Author Topic: 750 K1 project  (Read 2530 times)

Offline Crispy

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Re: 750 K1 project
« Reply #45 on: May 07, 2018, 05:53:10 PM »
Damn!! Took the sump off  today and found these two pieces lying there...don't know where they've come from yet but it's a bit of a dampener on such a nice day!
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Offline Nurse Julie

  • 1973 CB750 UK K2.1977 CB550/4 Mongrel Brat. 1978 CB400/4.
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Re: 750 K1 project
« Reply #46 on: May 07, 2018, 06:04:36 PM »
Don't panic yet, they look like they are pieces of the internal casings.....i could be wrong of course but they look mighty familiar. As you strip the engine fully, just keep your eyes open for some bits missing around the mouldings on the casings.
« Last Edit: May 07, 2018, 06:06:47 PM by Nurse Julie »
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Offline Crispy

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Re: 750 K1 project
« Reply #47 on: May 07, 2018, 06:15:00 PM »
I have the engine in the stand, would you take it out and turn it upside down to split it or just carry on with it in the stand?
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Offline Crispy

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Re: 750 K1 project
« Reply #48 on: May 07, 2018, 06:52:33 PM »
Ok belay that last question..its out and upside down! 🙄
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Offline Crispy

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Re: 750 K1 project
« Reply #49 on: May 07, 2018, 07:11:59 PM »
Found the damaged area..right beside the primary chain tensioner. This critical?
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Offline Nurse Julie

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Re: 750 K1 project
« Reply #50 on: May 07, 2018, 07:19:21 PM »
I will ask Trig if he advises repairing or just leaving, I will report back.
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Offline Crispy

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Re: 750 K1 project
« Reply #51 on: May 07, 2018, 07:29:25 PM »
Thanks Julie! 👍
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Offline Nurse Julie

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Re: 750 K1 project
« Reply #52 on: May 07, 2018, 08:06:33 PM »
Thanks Julie! 👍
Trig says he would leave as is. It most probably would have been damaged by the cam chain flapping around at some stage in the engines life.
Im a Nurse, trust me, this won't hurt.....much !!!

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Offline K2-K6

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Re: 750 K1 project
« Reply #53 on: May 07, 2018, 08:30:02 PM »
If it's been apart before then it may have had the crank rotated with the cam not in place and the chain bunched down round the crank.

It doesn't look structural,  but I think they use things like that for "windage" to get oil to separate from the crank at high rpm and force it to drop back into the sump rather than getting a mass of oil rotating with the crank assembly.

Offline Crispy

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Re: 750 K1 project
« Reply #54 on: May 07, 2018, 08:47:31 PM »
Thanks folks..👍
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Offline Trigger

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Re: 750 K1 project
« Reply #55 on: May 07, 2018, 09:10:58 PM »
Normal on a 750  ;)

Offline Crispy

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Re: 750 K1 project
« Reply #56 on: May 07, 2018, 09:35:27 PM »
Phew was worried for a while.....👍
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Offline Trigger

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Re: 750 K1 project
« Reply #57 on: May 07, 2018, 10:54:50 PM »
Phew was worried for a while.....👍

When fitting a new cam chain, always use the upgraded DID  ;)

Offline Crispy

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Re: 750 K1 project
« Reply #58 on: May 08, 2018, 11:33:26 AM »
Phew was worried for a while.....👍

When fitting a new cam chain, always use the upgraded DID  ;)
👍 Will do..thanks.

Going to check the main bearings for wear next...for the K1 is the red plastigauge in the range 0.025-0.175mm the one to get? Just double checking, 🤔
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Offline Tomb

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Re: 750 K1 project
« Reply #59 on: May 09, 2018, 01:42:05 PM »
Just make sure that they know about old Honda's and have the right tooling. I spend half my day correcting other engineers work  >:( And if they mention that they do brit bikes, RUN  ;)

Hahahaha yep I know this feeling, I have the "special" reamer, and make my own guides, and do Brit bikes (run!!) but also do old Hondas, Yamahas, Suzukis. Back when I did engineering work for folk I'd get a lot of work repairing local bike shops "engineering work".

Old Brit bike work on guides usually consisted of making bigger outside diameter guides as they had come loose in the head and worn the head, or knurling standard guides. I'd always make them a really tight fit to prevent it happening again, this would usually end up nipping the guide making the stem tight and reaming needed.
Tom
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'62 CB77 Sprinter
'70 CD175
'78 CB550 with sidecar
'80 Z50R
And a load of old Yamaha 1100's