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by simon.holyfield
Sun Aug 11, 2019 5:41 pm
Forum: Four stroke
Topic: Single Cylinder Ignition Timing
Replies: 9
Views: 1287

Re: Single Cylinder Ignition Timing

Thanks and good idea Chris, I'll add that in.
by simon.holyfield
Sun Aug 11, 2019 10:28 am
Forum: Four stroke
Topic: Single Cylinder Ignition Timing
Replies: 9
Views: 1287

Single Cylinder Ignition Timing

by simon.holyfield
Sat Aug 10, 2019 11:49 pm
Forum: Four stroke
Topic: Idle W/NG
Replies: 41
Views: 2764

Re: Idle W/NG

No - I can close it and if the throttle stop is high enough and the timing advanced enough it will still run. Actually it will idle pretty quickly with the throttle shut if it is advanced enough. I'm beginning to think I am chasing ghosts here. In my view, it ought to idle relatively slowly & re...
by simon.holyfield
Sat Aug 10, 2019 11:29 pm
Forum: Four stroke
Topic: Idle W/NG
Replies: 41
Views: 2764

Re: Idle W/NG

Thanks for putting that together Alan. I had a look at that today as well, and now I'm not sure if the needle really does contact the bottom of the drilling, although I'm sure it comes close. I did some measurements of port and and screw, which doesn't conclude anything; I also put some engineers bl...
by simon.holyfield
Sat Aug 10, 2019 10:30 am
Forum: Four stroke
Topic: Idle W/NG
Replies: 41
Views: 2764

Re: Idle W/NG

Screenshot_20190810_003656_com.android.chrome.jpg I am harbouring a fanciful notion that this Amal air screw has a shorter taper than the one I have fitted. IMG_20190809_161602.jpg I'm wondering if my air screw bottoms out against the brass plug and does not meter properly. Adding to this thought i...
by simon.holyfield
Fri Aug 09, 2019 7:28 pm
Forum: Four stroke
Topic: Idle W/NG
Replies: 41
Views: 2764

Re: Idle W/NG

You've probably read all this but Hitchcocks have some great info re the premonobloc carb here http://accessories.hitchcocksmotorcycles.com/Amal-Carburettors/Amal-Pre-Monobloc-Hints-and-Tips/How-to-Trace-Faults-Pre-Monobloc Banging in the exhaust... I wonder if the pilot air screw is too far open.
by simon.holyfield
Fri Aug 09, 2019 5:25 pm
Forum: Four stroke
Topic: Idle W/NG
Replies: 41
Views: 2764

Re: Idle W/NG

You've probably read all this but Hitchcocks have some great info re the premonobloc carb here http://accessories.hitchcocksmotorcycles.com/Amal-Carburettors/Amal-Pre-Monobloc-Hints-and-Tips/How-to-Trace-Faults-Pre-Monobloc I haven't seen that, I will have a read. Currently the pilot air system &am...
by simon.holyfield
Fri Aug 09, 2019 5:22 pm
Forum: Four stroke
Topic: Idle W/NG
Replies: 41
Views: 2764

Re: Idle W/NG

IMG_20190809_161613.jpg


My bottom nut & screws...
by simon.holyfield
Fri Aug 09, 2019 4:47 pm
Forum: Four stroke
Topic: Idle W/NG
Replies: 41
Views: 2764

Re: Idle W/NG

Simon, have you checked the fuel level as suggested, this will tell you if the jet block nuts is correct and also the fuel level which, if wrong, will effect the idle. To a point yes, but I have not had time to make a fitting to go onto the drain port - do you happen to know what thread it is? I mi...
by simon.holyfield
Fri Aug 09, 2019 2:03 pm
Forum: Four stroke
Topic: Idle W/NG
Replies: 41
Views: 2764

Re: Idle W/NG

Looking at the Amal book, it looks like there are two jet block nuts listed for the 276 (6/062 and 6/033), but only one for the 275 (4/062).

I guess I must have the right one.

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