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Author Topic: 81 CB 750C  (Read 6638 times)

Offline brad black

  • Posts: 132
Re: 81 CB 750C
« Reply #60 on: Mar 04, 2017, 19:46:54 »
mark where the contact is, cut the center out and weld in part of the original rear guard.  the bike you showed in your first post has the original rear guard under the tail, probably why.

Offline CB MIKE

  • Posts: 71
Re: 81 CB 750C
« Reply #61 on: May 30, 2017, 14:06:05 »
Progress has been slow due to working full time, school part time, and family obligations. I have made some progress though and been buying parts here and there. I'm hoping someone can review my proposed valve clearances. I am confident swapping shims I can improve the clearances. My concern is with intake 6 & 8. I can buy new shims but I'm not sure which side to lean toward they come in increments of .05mm. My ideal shim would be 2.68mm, so do I go with 2.65 which leaves me with .161mm clearance or do I go with 2.70mm to get .111mm clearance? Please help before I buy new shims!

The yellow are shims to be used somewhere else. Green is a good fit to get proper clearance. Red is a new shim I need to buy. All dimensions are in mm except the ones noted as inches "



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« Last Edit: May 30, 2017, 14:48:12 by CB MIKE »
81 CB750C

Offline Ant36

  • Posts: 17
Re: 81 CB 750C
« Reply #62 on: Jun 01, 2017, 08:43:47 »
I would go with the 265 I am under the impression the larger clearance is better than tighter because they can be expected to tighten over time.


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1980 CB750F

Offline Cookie

  • Posts: 546
  • God help the child who grows out of everything
Re: 81 CB 750C
« Reply #63 on: Jun 01, 2017, 09:07:24 »
Most people I've spoken to on the subject consider .005" (0.127 mm) clearance to be ideal. 0.165mm works out to about .0065", youd be pretty close to ideal with that measurement.
* Insert something witty here *

81 CB750C
84 Tempter - well, most of it...

Offline CB MIKE

  • Posts: 71
Re: 81 CB 750C
« Reply #64 on: Jun 01, 2017, 17:36:37 »
I appreciate it gents, I was thinking the same. I will go with the larger clearance 2.65mm it is. Thanks.

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81 CB750C

Offline bgidman

  • Posts: 1
Re: 81 CB 750C
« Reply #65 on: Jun 01, 2017, 20:33:02 »
Mike I have the same bike..same year.  What is that seat...that exactly what I'm looking for.

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Offline Ant36

  • Posts: 17
Re: 81 CB 750C
« Reply #66 on: Jun 01, 2017, 22:16:23 »
Speaking of the seat how did you make out with the clearance?


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1980 CB750F

Offline CB MIKE

  • Posts: 71
Re: 81 CB 750C
« Reply #67 on: Jun 02, 2017, 13:51:41 »
Mike I have the same bike..same year.  What is that seat...that exactly what I'm looking for.

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I haven't finished with a seat yet, if you're referring to the pic earlier in this feed I reshaped the original seat foam. I've since scrapped that and welded an upswept hoop, then welded sheet metal underneath as a "fender". I'm working on the cowl area now and started a custom seat pan.

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81 CB750C

Offline CB MIKE

  • Posts: 71
Re: 81 CB 750C
« Reply #68 on: Jun 02, 2017, 13:55:18 »
Speaking of the seat how did you make out with the clearance?


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I am just going to run the f shocks because they're a bit longer and then look into a cbr wheel swap later down the road. I will have slightly more than 3" which is more than a lot of bikes I've seen run. Flawed logic I know but I'm going with it.

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81 CB750C

Offline Ant36

  • Posts: 17
Re: 81 CB 750C
« Reply #69 on: Jun 02, 2017, 17:58:49 »
Looking good! I'm doing something similar with an 750f.


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1980 CB750F