Author Topic: CB750 K3F - AKA The Red (Read 118589 times)

70CB750 · « **Reply #325 on:** April 23, 2015, 02:42:34 PM »

The #$%* always flies from the side you are not expecting it. I was not sure about the head, pucks, charging system but I would never imagine I will have to pull the engine because of transmission. It just simply does not shift from 2nd up.

Fork? Who knows.

calj737 · « **Reply #326 on:** April 23, 2015, 04:10:19 PM »

At way to peek up her skirt from underneath? Maybe something visually can be confirmed. Doubtful since the gears are so far back, but who knows-

edwardmorris · « **Reply #327 on:** April 23, 2015, 06:39:01 PM »

Bottom end can be taken apart without messing with the top end as long as you don't need to touch the crank. Sorry for your troubles, hopefully it'll get sorted soon.

70CB750 · « **Reply #328 on:** April 24, 2015, 02:57:18 AM »

Yeah, that's the plan. Pull the engine, flip it over and open it up.

Roach Carver · « **Reply #329 on:** April 24, 2015, 04:04:31 AM »

Doesn't shift at all? It's not the shift mechanism under the cover on the left is it?

70CB750 · « **Reply #330 on:** April 24, 2015, 04:10:30 AM »

With engine off, I can get it to all 5 gears. It involves some wheel rocking.

But on the road it only has 1 and 2, never goes to 3rd.

Kickstart · « **Reply #331 on:** April 26, 2015, 07:15:10 PM »

Argh... sorry to hear that Prokop.

Does it make any noise when you try to go into third, like a clunking or clattering noise?

I had to open my engine back up... I threw together this upside down stand, that worked out nicely.
http://forums.sohc4.net/index.php/topic,107713.msg1642736.html#msg1642736
It made it a easier to flip the engine over (still had my son help), and I was able to access both sides while it was upside down so I didn't have to flip back over to bolt the fasteners on the top half when putting the cases back together.

70CB750 · « **Reply #332 on:** April 27, 2015, 02:45:43 AM »

That's a neat idea, Chris, thank you.

No it makes no noise, the lever just stops dead and what it seems little short of actually shifting.

turkey4me · « **Reply #333 on:** April 27, 2015, 06:26:44 AM »

If you need any parts, I have an F3 bottom end that I'm parting out. Hopefully you sort out your gearing.

70CB750 · « **Reply #334 on:** April 27, 2015, 06:37:09 AM »

Quote from: turkey4me on April 27, 2015, 06:26:44 AM

If you need any parts, I have an F3 bottom end that I'm parting out. Hopefully you sort out your gearing.

I will take any of these parts:

I still believe it is in the shifting mechanism somewhere.

Thanks!

70CB750 · « **Reply #335 on:** April 30, 2015, 04:03:11 AM »

I cleaned and polished all the shifting linkage, it made no difference.

On the positive side, she is charging when she runs.

I will need to pull the engine, there must be something wrong.

MoMo · « **Reply #336 on:** April 30, 2015, 02:39:58 PM »

^

I have not touched my Red Rider 750 with the F motor because of a shifting problem in 4th gear

Good luck with it Prokop

70CB750 · « **Reply #337 on:** May 03, 2015, 08:37:04 AM »

There she is. Double o-rings under neutral switch solved the shifting problems and she shifts like new.

seanbarney41 · « **Reply #338 on:** May 03, 2015, 09:15:55 AM »

Glad to hear you figured it out. Bike looks good...how about some more pics.

Stev-o · « **Reply #339 on:** May 03, 2015, 09:56:52 AM »

Looks great, good to hear shes a shifter. Nomming you for BOTM....

SOHC4 Cafe Racer Fan · « **Reply #340 on:** May 03, 2015, 11:39:53 AM »

Seconded. Please post your acceptance of the nomination in the BOTM Nomination thread:

http://forums.sohc4.net/index.php/topic,147381.0.html

70CB750 · « **Reply #341 on:** May 03, 2015, 01:15:41 PM »

Quote from: Stev-o on May 03, 2015, 09:56:52 AM

Looks great, good to hear shes a shifter. Nomming you for BOTM....

I am honored, Stev-o, but Comstars and BOTM? LOL!

Anyway, accepted. Will have detail pictures and a story in few days.

Stev-o · « **Reply #342 on:** May 03, 2015, 02:24:13 PM »

Quote from: 70CB750 on May 03, 2015, 01:15:41 PM

Quote from: Stev-o on May 03, 2015, 09:56:52 AM
Looks great, good to hear shes a shifter. Nomming you for BOTM....

I am honored, Stev-o, but Comstars and BOTM? LOL!

Hey, ya never know?! Black rims have won and Sam hated them!

SOHC4 Cafe Racer Fan · « **Reply #343 on:** May 03, 2015, 06:33:46 PM »

Not all Comstars are bad. I confess they've grown on me a little over the years. Still haven't put any on a bike.

Retro Rocket · « **Reply #344 on:** May 03, 2015, 06:40:07 PM »

Quote from: CB750 Cafe Racer Fan on May 03, 2015, 06:33:46 PM

Not all Comstars are bad. I confess they've grown on me a little over the years. Still haven't put any on a bike.

I like the boomerang comstars we got on the boldor series bikes...

SOHC4 Cafe Racer Fan · « **Reply #345 on:** May 03, 2015, 06:41:23 PM »

The reverse Comstars are better than ok. I like the wheels on this bike.

Kickstart · « **Reply #346 on:** May 03, 2015, 07:39:18 PM »

Great news!

Looking great... I like the way the comstars look on your bike.

Just curious... how did the double o-rings on the neutral switch cause the shifting problem... and was the neutral light always on?

70CB750 · « **Reply #347 on:** May 04, 2015, 02:55:57 AM »

Quote from: Kickstart on May 03, 2015, 07:39:18 PM

Great news!

Looking great... I like the way the comstars look on your bike.

Just curious... how did the double o-rings on the neutral switch cause the shifting problem... and was the neutral light always on?

The double O-ring actually allowed me to shift all the way up and down and smoothly. It tells me the problem is somewhere around the switch seating, but the shifting forks are - as far as I dare to say - okay.

Will try different switch now.

MoMo · « **Reply #348 on:** May 04, 2015, 05:08:12 AM »

You think the switch was down too far and binding against the drum? Extra O-ring raised it enough to prevent that? Interesting fix, may try the same on the F engine in my K4...Larry

70CB750 · « **Reply #349 on:** May 04, 2015, 05:24:52 AM »

Quote from: MoMo on May 04, 2015, 05:08:12 AM

You think the switch was down too far and binding against the drum? Extra O-ring raised it enough to prevent that? Interesting fix, may try the same on the F engine in my K4...Larry

I suspect the shoulder of the switch against the drum groove edges, just dragging little bit.

But I polished the switch and gthere was no witness mark on it.

News:

Author Topic: CB750 K3F - AKA The Red (Read 118589 times)