alta Posted December 26, 2015 Report Share Posted December 26, 2015 Has anyone used the new 20mm Amal on a standard capacity Tiger Cub motor? How does it perform, particularly on a "snap" throttle opening off low revs? Is it as good as the cheap "pit bike" Mikuni type carbs? Comments appreciated. Cheers. Quote Link to comment Share on other sites More sharing options...
totalshell Posted December 27, 2015 Report Share Posted December 27, 2015 lot of folks in yarkshire will be abe to give you an answer soon as foriegn carbs have been banned from 2017 1 Quote Link to comment Share on other sites More sharing options...
totalshell Posted December 27, 2015 Report Share Posted December 27, 2015 lot of folks in yarkshire will be abe to give you an answer soon as foriegn carbs have been banned from 2017 Quote Link to comment Share on other sites More sharing options...
2stroke4stroke Posted December 27, 2015 Report Share Posted December 27, 2015 No old Spanish Amals then? Quote Link to comment Share on other sites More sharing options...
collyolly Posted December 27, 2015 Report Share Posted December 27, 2015 I think the whole point of the exercise is to bring in to line the use of 'British style' carbs on the pre 65 bikes even though the concentric carb was not available pre 65 ! This is possible now that a 20mm version is available, I don't think the Spanish made a 4 stroke version of a 20mm carb or even a 20mm one at all. 1 Quote Link to comment Share on other sites More sharing options...
alta Posted December 28, 2015 Author Report Share Posted December 28, 2015 It's not currently listed in their carburetter settings and spare parts booklet but is apparently supplied with a number 3 slide, 100 main, 106 needle and premier pilot jets and is not mentioned as being specific to a Cub. Quote Link to comment Share on other sites More sharing options...
laird387 Posted December 28, 2015 Report Share Posted December 28, 2015 Hi, The prime jetting and slide details are usually specific to a choke size, to give the correct basic volumetric mixture to create a reasonably combustible mixture, the choke size is therefore set by the engine manufacturer and the assumption made that any basic carburettor of the correct choke size can be fine tuned by adjustment of pilot jet and needle jet. Quote Link to comment Share on other sites More sharing options...
charlie prescott Posted December 29, 2015 Report Share Posted December 29, 2015 Hi Guy's, Hi Deryk, Been doing homework all-day on the concentric carb and its problems. And the more I delve the more I find that this carburettor is not as simple as it seems. It has a lot more problems than you would think. And I can now see why they have started to manufacture it in aluminium, So if you are thinking of buying one of these carburettors, buy the aluminium version even if it is more expensive. The pilot jet with todays fuels is the main problem, but I think Burlen have now sorted this with a new system, or at least revised. Regards Charlie. Quote Link to comment Share on other sites More sharing options...
alta Posted December 29, 2015 Author Report Share Posted December 29, 2015 Interesting reading. With reference to Charlie's post, hopefully Burlen have sorted any issues, however until an independent body confirms that they have, I'm lacking the confidence to buy one. Maybe it's a bit too soon for any feedback. Quote Link to comment Share on other sites More sharing options...
totalshell Posted December 30, 2015 Report Share Posted December 30, 2015 cubs have been ridden for years elsewhere with brit carbs they dont seem to all struggle.. not that long ago one won the pre65 ssdt.. 1 Quote Link to comment Share on other sites More sharing options...
charlie prescott Posted December 30, 2015 Report Share Posted December 30, 2015 Hi Guy's. Hi TS. I seem to remember one of the Cubs that won the Scottish two day trial was sporting a Villiers, Carburettor. I can't remember what the Paul Heys bike used though. Regards Charlie. Quote Link to comment Share on other sites More sharing options...
alta Posted December 30, 2015 Author Report Share Posted December 30, 2015 Chances are that they were not 199's, so therefore wouldn't tend to suffer so much from the "gasping" off low revs,if given a handful of throttle. Quote Link to comment Share on other sites More sharing options...
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