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Topics - gtmdriver

Pages: [1] 2
1
CB350/400 / Sudden Loss Of Drive. CB350F
« on: July 25, 2021, 04:26:32 PM »
I was accelerating the bike hard up a slight hill and when I let the clutch out in fifth fear the revs shot sky high and there was no drive.

At first I thought that I had missed the gear but I checked and it was engaged correctly.

I slowed down and tried all the gears and the symptoms are the same in every gear.

There is drive at low throttle openings but as soon as any sort of power is applied drive is lost completely.

It doesn't feel like clutch slip. A slipping clutch is usually less noticeable in the lower gears but gets worse in the higher gears. This problem is much the same in every gear. I'm wondering if I might have stripped something in the primary drive.

Are there any known issues which I should check first?

2
CB350/400 / First Show For a Long Time.
« on: June 14, 2021, 09:22:12 AM »
Had the CB 350F out to a show for the first time since lockdown started.

Early morning at the Scout Centre Newton Aycliffe near Darlington. Organised by Northern Bygones.


3
CB350/400 / Manual cam chain adjuster CB350F
« on: May 30, 2020, 03:51:04 PM »
I fitted one of these manual cam chain tension adjusters to my CB350F. It's a known problem area on the 350 and 400 fours.

It won't help if the adjuster is seized but it will help if it's just weak springs.

It replaces the blanking bolt at the top of the adjuster block and allows you to manually depress the adjusting plunger.

Some people just push a thin screwdriver down there to do the same thing but this is a little more reproduceable.

I'm tightening it half a turn at a time so that I don't over tighten it.


https://4into1.com/ttr400-manual-cam-chain-adjuster-bolt-honda-cb350f-cb360-cb400f/

4
CB350/400 / 400 into 350 swap?
« on: April 30, 2018, 04:50:59 PM »
I have a CB350F with a tired engine. There is a lot of blowby and crankcase pressurisation.
I want to rebuild the 350 engine but here in the UK spares are rare and it make take some time.
To avoid the bike being off the road I would like to temporarily fit the complete engine from a CB400F.
Apart from the clutch operation are there any other differences?
My bike has the full 4 pipe system. Will that couple up to the engine OK?

5
CB350/400 / CB350F NOS carrier fitted.
« on: April 19, 2018, 08:04:01 PM »
I've finally got round to fitting my new very old stock Fox Honda carrier to my CB350F.

I got in from the USA on eBay.



It fits well and retains the stock grab rail with the indicator mounts. It also has support brackets at the back which bolt to the number plate bracket.

I spite of it's age it looks quite modern in it's styling.

Now all I have to do is to work out a way of mounting the Givi base plate without drilling holes in the new rack.

6
CB350/400 / CB350F Aftermarket 4 into 4 exhaust. NOW GONE.
« on: September 16, 2017, 08:18:08 PM »
When I bought my CB350F it had non-standard 4 into 4 pipes fitted. I was told, by the seller, that it was an American aftermarket system but I have been unable to confirm this or identify the manufacturer.







The system needs a good clean up and, like many aftermarket products, needs a bit of fiddling to fit but it does fit and it does work.

In my opinion it looks and sounds a lot better than the 4 into 1 aftermarket systems available for this bike. The whole point of the CB350F was the 4 separate exhaust pipes.

I have now managed to find a pattern replica system for my bike so the original set up is surplus to requirements.

If you are prepared to collect it you can have it for nothing. I live near Chester le Street, County Durham.

...

It has been suggested by a couple of forum members here and in the US that the system is actually made up from CB350F downpipes and CB550F silencers. That may well be the case. Either way the comments above still apply.



7
CB350/400 / New Paint and moving bits.
« on: August 29, 2017, 11:29:09 AM »
A little late to catch all the summer rain but I've finally finished reconditioning and repainting my Honda CB350F.



I've replaced

Chain and sprockets
Swinging arm bushes
Swinging arm pivot pin
Rear spring dampers
Rear brake shoes
Rear wheel bearings

Steering head bearings
Fork legs (re-chromed)
Fork seals
Front wheel bearings
Master cylinder internals
Front caliper seals
Brake hoses
Brake pads

Regulator/rectifier
Flasher unit
Battery
Front indicators and stalks
Pattern exhausts

OEM headlamp and shell
OEM ignition switch location

and I've repainted the tank, side panels, fork shrouds and the headlamp shell.

It's not the Honda Custom Bacchus Olive. I wasn't keen on that. It's Rover British Racing Green Metallic.

Originally the headlamp shell was black but I think it looks better in the same colour as the rest of the bodywork.




8
When I bought my imported Honda CB350F it had an American after-market 4 into 4 exhaust fitted.









I have just fitted an OEM replica system so the old exhaust is now surplus to requirements.

The silencers are separate from the pipes so there is a lot more adjustability than the OEM system but, being after-market, it needs some careful fitting to avoid fouling the side stand.

There is some surface rust on the inner surfaces and a welded repair has been made to one downpipe but, as you can see from the photos, this is not normally visible.

It sounds great. I took to riding without ear plugs so that I could listen to it at high revs.

If anyone is interested I will clean it up and post some more pictures.

I would be looking for £100 or so. I can box it up if you want to arrange a courier but personal collection would be better.

I'll give it a week on this forum first then put it on eBay.


9
CB350/400 / Suitable rear dampers.
« on: July 29, 2016, 12:24:57 PM »
I'm looking to fit a set of Hagon 2810 adjustable spring/damper units to my 1974 CB350F in place of the worn OEM units. These OEM units are 320mm centre to centre.

Hagon don't specifically list this bike in their catalogue but Part No 31011 is listed for the later CB400F/F2 and the CB350T of the same period. This damper is 310mm centre to centre. Hagon don't have a 320mm damper with a forked lower fitting in their 2810 range. Would I notice the difference with a 10mm shorter damper? The next size up is 335mm which would jack the back end up 25mm (1") over standard.

10
CB350/400 / AGM batteries
« on: July 09, 2016, 08:09:48 PM »
I am looking to replace the battery on my CB350F and I would like to fit an AGM unit but I have had a bad experience with one in the past.

My Moto Guzzi California III managed to overheat an Odessy battery causing the plates to buckle, the acid to boil and the casing to split. I suspect that it was caused by poor regulation of the alternator output. The bike had a Saprisa permanent magnet alternator so the regulator was basically a Zener type and it seemed to produce 14v or more under almost all conditions.

I have fitted an Electrex World RR24 Rectifier/Regulator to the Honda so it should be a great deal more sophisticated.

Does anyone out there have any experience of AGM or Gel batteries with these modern solid state control units?

11
CB350/400 / Brake master cylinder. Rebuild oem or pattern?
« on: April 05, 2016, 11:20:04 AM »
My 1974 CB350F could do with some work on the front brakes.

Pacre Classic are selling pattern replacement master cylinders for £56 or so.

Does anyone have any experience with this component or the company in general?

Are these parts any good or should I rebuild my 42 year old component?

12
CB350/400 / R/H exhaust bracket needed.
« on: March 23, 2016, 01:26:27 PM »
Has anybody got an offside (R/H) exhaust bracket for a CB350F that they would be prepared to sell?

13
CB350/400 / Boyer Bransden ignition system first report.
« on: October 14, 2015, 10:14:26 AM »
A couple of weeks ago, while I was sorting out an ignition problem, I also decided to change to a contactless electronic system. I chose to go with the Boyer Bransden unit, Kit 00089, which is listed for the CB400F and CB750F but, with advice from this forum, I assumed it would fit my 350F too. It cost around £130 with carriage.

Mounting the small electronic control box took most time but I finally fitted it under the frame below the seat nose using Ty-Wraps.





Fitting the rest of the kit was no problem. The whole points backplate is removed. The advance unit is taken off so that the springs and bobweights can be removed then it is refitted onto the crank. The Boyer Bransden unit has a built in electronic advance curve so the bobweights and springs are no longer needed.The circular circuit board replaces the original backplate and the magnetic rotor bolts onto the remains of the advance unit. The original wiring loom can be used but I made up a new loom as far as the connectors under the air filter box.





Like all aftermarket ignition systems the BB unit is designed to work with the stock coils. I checked these and found that they had a primary coil resistance of 4 ohms. I had suspected a coil fault so I was replacing them with new coils from DS Spares. Fortunately I also had the presence of mind to check the replacements which was just as well as they only had a 2.2 ohm primary resistance which would have drawn far too much current through the BB electronic box. After checking with BB I used a couple of 1.6 ohm ballast resistors, one in the power feed to each coil.






The initial set up, described in the instructions, gets the bike started then you can use a strobe to accurately set the timing using the full advance timing marks.

An interesting feature of the BB ignition is that, with two pick up coils replacing the contact breakers and TWO rotating magnets replacing a single cam lobe ALL four plugs fire together all the time

I contacted Boyer Bransden to find out the thinking behind this and they said

"There are a few reasons. Its more accurate, once its completed one revolution, the system will find a central point for sparking and that will never change. Because of this, it makes setting up much easier and can be done on any cylinder. It also burns un-burnt fuel ready for the next firing stroke which improves the running and emissions of the engine."

I have had the bike out a few times with this system fitted and it is a definite improvement over the old (and possibly a bit iffy) coils and contact breakers. It is smoother and more tractable at lower revs (probably due to the slower advance curve) and definitely pulls better at high revs too.


14
In the 5 weeks since I got my CB350F it's come along quite a bit.

When I bought it it had this godawful fairing on and was running very roughly.



Since then I've put in a fair amount of work.

The fairing has gone but the headlamp unit was the wrong one for the bike so I've temporarily fitted a complete chrome unit.

I've refitted proper indicators. The stalks are Honda but not quite the correct ones.

I cleaned out the tank and fuel tap, stripped, rebuilt and reset the carbs, fitted new points, condensers and plugs and gave the engine a full service. It now runs very nicely.

I removed and greased both stands then pulled out the rear wheel and mudguard.

The mudguard has been de-rusted, treated and undersealed with stone chip. I changed the chain and sprockets, the wheel bearings, the brake shoes and the tyre, tube and rim tape.

I managed to get a universal carrier to fit and a friend gave me the top box so, after a good clean, it now looks like this. Not massively different but definitely on the right track.



So far so good. Then I took it for a run across to Carlisle from Chester le Street and on the way back a coil failed and I lost cylinders 1 and 4. To be fair I suspect it's my own fault as a couple of days ago, while I was doing some wiring work, I accidentally left the ignition switched on for an hour or so while I had a lunch break. I suspect I must have seriously overheated the 42 year old coil.

More annoyingly, at some point in the ride I lost the L/H side panel logo. the one that says "350 4". I know DS has then but they're not exactly the same as the original.

So on Monday I'll order a pair of coils and a new logo and get down to a little more work. I guess these things are sent to try us.

15
CB350/400 / Boyer Bransden ignition.
« on: September 22, 2015, 10:07:12 AM »
Has anyone fitted one of their CB400F units (KIT00089) to a CB350F by any chance?

It completely replaces the points, condensers, the backplate AND the mechanical advance unit.

It has a built in electronic advance curve which has the same full advance figure as the CB350F but reaches full advance at 3500 rpm rather than the 350's 2500 rpm.

I don't think that would matter a damn in practice but I'd like to know if the Boyer Bransden unit will physically fit into the 350F

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