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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Series ‘A’ Twin Carburetion
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<blockquote data-quote="greg brillus" data-source="post: 101645" data-attributes="member: 597"><p>Thanks for the replies ......... It's a tricky one, I'm thinking that perhaps it is rich causing the plugs (NGK B5 or 6 ES) that may be fouling and causing the rough running. I might experiment around some more. It is worth noting that the originals ran 276 carbs that have quite a different air flow versus the 289's which are much bigger, and also on the originals that the front carb ran a number 3 slide. That would indicate to me that they were trying to help get more fuel delivery, perhaps due to the horizontal carb body that relies more in drawing the fuel from the float versus the vertical type where the fuel sits more upward on the mixing chamber. Just for a bit of info .............. I gave the bike a run the other day of around 15 km's, came home and parked the bike up for 10 minutes, I then checked each carby for temperature with my digital temp gun and the rear float was about 40 degrees Celcius and the front one was about 75 to 80 degrees .......... so you can see the front suffers from heat soak big time versus the rear one.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 101645, member: 597"] Thanks for the replies ......... It's a tricky one, I'm thinking that perhaps it is rich causing the plugs (NGK B5 or 6 ES) that may be fouling and causing the rough running. I might experiment around some more. It is worth noting that the originals ran 276 carbs that have quite a different air flow versus the 289's which are much bigger, and also on the originals that the front carb ran a number 3 slide. That would indicate to me that they were trying to help get more fuel delivery, perhaps due to the horizontal carb body that relies more in drawing the fuel from the float versus the vertical type where the fuel sits more upward on the mixing chamber. Just for a bit of info .............. I gave the bike a run the other day of around 15 km's, came home and parked the bike up for 10 minutes, I then checked each carby for temperature with my digital temp gun and the rear float was about 40 degrees Celcius and the front one was about 75 to 80 degrees .......... so you can see the front suffers from heat soak big time versus the rear one. [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Series ‘A’ Twin Carburetion
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