Author Topic: CB750 K3F - AKA The Red (Read 99118 times)

70CB750 · « **Reply #25 on:** February 04, 2013, 03:20:08 am »

Removed the original top shock mount. The hole is 12mm, the stud part for the shock is 15mm and the thread is M10.

70CB750 · « **Reply #26 on:** February 05, 2013, 02:53:30 am »

The new shock mount to accomodate the wider F swing arm. I used 3/4" 8 Grade bolt to make it, it still needs a washer beefore I weld it in.

70CB750 · « **Reply #27 on:** February 05, 2013, 02:54:10 am »

The rear master cylinder mount is ready to be welded in.

70CB750 · « **Reply #28 on:** February 05, 2013, 02:43:56 pm »

The shock mount ready to be welded in.

70CB750 · « **Reply #29 on:** February 07, 2013, 03:14:01 am »

The top shock mount is welded in. With some washers and spacers I will be able to line up the shock just right.

70CB750 · « **Reply #30 on:** February 07, 2013, 03:17:41 am »

Here is the master cylinder mounted. Now for the linkage.

70CB750 · « **Reply #31 on:** February 08, 2013, 03:02:52 am »

Cylinder linkage and brake line mockup.

70CB750 · « **Reply #32 on:** February 22, 2013, 04:24:07 am »

I emptied my work bench - had to fix chainsaw and replace forge blower motor first - and pulled the F engine head.

The #1 valve guides seem to be tight, but I have to check all of them. Time to make C Clamp adaptor for spring compressing.

70CB750 · « **Reply #33 on:** February 22, 2013, 04:25:42 am »

There is some carbon deposit, but nothing serious.

SOHC4 Cafe Racer Fan · « **Reply #34 on:** February 23, 2013, 08:32:30 am »

That some cool adaptation work to mount the F MC onto the K frame with a made from scratch linkage.

70CB750 · « **Reply #35 on:** February 23, 2013, 08:52:10 am »

Thank you

Still trying to figure out the brake pedal setup.

70CB750 · « **Reply #36 on:** February 25, 2013, 03:50:19 am »

Made an adapter for a C-clamp to be used as valve spring compressor. It works well enough.

70CB750 · « **Reply #37 on:** February 25, 2013, 03:54:23 am »

With valve springs off, I will need to measure and check the play between valve guide and the valve stem. The leak test was positive - i.e. no leaks. I used 2 stroke gas mix. The passages under the exhaust valve and under the intake valve stayed dry, no gasoline made it past the valve. That is a good thing.

But # 2 and # 4 intake valves are in bad shape. Look at the detail of #2, the hole is 0.8 mm deep.

70CB750 · « **Reply #38 on:** March 01, 2013, 03:43:37 am »

Diassembled the valve train and cleaned top of pistons.

70CB750 · « **Reply #39 on:** March 03, 2013, 04:58:03 pm »

Washing head in the kitchen sink

iron_worker · « **Reply #40 on:** March 04, 2013, 06:36:07 am »

Who needs a parts washer?

lol

IW

70CB750 · « **Reply #41 on:** March 11, 2013, 09:08:12 am »

The blasted head.

70CB750 · « **Reply #42 on:** March 11, 2013, 04:26:59 pm »

I baked the head @ 300F, right after pizza, and drove guides out with a drifter.

The guides are actually visibly oblong.

70CB750 · « **Reply #43 on:** March 13, 2013, 03:44:04 am »

I was not happy with the master cylinder location and alternating K brake pedal was just too half a$$ for my liking.

I moved the cylinder down and changed the angle too.

70CB750 · « **Reply #44 on:** March 13, 2013, 03:45:20 am »

From Grade 5 bolt turned a new pivot.

70CB750 · « **Reply #45 on:** March 13, 2013, 03:46:02 am »

The pivot will sit in the frame like this.

70CB750 · « **Reply #46 on:** March 13, 2013, 03:48:12 am »

The new brake pedal mockup.

70CB750 · « **Reply #47 on:** March 21, 2013, 04:05:29 am »

I made a simple power source for electrical testing.

70CB750 · « **Reply #48 on:** March 21, 2013, 04:07:46 am »

The neutral switch wire was loose, I pulled the switch out. It just slides in and the little bolt and bracket holds it in.

70CB750 · « **Reply #49 on:** March 21, 2013, 04:09:51 am »

This is were it came from, will replace the o ring and solder the wire back together.

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Author Topic: CB750 K3F - AKA The Red (Read 99118 times)