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Messages - SeanFD

Pages: [1] 2 3 ... 21
1
CB750 / Re: CB750 carb rebuild
« on: February 15, 2026, 10:37:14 PM »
Never mind that; what about the guy/machine who made the kit!

2
CB350/400 / Re: Gearbox Stuck - The last straw?
« on: January 06, 2026, 12:52:08 PM »
At the wheel; the swing arm bushes are new also.

3
CB350/400 / Re: Gearbox Stuck - The last straw?
« on: January 06, 2026, 12:31:40 PM »
Thanks Ken, I've sent you that.

Quick update:

I removed the internals of the neutral switch and filled the cavity with Hondabond. After several trials and tribulations – which included finding the countershaft thrust washer in the recess for the kickstarter as I was about to install the latter – I got everything back together and the engine replaced.

Now, I'm happy to report that all 6 gears are there, both up and down. The weather precluded a road test, so that will have to wait till next time.

I am convinced this bike has enjoyed her retirement so much that she is determined to frustrate all my efforts to get her back on the road; I did mention those trials and tribulations ...

The last one I discovered was when replacing the exhaust; I pulled on the rear wheel and thought is moved when it shouldn't have; it feels as if the rear bearings need replacing. But these and the damper bushes are NEW! Like less that 5 miles old!!

Maybe I haven't tightened the bearing retainer?? Next time!

4
CB350/400 / Re: 400 four main jet o ring
« on: December 29, 2025, 04:40:16 PM »
These are a perfect proven fit.1.2mmx3.5mm buna n70
Qty 36 was under $8.00 us

Are the dimensions reversed? 3,5 ID and 1,2 CS?

If so they are available here, though still not too cheap.

https://www.polymax.co.uk/catalog/product/view/_ignore_category/1/id/161306/s/o-ring-3-5mm-id-x-1-2mm-cs-fkm-viton-75-sha/category/9999/

5
CB350/400 / Re: Gearbox Stuck - The last straw?
« on: December 29, 2025, 04:25:31 PM »
If you mean the bolts on the gear selector parts, they are all 6mm; I don't think there is a listed torque fro them, but the general torque for those, AFAIK, in 5,8 - 8,7 ft-lbs.

The Common Service Manual says to use a bit of thread locker on the shift drum stopper plate bolt, so maybe add a little of all three.

6
CB350/400 / Re: Modern Rubber-Tire Pressure
« on: December 27, 2025, 10:52:58 AM »
Example as given above.

800/44 = 18.2lb potential from each psi.

625/2 = 312.5 lb per tyre (@ 50/50 weight distribution)

312.5/ 18.2 = 17.7 psi

Are those example figures given, or estimated  ? You'll need data from both tyres as they maybe different.

At 17.7 psi the bike will be unmanageable! Something not right there.
On my 750, I used Honda pressures and this resulted in more wear at the edges, leaving a ridge in the centre. Then I read, on the US site I think, that with modern rubber, pressures need to be much higher. Now I run 38/40 F & 40/44 R with more even wear.

7
CB350/400 / Re: Gearbox Stuck - The last straw?
« on: December 27, 2025, 10:43:23 AM »
So what was the issue? I must have missed that post.

My Haynes manual has torque values; in chapter 1 they are just below the specifications. I can send you a pic if you don’t find them.

Here’s a pace from the FSM; Haynes gives more for the engine.

8
CB350/400 / Re: Gearbox Stuck - The last straw?
« on: December 20, 2025, 08:46:23 PM »
Sure, that's fine.

No rush.

9
CB350/400 / Re: Gearbox Stuck - The last straw?
« on: December 19, 2025, 04:29:00 PM »
👍

But as I said Ken, no rush; get well first.

10
CB350/400 / Re: Gearbox Stuck - The last straw?
« on: December 19, 2025, 08:40:20 AM »
That'd be great.

The CMS website shows the -023 fitting everything from the 200-350-400, while the -013 only covers 200-350.

So I'm going for reverse compatibility, and will be happy with the -013.

I'm in N Ireland; I'll pm my address.

11
CB350/400 / Re: Gearbox Stuck - The last straw?
« on: December 18, 2025, 10:27:52 PM »
Ted, The bolt was just impossible to remove - I had loctited it in place and didn't loosen it before removing the engine from the frame. I went to my local workshop and used his air impact gun to loosen it.

It is indeed the neutral indicator switch. It is spring loaded, so what went wrong I have no idea. Anyone seen this before?

The part number is 35750-333-023. I've found one on eBay for about €80, posted to a friend there, so if you can do me a better deal Oddjob, that'd be great.

12
CB350/400 / Re: Gearbox Stuck - The last straw?
« on: December 18, 2025, 02:39:28 PM »
The problem turned out to be the secondary drive gear bolt; a quick visit to my friendly mechanic with the engine solved that.

The good news: I found the problem!

The bad news; well not really bad, but definitely ANNOYING!

[ Guests cannot view attachments ]

[ Guests cannot view attachments ]

Happy it is something so simple; mad that it was something so simple!

Now the quest to find a replacement. Anyone?

13
CB350/400 / Re: Gearbox Stuck - The last straw?
« on: December 16, 2025, 11:32:38 PM »
Do I need to remove the alternator rotor before splitting the cases, or can I leave it in place?

14
CB350/400 / Re: Gearbox Stuck - The last straw?
« on: December 15, 2025, 09:43:43 PM »
Nothing is impossible, there was a semi recent post on the US forum where a 750 had a broken selector drum, but in a lot of years thats the onluy one ive seen or heard of

We'll see tomorrow. I'll let you know.

15
CB350/400 / Re: Gearbox Stuck - The last straw?
« on: December 15, 2025, 09:43:06 PM »
In the internet photo is it definitely in neutral?

He had just installed it, pointing out the importance of locating the neutral detent, so I think so.

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