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1
Desperately Seeking!! / Keihin 75 Main Jets
« on: August 19, 2022, 08:17:36 PM »
Does anyone have a set of 4 Keihin main jets (std mains for 400)  that they would be willing to part with please ?

Andy

2
Member 4 Sales / CB400 Raask Rear Sets
« on: July 30, 2022, 10:18:34 AM »
I have a set of Raask rear sets that I was going to use on my 400, but never got around to fitting and have now decided not to.

Bought them as a used set a few years back and they have been gathering dust in the garage ever since.

If anyone is interested, then let me know and I’ll send or add some photos.

Note that you cannot use the kick start with these fitted.

Andy

3
Hi All,

Does anyone have a spare air filter box clamp for a 400 that they can do without  ?  I'm looking for the large oval clamp that secures the plastic plenum chamber to the air filter box.

Thanks in advance for any help !

Andy



4
CB350/400 / Another 400 Lives
« on: September 05, 2018, 11:09:08 AM »
Apparently there are far too few Parakeet Yellow 400’s around these days, so I’m happy to report that one more is now alive !

I know we love a pic, so here’s a snap of my recent project having completed a quick test ride at the weekend – I have since discovered a minor oil weep that I suspect is oil pressure switch related, and a brake fluid leak from around the lever that I’m hoping a repair kit will fix – lesson learned there as the master cylinder was the only part not stripped and rebuilt as it actually looked in good shape !

[ Guests cannot view attachments ]

I ‘accidentally’ bought the bike in boxes 18 months ago from a chap who was emigrating and I was very pleased to find a lot of the small, hard to get original parts were still in various boxes and bags.  It has/had a few period add-ons with a Dresda arm that has now been replaced with an original, a Cibie headlight and some engine work apparently carried out by Dixon racing in the 80’s comprising a Yoshi big bore kit and some head work.  On stripping the engine, I found the bores were heading towards the upper piston / bore clearance and borderline oval, so had to bite the bullet and get Cruzinimage’s 54.5mm pistons to give me a last chance oversize vs. Yoshi’s 54mm item – we’ll see how that goes, and I now have a spare set of std bore barrels as a fall back plan !

A quick thanks to Ken (Oddjob), Kev (fryerk) and to Graham & Julie who very kindly donated a few engine bolts, clips and oil galler caps to help me along the way.

Hoping to get the oil switch and master cylinder sorted and get a few miles on Peter (Kent400)’s shiny refurbed gauges before the weather changes – will also get a few nicer images to share !

5
CB350/400 / Clutch Cover Stuck !
« on: April 22, 2018, 09:36:54 AM »
My list of things to do includes changing the kick start shaft and lever on my 400, so a simple job has stalled because I cannot get the bloody clutch cover off.  Seems rediculous, but it won't budge and I can't get any purchse on any surfaces to persuade it to move - anyone else had similar problems ?  Any ideas ?

Andy

6
CB750 / CB750 Offered - worth a go ?
« on: July 30, 2017, 07:17:12 PM »
I've been offered a UK K2 that's in need of restoration.  All the chrome is scrap, needs an exhaust system and it has the wrong tank.  Engine turns over but not running.  Obviously difficult without photo's (will add some when I get them) but it's offered for £650 - sound about right for a money pit project ?

Andy

7
Tricks & Tips / Mudguard Rust Proofing Recommendations Please
« on: July 25, 2017, 09:18:17 AM »
I now have some nice new shiny bits to bolt on, so before I do, what would people recommend for preventing / reducing rust underneath mudguards - Waxoyl, Por15, paint, others  ?

8
CB350/400 / 400 Cam Chain Tensioner Arm
« on: June 29, 2017, 09:27:38 AM »
Any places other than DSS to source a replacement tensioner arm for a 400/4 that people would recommend ?  I got my last one from Peter Arnold of PACRE, but he seems to have disappeared ?

I stripped the engine of my 400 last night and found that the pivot point of the arm has been chewed by the cam chain - not enough for it to seize, but enough for it to feel a little sticky at the extremes of it's movement.  I did clean it up with a small file, but I think I'll replace anyway to be safe !

Andy

9
CB350/400 / Airbox Snorkel Spring Thingy
« on: May 24, 2017, 03:48:55 PM »
No idea what the technical term is, but my continuous springy thing that helps to retain the snorkel on the dirty side of the airbox is no longer continuous !!

Any idea where I might find one as they appear nla from usual places, and I'm not too sure what to google for (continuous springy thing didn't seem to find anything suitable !!)

Andy

10
CB350/400 / Dresda Swinging Arm Anyone ?
« on: March 26, 2017, 11:58:05 AM »
Morning all,

Has anyone got a 400/4 with a Dresda arm ?  My latest project came in various boxes and has a Dresda arm, but I can't find the rear axle spacers, so wondering if anyone has similar and wouldn't mind a quick measure of the spacers either side please ? 

Any help greatfuly received !

Andy

11
CB350/400 / Re-plating hardware
« on: March 05, 2017, 10:56:26 AM »
Morning all,

What's the general consensus on re-plating hardware ?  I've got a few weeks wait for Philpotts to rechrome the stantions and for the delivery of new wheel rims, so I have started to think about making good the various nuts and bolts.

Is it a good idea to zinc the axles and s/arm pivot bolt ?   I'm expecting to get the engine bolts and most of the various bolts for the frame re-plated and a brief search on here suggests sending to Allenchrome as a good start ?

Thanks !

Andy

12
CB350/400 / 400 Rims Advice
« on: March 01, 2017, 08:50:22 PM »
After some advice or recommendations on new wheel options for my 400 please.

DSS's DID chrome rims don't seem rediculously priced, but no SS spokes, only galvanised ?

Any other options that others have used or would recommend ?

Would ideally like to refurb the original rims, but I think they're a bit too far gone, and good metal finishers seem rare !

Andy


13
Misc / Open / Essex Air Ambulance Run - Sept 11
« on: September 12, 2016, 09:06:09 AM »
Went along to watch the start of the 2016 Essex Air Ambulance run on Sunday - mostly modern sports bikes, but I did spot a couple of very tidy 400/4, a very smart gold 500/4 and a glimpse of a 750 in the middle of the pack somewhere !  Anyone on here ?

Fantastic weather for the run, a great cause and , as usual, I wish I had taken a camera with me.

Andy

14
CB350/400 / 400/4 Carb Top Gasket
« on: September 03, 2016, 10:59:11 AM »
Anyone know if these gaskets are available as a separate item ? 

Many thanks !

Andy

15
CB350/400 / 400/4 Hot Idle Problem
« on: July 04, 2016, 09:33:23 AM »
I’m having hot idle problems with my 400/4, and I’m not sure what to do next !  Any help or suggestions would be gratefully received !

The bike starts from cold ok with a bit of choke and then quickly settles at a 1200rpm idle off choke.  Pulls ok and will return to idle whilst still warming up, but after 10 miles or so when hot it just won’t idle and will die when trying to open the throttle from idle or low engine speed.  Above 2500rpm, all is fine and it pulls well, it’s just that 1200 – 2500 making it a pain in traffic and at junctions.   

I’m sure it has to be carb related, and I thought I’d found the problem with float heights at 24mm, but after resetting floats to 21mm it is still stalling when hot.  Float chambers are clean of any debris, Idle jets are clear and the fact that it revs fine when >2500 suggests the main jet / needle circuits and tank to carbs fuel delivery are fine and I think it would rule out ign (new plugs and caps with Boyer ign at std timing)

I have ranged the air screw settings from 1.5 turns to 3 turns in ½ turn steps and it affects idle to main jet transition as you’d expect, but it still cuts when hot – I’m thinking about dropping the float height another 2mm to make sure the idle jet is sat in fuel – maybe a bit of vapourisation when hot or a slightly porous float ?

I’m running K&N filters with a 0.82 main jet and needles raised a notch and plugs look spot on – I know from air filters are notorious for tuning games  - would they really cause such a dramatic running problem ?

Any ideas or suggestions ?

Many thanks in advance !!

Andy

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