On or around Fri, 12 Mar 2010 14:53:36 +0000, Mike Buckley
<(E-Mail Removed)> enlightened us thusly:

>Moved under its own power for the first time in at least 25 years:
>
>http://www.flickr.com/photos/3966580...7622501687588/
>


bloody hell, you've dnoe a nice job on that. Looks better than new!

In message <(E-Mail Removed)>, Austin Shackles
<(E-Mail Removed)> writes
>On or around Fri, 12 Mar 2010 14:53:36 +0000, Mike Buckley
><(E-Mail Removed)> enlightened us thusly:
>
>>Moved under its own power for the first time in at least 25 years:
>>
>>http://www.flickr.com/photos/3966580...7622501687588/
>>
>
>
>bloody hell, you've dnoe a nice job on that. Looks better than new!

Wish it ran like it. Hopefully new genuine pilot jet arrives tomorrow.

--
Mike Buckley
RD350LC2
CB72

In message <(E-Mail Removed)>, Mike Buckley
<(E-Mail Removed)> writes
>In message <(E-Mail Removed)>, Austin
>Shackles <(E-Mail Removed)> writes
>>On or around Fri, 12 Mar 2010 14:53:36 +0000, Mike Buckley
>><(E-Mail Removed)> enlightened us thusly:
>>
>>>Moved under its own power for the first time in at least 25 years:
>>>
>>>http://www.flickr.com/photos/3966580...set-7215762250
>>>1687588/
>>>
>>
>>
>>bloody hell, you've dnoe a nice job on that. Looks better than new!
>
>Wish it ran like it. Hopefully new genuine pilot jet arrives tomorrow.
>

Bad form etc. The pilot jet fixed the idle problem but can anybody
explain when ignition advance should kick in? The CB has a spring
mechanism on the cam shaft which advances the ignition, on mine it
appears to be advancing as soon as you open the throttle, I thought
advance happened higher up the rev range?

--
Mike Buckley
RD350LC2
CB72

Using the patented Mavis Beacon "Hunt&Peck" Technique, Mike Buckley
<(E-Mail Removed)> typed
>In message <(E-Mail Removed)>, Mike Buckley
><(E-Mail Removed)> writes
>>In message <(E-Mail Removed)>, Austin
>>Shackles <(E-Mail Removed)> writes
>>>On or around Fri, 12 Mar 2010 14:53:36 +0000, Mike Buckley
>>><(E-Mail Removed)> enlightened us thusly:
>>>
>>>>Moved under its own power for the first time in at least 25 years:
>>>>
>>>>http://www.flickr.com/photos/3966580...set-7215762250
>>>>1687588/
>>>>
>>>
>>>
>>>bloody hell, you've dnoe a nice job on that. Looks better than new!
>>
>>Wish it ran like it. Hopefully new genuine pilot jet arrives tomorrow.
>>
>
>Bad form etc. The pilot jet fixed the idle problem but can anybody
>explain when ignition advance should kick in? The CB has a spring
>mechanism on the cam shaft which advances the ignition, on mine it
>appears to be advancing as soon as you open the throttle, I thought
>advance happened higher up the rev range?

This is the bit where I say:

"**** originality, Boyer Bransden are your friends".

Seriously, springs? **** that. Put them away in a box, so you can pass
them on if you sell it.

--
Wicked Uncle Nigel - "He's hopeless, but he's honest"

I've always been a man who's open to persuasion

Mike Buckley <(E-Mail Removed)> wrote:
>
> Bad form etc. The pilot jet fixed the idle problem but can anybody
> explain when ignition advance should kick in? The CB has a spring
> mechanism on the cam shaft which advances the ignition, on mine it
> appears to be advancing as soon as you open the throttle, I thought
> advance happened higher up the rev range?

What are you using to test it, this does not sound right.
You need a proper strobe timing light, there will be timing marks ISTR
under a cover on the LHS but ICBW.
Do you have a Haynes or similar BOL ?.

--
03 GS500K2
76 Honda 400/4 project
68 Bantam D14/4 Sport (Classic)
06 Sukida SK50QT (Slanty eyed shopping trolley)

Mike Buckley <(E-Mail Removed)> wrote:

> Bad form etc. The pilot jet fixed the idle problem but can anybody
> explain when ignition advance should kick in? The CB has a spring
> mechanism on the cam shaft which advances the ignition, on mine it
> appears to be advancing as soon as you open the throttle, I thought
> advance happened higher up the rev range?

Yours is doing what it's supposed to do. It's springs: the moment the AA
plate starts twirling, centrifugal force is going to start stretcvhing
them.

It's a very crude system. But it works.


--
BMW K1100LT Ducati 750SS Honda CB400F Triumph Street Triple
Suzuki TS250ER GN250 Damn, back to six bikes!
Try Googling before asking a damn silly question.
chateau dot murray at idnet dot com

In message <hnuoa6$u4b$(E-Mail Removed)>, (E-Mail Removed)
writes
>Mike Buckley <(E-Mail Removed)> wrote:
>>
>> Bad form etc. The pilot jet fixed the idle problem but can anybody
>> explain when ignition advance should kick in? The CB has a spring
>> mechanism on the cam shaft which advances the ignition, on mine it
>> appears to be advancing as soon as you open the throttle, I thought
>> advance happened higher up the rev range?
>
>What are you using to test it, this does not sound right.
>You need a proper strobe timing light, there will be timing marks ISTR
>under a cover on the LHS but ICBW.
>Do you have a Haynes or similar BOL ?.
>

I have a proper strobe light (tenner from Amazon), and it shows my
static timing was pretty much spot on, but the slightest rev increase
and it advances quite a lot. Weak advance springs seem to be a bit of a
problem on these. They can be replaced, possibly without removing the
camshaft, but even so the engine has to be dropped in the frame.

Electronic ignition is available (for about $300!!) but it still relies
on the mechanical advance on the camshaft, so in this case I might get
some benefits but not really the one I'm most after. They also recommend
going to Dyna coils at the same time, so even more expense.


I'll see how it goes on the road before deciding what to do.

--
Mike Buckley
RD350LC2
CB72

In message <(E-Mail Removed)>, Mike Buckley
<(E-Mail Removed)> writes
>In message <(E-Mail Removed)>, Mike Buckley
><(E-Mail Removed)> writes
>>In message <(E-Mail Removed)>, Austin
>>Shackles <(E-Mail Removed)> writes
>>>On or around Fri, 12 Mar 2010 14:53:36 +0000, Mike Buckley
>>><(E-Mail Removed)> enlightened us thusly:
>>>
>>>>Moved under its own power for the first time in at least 25 years:
>>>>
>>>>http://www.flickr.com/photos/3966580...set-7215762250
>>>>1687588/
>>>>
>>>
>>>
>>>bloody hell, you've dnoe a nice job on that. Looks better than new!
>>
>>Wish it ran like it. Hopefully new genuine pilot jet arrives tomorrow.
>>
>
>Bad form etc. The pilot jet fixed the idle problem but can anybody
>explain when ignition advance should kick in? The CB has a spring
>mechanism on the cam shaft which advances the ignition, on mine it
>appears to be advancing as soon as you open the throttle, I thought
>advance happened higher up the rev range?
>
If it's the same as on my old CB250-K4 then the spring has weakened and
the cam is going to full adjust too early. There were a pair of springs
on my one.
--
Tim

In message <(E-Mail Removed)>, Mike Buckley
<(E-Mail Removed)> writes
>In message <hnuoa6$u4b$(E-Mail Removed)>, (E-Mail Removed)
>writes
>>Mike Buckley <(E-Mail Removed)> wrote:
>>>
>>> Bad form etc. The pilot jet fixed the idle problem but can anybody
>>> explain when ignition advance should kick in? The CB has a spring
>>> mechanism on the cam shaft which advances the ignition, on mine it
>>> appears to be advancing as soon as you open the throttle, I thought
>>> advance happened higher up the rev range?
>>
>>What are you using to test it, this does not sound right.
>>You need a proper strobe timing light, there will be timing marks ISTR
>>under a cover on the LHS but ICBW.
>>Do you have a Haynes or similar BOL ?.
>>
>
>I have a proper strobe light (tenner from Amazon), and it shows my
>static timing was pretty much spot on, but the slightest rev increase
>and it advances quite a lot. Weak advance springs seem to be a bit of a
>problem on these. They can be replaced, possibly without removing the
>camshaft, but even so the engine has to be dropped in the frame.
>
Drop the engine just to reach the timing adjust springs? Yeuk. On the K4
they were under a nice shiny cover held by two 8mm bolts.
--
Tim

Mike Buckley <(E-Mail Removed)> wrote:
>
> I have a proper strobe light (tenner from Amazon), and it shows my
> static timing was pretty much spot on, but the slightest rev increase
> and it advances quite a lot. Weak advance springs seem to be a bit of a
> problem on these. They can be replaced, possibly without removing the
> camshaft, but even so the engine has to be dropped in the frame.

It should be on the static marks at tickover and then advance progressively,
reaching the full advance marks at typically around 2800 rpm [1].

> I'll see how it goes on the road before deciding what to do.

If is advances too early it will lack torque at low rpm for pulling away.

[1] 2800 is from memory, RTFM if you have one, someone will doubtless
tell me that I have it rong <B-).

--
03 GS500K2
76 Honda 400/4 project
68 Bantam D14/4 Sport (Classic)
06 Sukida SK50QT (Slanty eyed shopping trolley)