Recent posts

#91
Technical Discussion Forum / Re: AMAC 15 PJY
Last post by singleminded - September 25, 2023, 03:35:50 PM
If you think that the float may be a bit high try rotating the carb on the stub  anti clockwise if the chamber is on the left of the carb, or clockwise if on the right. If your float chamber is a bottom feed type it may be worth taking the lid of to make sure the float is actually floating and not getting stuck. I'm not really knowledgeable on AMAC carbs but this is general testing.
John
#92
Technical Discussion Forum / Re: AMAC 15 PJY
Last post by Russ - September 25, 2023, 07:20:12 AM
Nope not sorted.....it leaks like a sieve.....it seems to be leaking from the small hole at the back of the carb adjacent the mixture adjuster screw is......I'm wondering if it's something to do with the float bowl  / needle or maybe there something missing......any thoughts  / ideas welcome
#93
Technical Discussion Forum / Re: AMAC 15 PJY
Last post by Russ - September 23, 2023, 07:07:09 PM
sorted now I made my own copper washer about a third the width of the one in the photo......
#94
Technical Discussion Forum / AMAC 15 PJY
Last post by Russ - September 23, 2023, 11:03:02 AM
quick question chaps.....who is running an AMAC 15 PJY......do you have the copper washer installed between the jet body and the carb body? as listed in the AMAC parts list pt no 3039 see attached photo....note the small hole in the recess....the copper washer will slightly cover this is this a problem.....JTC says to leave it out which is what I think I'm going to do....I just wonder why AMAC would list a copper washer if it wasn't needed....I'm wondering if it's more like a shim to raise the jet body  / jet away from the sprayer nozzle or whether it's actually just a seal or perhaps it does both jobs......your thoughts would be appreciated......cheers
#95
Technical Discussion Forum / difficult starting Longstroke
Last post by Frank Nield - September 19, 2023, 03:47:54 PM
1926 Longstroke with AMAC Type 15 HYDM carb. Big fat spark but no petrol getting through onto plug. Tappets ok. Will go sometimes with  drop of petrol poured in. Backfire usually precedes engine starting. Once it's going, it will go for ever, and will tick over perfectly. Currently have carb off for a thorough cleaning. Am I missing something obvious? I'm not an engineer and have done several Banbury runs on this bike with no bother. Any suggestions welcome!
#96
Technical Discussion Forum / Re: Girder link nut
Last post by Thomas - September 19, 2023, 02:42:37 PM
Yes, there are also adjusting nuts behind the girder links. The girder link nuts are ½ inch 20 tpi BSC (british standard cycle). I have gotten two of them from Motalia today. The Motalia part number is NCL12020. However, they are 7.8mm thick instead of the original 5.4mm. One can make them thinner on the lathe but that's not really necessary.
#97
Technical Discussion Forum / Re: How does it work
Last post by Russ - September 18, 2023, 02:02:47 PM
Sorted now.....thanks all
#98
Technical Discussion Forum / Re: Oil
Last post by Russ - September 18, 2023, 02:02:19 PM
Sorted now...thanks all
#99
Technical Discussion Forum / Re: Paper Gaskets
Last post by Russ - September 18, 2023, 02:01:55 PM
Sorted ..thanks all
#100
Technical Discussion Forum / Re: Oil
Last post by Thomas - September 16, 2023, 09:20:12 PM
No problem, Russ, as long as you don't run it at very high summer temperatures. Leave it in until the next change. It is dificult to judge, anyway, because those machines were used at daily life and never had been taken care for as we do it today.