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by Mick D
Tue Aug 13, 2019 8:26 am
Forum: Four stroke
Topic: GB Gearbox
Replies: 5
Views: 1130

Re: GB Gearbox

I am given to understand that i can (if i am lucky or very lucky ) remove the gearbox outercover , undo the nut on the end of the main shaft and carefully withdraw the shaft replacing it with a suitable rod Hi This is not possible unless you take off the inner cover which houses the kick start side...
by Mick D
Sun Aug 11, 2019 7:54 pm
Forum: Four stroke
Topic: Single Cylinder Ignition Timing
Replies: 9
Views: 1592

Re: Single Cylinder Ignition Timing

Hi

The DI is far more accurate than a 'stick' and to establish TDC my procedure is to determine a point either side of TDC and bisect the angle - this is not subject to the direct measurement errors you correctly identify.

How does the 'hard stop' work?

Regards Mick
by Mick D
Sun Aug 11, 2019 6:40 pm
Forum: Four stroke
Topic: Single Cylinder Ignition Timing
Replies: 9
Views: 1592

Re: Single Cylinder Ignition Timing

Hi

I use this to locate TDC and a timing disc to establish crank position - minimises the 'ineffective crank angle' error
TDC.png
TDC.png (319.1 KiB) Viewed 1521 times

Regards Mick
by Mick D
Fri Aug 09, 2019 5:34 am
Forum: Four stroke
Topic: spanner or socket
Replies: 10
Views: 1512

Re: spanner or socket

Hi It's worth bearing in mind the access to this nut: It's recessed into the sprocket, (this is compounded if you use the secondary chain as a means to restrain rotation during removal / installation). If you have a FERC configured bike the forward section of the FERC has to be installed before the ...
by Mick D
Thu Aug 08, 2019 12:04 pm
Forum: Four stroke
Topic: Idle W/NG
Replies: 41
Views: 3541

Re: Idle W/NG

simon.holyfield wrote:Any idea which one I am supposed to have for that 275?


Hi

If you weren't already aware, you can download the complete 2018 version of the Amal catalogue from here:

http://amalcarb.co.uk/books-catalogues.html

It's full of excellent info

Regards Mick
by Mick D
Wed Aug 07, 2019 11:47 am
Forum: Four stroke
Topic: Idle W/NG
Replies: 41
Views: 3541

Re: Idle W/NG

Hi

I'd be tempted to increase the idle mixture strength and adjust the revs back down with the throttle stop - sounds like it's a bit weak.

Regards Mick
by Mick D
Thu Aug 01, 2019 5:31 pm
Forum: Four stroke
Topic: 1938 ARIEL SQUARE FOUR CLUTCH PUSH ROD
Replies: 7
Views: 752

Re: 1938 ARIEL SQUARE FOUR CLUTCH PUSH ROD

Hi

With Draganfly not listing anything even close to your dimension I'd be checking the clutch for conformity with the original design. A missing ball bearing if applicable would only account for 5/16"

Regards Mick
by Mick D
Tue Jul 30, 2019 7:45 pm
Forum: Four stroke
Topic: spanner or socket
Replies: 10
Views: 1512

Re: spanner or socket

I refer you to my previous post - measure your nut and look up the tables.

My nut came from a 54 GB6 box and is now fitted to a 58GB44 one - it's 1" W.

Regards Mick
by Mick D
Tue Jul 30, 2019 7:02 am
Forum: Four stroke
Topic: spanner or socket
Replies: 10
Views: 1512

Re: spanner or socket

Hi

It's 1" Whitworth - I bought a box spanner from here, very pleased with it:

https://www.ffx.co.uk/tools/product/Mel ... -X-1-X-7In

Regards Mick
by Mick D
Wed Jul 24, 2019 3:33 pm
Forum: Four stroke
Topic: Cush Drive Spacer Dimensions
Replies: 0
Views: 907

Cush Drive Spacer Dimensions

Hi My efforts to return my 58 FH primary drive to original continue, when I bought the bike it had a GB6 gearbox installed and consequently the wrong length main shaft, (confirmed). It also had a 25T engine sprocket, the parentage of which I was unable to determine. I've now replaced the GB6 with, w...

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