha XT250T
BMW R65
BMW R80
BMW R100LT

Offline HondaMan

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Re: Oil restrictors 750K1
« Reply #8 on: January 19, 2020, 06:09:56 PM »
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See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

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Offline 70CB750

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Re: Oil restrictors 750K1
« Reply #9 on: January 20, 2020, 04:26:02 AM »
Quote from: HondaMan on January 19, 2020, 06:09:56 PM
Quote from: lash on January 18, 2020, 09:19:55 AM
Another one..
https://www.yamiya750.com/index.php?main_page=product_info&cPath=246_21_249_51&products_id=3849

Hmmm...maybe I should make some of those on my lathe?   ::)

I made about 8 or 10 few years back, major pita.  ;D

Question:  on K0, should I keep the original "shower head" style or is there a way to replace it?
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Offline bryanj

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Re: Oil restrictors 750K1
« Reply #10 on: January 20, 2020, 06:38:30 AM »
If you look at the yamiya link it shows a replacement
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!
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