1979 Triumph Bonneville 750cc, Swapping carburetors Part: 2 Amal Mk 2 Installation
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- čas přidán 2. 01. 2022
- In this video we start off by setting up the Amal Mk 2 carburetors which belong on this 1979 Triumph Bonneville. Then next we install the Amal Mk 2 carburetors on the 1979 Bonneville and finish off by putting the motorcycle back together again.
- Auta a dopravní prostředky
I can't tell you how pleased I was to find this video. It's almost as if you had made it for me! I have a 1979 T140E with a slight but sometimes annoying hesitancy when opening the throttle quickly (when the engine is hot). Pilot air screw adjustment has not solved it. I've replaced the cold start plungers (to no avail) and the next step was to replace the jets and check that I have the right throttle slide cut out. Being able to refer to your video when re-assembling so will be so helpful! Many, many thanks.
If you are talking about the new plungers that are available, well there to long, and they leak air, so that's why we went to the cable operated choke plungers,
Oh and thanks for your nice comments, also let me know if you need more help thanks,
@@jessesvintagegarage765 do you mean the OEM plungers you can get direct from Burlen (owners of Amal)?
Yes the OEM ones from AMAL they are to long
@@jessesvintagegarage765 I had a discussion with Amal's tech support about the cold start plunger length thing. They said that the first design of Mk2 plunger could wear the area above the plunger's seat into a barrel shape, causing air leaks and rough running in higher mileage bikes. As a result they redesigned the plunger in 2011 to make the plunger's head longer, giving more support to the head end to keep the plunger from wobbling about in its bore, and thereby reducing the risk of that kind of wear. My bike has a relatively low mileage thank goodness. I've had a close look and can detect no uneven wear in my plunger bores. Given how the plunger works I'm not sure I understand why a slightly longer plunger head would cause a problem with air leaking past the plunger seat - the key thing is the quality of the seat and the closeness of the plunger fit in its bore. I don't see how a slightly longer plunger would affect that? The cable version is the same length anyway - perhaps you got some new old stock?
Either way I reassembled and refitted my carbs watching your video and it was indeed of enormous help - thank you so much. Parallel inlet porting has made carb fitting a fair bit more awkward than the splayed inlets of the earlier models. I had spent some time wondering how best to synchronise Mk2s given the relative inaccessibility of the bell mouths caused by the parallel inlet design. It had never occurred to me to leave the float bowl and needle jets off and just observe the needles - inspired! Thank you again. BTW I plan to replace my float bowl screws with Allan screws to make the searching, slipping and sliding involved when screw-drivering the inner four and their rather awkward and inaccessible siting a bit easier.
I've run twin mk11 s for twenty years......I like em, only thing is make sure you get the new stayup floats so you can adjust your float level,something you can't do with the old nylon floats. Also I ended up swapping the top cap with a metal one as the cable adjusters end up being pulled through the plastic threads
Nice tutorial, there's a number of permutations of jet sizes to choose from, it would of been good to see which you had.
Nice one 👍.
Thanks for the comment, your correct there is all kinds of combinations to choose from but we used the stock US jet set.
Hi guys. Thanks for the video!! Appreciate the time/effort you put into it. Any advice on where to find/purchase the stay-up floats? I've been looking for them online but can't seem to find any. Thanks again.
Thanks for the great comment, got a couple places you can check out, Bonnevilleshop.com AMAL part # 622/069A for $46.95 or Baxtercycle.com AMAL part # 622/069A for $45.00, Its called a stay up float upgrade kit
I am looking for someone to rebuild or restore my 1979 Bonneville special
If the original bike year had Mk1 amals..DONT change to Mk2 amals...get the new redesigned .. Premium Mk1...has all the improvements you need including the material of the body is now Aluminium