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Topics - Rob.b (Rob Birkett - RIP)

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CB500/550 / CB500 Ignition Timing Puzzle with added YouTube video

« on: March 18, 2017, 12:58:56 PM »

Hi all I have just put the engine back in my bike after a major and excellent overhaul.

The first start up was a bit of a faff, before I pressed the starter I checked for spark and put in new fuel, at first all it would do is spit and fart occasionally. In the end I decided to check the timing and this is where the puzzle is, It is 180 degrees out, which I think is impossible, so I swapped the yellow and blue wires over where they connect near the battery and hey presto it runs perfectly.

I have put a vid on YouTube that shows whats going on; watch it here and sorry about the sound quality:

https://youtu.be/zJ2kpJkyeoM

Back in October when I took the motor out I decided not to disturb the electrics and they all remain as they were. Apart from the electrics behind the left hand side panel where cleaned up the contacts.

Any ideas why the points open and cylinders 1 & 4 spark when the timing marks in the auto advance unit are at the 'F' mark for 2 & 3.

Thanks for looking

Rob

Where's My Old Bike? / Who has got CB500 four Reg no XFM 460L

« on: July 30, 2016, 03:58:58 PM »

HI,

By my reckoning its 40 years today that I 'wrote off' this bike. However, it turns out its still on the database as SORN. Does it still live?

Here are a couple of photographs before I wrecked it.

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Misc / Open / Motorcycle Sales Brochures

« on: January 27, 2016, 10:46:43 AM »

Hi,

I have a large collection of bike sales brochures that may be of use or interest to those of you who are owners or restorers of bikes.

My collection is pretty complete for 1970 to 1999, and provided that the amount of work involved does not get too great I will be happy to post them up on this site probably in the gallery section.

In return if you download any of them a donation of your choice should be made toward the running of the site through the donations tab. I should point out that I have nothing to do with the running of the site and I will not benefit.

let me know what you want and I will post it up

Here is an example

CB500/550 / Honda SOHC engine rebuild

« on: January 13, 2016, 09:19:04 PM »

Hello, I'm new here.

I live in near Nantwich in Cheshire and have owned my CB500 four since 1983, it has started to smoke, it uses about 1 litre of 10/40w oil every thousand miles, although it seems to run just fine.

I replaced the valve guides about 15 years ago in the hope that would solve the issue - it didn't. It has not really matterd to me until now, but this bike is my only remaining bike and I want to start to use it as a regular (reliable) ride.

I'm not a very confident mechanic and so I was wondering if any members know of a good engineer preferably in the Northwest that could do some work; likely to be a rebore on the bike.

I have put up a Video on YouTube of the symptoms that may be of use.

Its at: https://youtu.be/awYEY3Rb7JI

Any thoughts or suggestions would be much appreciated.

Thanks Rob