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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Need Advice, can't keep an idle (intermittently) approaching or at a stop with New Amal 276's
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<blockquote data-quote="greg brillus" data-source="post: 132519" data-attributes="member: 597"><p>The trick to tuning an engine for idle speed and mixture is for the engine to be at a nice temperature, neither cold or too hot........You should start the engine and ride the bike not more than 3 to 4 km's around the block, then return to the workshop and get to work quickly.........If the engine is quite warm it is a good idea to have a good sized electric fan at the ready to help keep some air flow over the engine. It pays to keep the bike as upright as possible as well, especially with the original side bowl carby's as these will give a poor reading of the engine if a side stand is used. If you have all the correct tools at the ready, and preferably sat on a stool or low bench very nearby, this helps very much........An engine that starts and runs quite well from cold with no spit backs when the throttle is opened quite quickly is a general indication that the mixture is probably on the rich side.......this is not a bad thing, but it could cause sooting of the plugs.......Despite the differences from modern fuels to old leaded fuels, you can actually get quite good plug readings......You really want the outer steel ring/body to show a light sooty black appearance, with the center electrode area a tan/grey sort of color........If the plug total area is very sooty black, then the mixture is too rich........this is probably an issue with too small a slide cut away, or else the fuel height is too high........Worn needle jets can cause this too, and they don't need to have much wear to cause a rich mixture.........needles themselves actually don't wear much at all, suffering more from mechanical damage if the needle is allowed to pass down the wrong hole in the top of the jet block, the grooves do wear over time as well. Plugs that are oily wet are a sure sign of excess wear in the guides or mechanical failure of the guide and its lock rings, another very common cause for oil on plugs is the oil feed at the rear of the liner is too high in relation to the piston rings, thus feeding oil within the rings, this was a problem right from the factory from what I have seen........Right'o its time for a cuppa tea...........Cheers.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 132519, member: 597"] The trick to tuning an engine for idle speed and mixture is for the engine to be at a nice temperature, neither cold or too hot........You should start the engine and ride the bike not more than 3 to 4 km's around the block, then return to the workshop and get to work quickly.........If the engine is quite warm it is a good idea to have a good sized electric fan at the ready to help keep some air flow over the engine. It pays to keep the bike as upright as possible as well, especially with the original side bowl carby's as these will give a poor reading of the engine if a side stand is used. If you have all the correct tools at the ready, and preferably sat on a stool or low bench very nearby, this helps very much........An engine that starts and runs quite well from cold with no spit backs when the throttle is opened quite quickly is a general indication that the mixture is probably on the rich side.......this is not a bad thing, but it could cause sooting of the plugs.......Despite the differences from modern fuels to old leaded fuels, you can actually get quite good plug readings......You really want the outer steel ring/body to show a light sooty black appearance, with the center electrode area a tan/grey sort of color........If the plug total area is very sooty black, then the mixture is too rich........this is probably an issue with too small a slide cut away, or else the fuel height is too high........Worn needle jets can cause this too, and they don't need to have much wear to cause a rich mixture.........needles themselves actually don't wear much at all, suffering more from mechanical damage if the needle is allowed to pass down the wrong hole in the top of the jet block, the grooves do wear over time as well. Plugs that are oily wet are a sure sign of excess wear in the guides or mechanical failure of the guide and its lock rings, another very common cause for oil on plugs is the oil feed at the rear of the liner is too high in relation to the piston rings, thus feeding oil within the rings, this was a problem right from the factory from what I have seen........Right'o its time for a cuppa tea...........Cheers. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Need Advice, can't keep an idle (intermittently) approaching or at a stop with New Amal 276's
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