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CB500/550 / Re: Ongoing PD46 carburettor woes (possibly)
« Last post by jeremypeachey on Today at 09:28:01 AM »
Bryanj yes I think some models have a gauze or something built into one of the jets.
CB500/550 / Re: Ongoing PD46 carburettor woes (possibly)
« Last post by deltarider on Today at 09:13:23 AM »
The method itself makes sense. I recommend an analogue tachometer that shows say 40 rpm increments.
Also realise that CB500/550s with old style Keihins need a relatively rich idle to facilitate a good driveability in the lower region, at least in my experience. The K3 is a different story.
Misc / Open / Re: Finally driving again
« Last post by Andrew-S on Today at 09:12:40 AM »
Thanks again for the support folks, very much appreciated.

Get the section 88 letter from them mate
Great stuff. Chase that letter up.

Bryan & Moorey

Thanks, you prompted me to call the DVLA Drivers Medical Group again this morning - they advised me they are currently processing applications received on 2 May, mine was received on 19 May (signed proof of delivery) and reiterated that although I do not need a DVLA letter confirming I am driving under Section 88 and they do not automatically send one out they have, on my request, marked my medical case file to send me one as soon as my application case reference appears on their system.

I have rightly gone down the 'belt and braces' route and have a GP letter confirming I meet the appropriate S88 criteria and there is no medical reason to prevent me from driving; both Admiral and Footman James accepted this and have added me back on my policies as a named driver. The DVLA previously advised a GP letter is not essential or required by them and it is up to me in consultation with my GP whether I feel confident and capable to drive.

For those in a similar situation, here's a link to Section 88 - the appropriate criteria for me is on pages 2,3 and the top heading (voluntary surrender) on page 5, see:

CB500/550 / UK 500 fixer upper
« Last post by mickandsej on Today at 08:49:48 AM »
Yeah the caliper was torn right down. Put it in a box for now, more serious troubles!
Had a good day yesterday doing the wiring, decided to look at the snapped manifold studs. I was waiting to get the bike off the lift as the Dunstall pipes can’t come off whilst it’s on there (they fully wrap around the sump).
Sealey stud remover couldn’t get on the outside no4 stud but with a blow torch and lock nuts I got it off first go, so I did outside 3 stud which was snapped, same result, full of confidence I decided be sensible do all 8, first 6 were fine, inside 3 was tricky, inside 2 was really struggling. Ultimately after all the efforts that is the one that sheared just below the surface. Taking time out to think of the best solution - try and extract it or go straight to Helicoil?

Sent from my iPhone using Tapatalk
CB500/550 / Re: Ongoing PD46 carburettor woes (possibly)
« Last post by K2-K6 on Today at 08:43:35 AM »
... From a Honda manual...
What manual is that? It's probably a good method for a 2 cylinder engine. For a 4 cyl. I have my doubts...

From a CB 750 "shop manual" dated September 1970 , also still in last CB750 K8 / F2 shop manual too. Both official Honda directions for their technical support. 

It's something that's effectively been extended into most fuel injection (both diesel and petrol) systems that evolved,  ie. The individual setting of each cylinder demand by calibration of it's slow speed circuit to equal the combustion effort across all pistons.  Mostly it's done on the fly currently by monitoring the pulse time of the individual power strokes via crank sensors,  and then altering fuelling parameters for the next firing of relevant cylinder to produce smooth idle speed.

The philosophy is the same just faster and more resolved.

In the last 750 sohc manual,  it describes this routine as one done at the factory and should remain as a datum point for running the engine. It accepts that the adjustment screws don't have to be an even blanket setting to achieve combustion parity.

Essentially it's saying you can't get an accurate enough setting from the tolerances within the idle circuit just by observing the physical screw position number of turns out from base. In deferring to engine rpm it gives you what you are chasing,  even tickover and best combustion parity at that speed from a true calibration routine.  :)

It really is the icing on the cake of smooth tickover,  which is not vacuum balancing.  That doesn't have the resolution to do what this routine does. Although it is a prerequisite of this one that the carb slides are previously set correctly.

CB500/550 / Re: Ongoing PD46 carburettor woes (possibly)
« Last post by Bryanj on Today at 08:43:28 AM »
Its in the 750 F2 manual that has PD carbs, not sure about the 550 K3 supplement
CB500/550 / Re: Ongoing PD46 carburettor woes (possibly)
« Last post by deltarider on Today at 08:11:28 AM »
... From a Honda manual...
What manual is that? It's probably a good method for a 2 cylinder engine. For a 4 cyl. I have my doubts...
CB350/400 / Re: TEC shocks for '77 CB400F - SORTED
« Last post by mattsz on July 05, 2020, 11:07:29 PM »
Continuing on...

I just began the process of putting the new Tec shocks on the bike... in all my reading and research here, I've seen many recommendations for them, but never any mention of the mounting points being different widths than the original.  IF in fact my current ones are original, of course!

On my old shocks, the top eye is 22mm across (not including the rubber bushing which protrudes on both sides), and the gap between the lower "mounting fork" sides is about 19.2mm. On the new Tec shocks, the top eye is only 18.2mm across (again, rubber bushing not included), and the lower gap is 21mm.

Does this sound familiar to anyone?  I'm surprised at the difference with shocks that are supposedly direct replacement.  I guess I'll just pack the gaps with some washers?

Or, I wonder if I can switch out the tops of the shocks?  Hmm, probably not...
Misc / Open / Re: Finally driving again
« Last post by philward on July 05, 2020, 10:54:27 PM »
Thats good news Andrew - take it easy
Misc / Open / Re: Finally driving again
« Last post by Laverda Dave on July 05, 2020, 10:06:48 PM »
Well done Andrew, great news.
Just driving isn't so bad when you have a TR Triumph to drive👍.
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