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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
MK 1 concentrics
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<blockquote data-quote="vibrac" data-source="post: 110679" data-attributes="member: 60"><p>Now I am no expert on these items TT ,GP, Monblocks, Mikuni Perhaps, but these.... However a mate of mine has a strange problem with a pair of these carbs. They were on the bike and working before it was in storage. They are on the bike and have been ultrasonically cleaned and the settings pilot etc are the same and importantly the slides are absolutely lifting in unison. I can see no leaks in the inlet system. The electrical system is OK the plugs sparks and have been swaped about and she starts OK however on tickover only the front pot runs untill about 1500 revs when the rear chimes in. Playing about with the pilot settings brings no joy and has been returned to the same as the front as original.</p><p>Now here is the strange bit which I am hoping will indicate to those who know what is the problem. On the front of the carb under the carb inlet are 3 small holes two smaller each side of the central larger one I guess they are part of the pilot system if I the engine is ticking over with the front lugging round the rear and I put a finger over this hole nothing changes but when I remove my finger after a couple of revs the rear chimes in and runs clean for a couple of seconds and dies again, this finger action can be repeated. it indicates fuel starvation but where? So concentric guys whats that finger fiddle indicate is wrong?</p></blockquote><p></p>
[QUOTE="vibrac, post: 110679, member: 60"] Now I am no expert on these items TT ,GP, Monblocks, Mikuni Perhaps, but these.... However a mate of mine has a strange problem with a pair of these carbs. They were on the bike and working before it was in storage. They are on the bike and have been ultrasonically cleaned and the settings pilot etc are the same and importantly the slides are absolutely lifting in unison. I can see no leaks in the inlet system. The electrical system is OK the plugs sparks and have been swaped about and she starts OK however on tickover only the front pot runs untill about 1500 revs when the rear chimes in. Playing about with the pilot settings brings no joy and has been returned to the same as the front as original. Now here is the strange bit which I am hoping will indicate to those who know what is the problem. On the front of the carb under the carb inlet are 3 small holes two smaller each side of the central larger one I guess they are part of the pilot system if I the engine is ticking over with the front lugging round the rear and I put a finger over this hole nothing changes but when I remove my finger after a couple of revs the rear chimes in and runs clean for a couple of seconds and dies again, this finger action can be repeated. it indicates fuel starvation but where? So concentric guys whats that finger fiddle indicate is wrong? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
MK 1 concentrics
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