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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
289 carb settings
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<blockquote data-quote="Simon Dinsdale" data-source="post: 40955" data-attributes="member: 58"><p><strong>289 jetblock fit to body</strong></p><p></p><p>Another thing to look for on 289 type carbs is the fit of the jetblock in the body. It should be tight.</p><p></p><p>The idle circuit goes via the tickover adjust screw and through the body into the jetblock. If the jetblock is not round and a good fit into the body especially where the idle circuit holes are, air or fuel can leak around this area inside the body and cause starting / tickover problems. If your engine does not respond very well to tickover mixture adjustment setup and is not a easy starter (assuming everything else is ok) this is usually where the problem is.</p><p></p><p>I have a front carb which suffered this problem and in the end I replaced it. It was very difficult to measure if it was the body or jetblock that was the problem.</p><p>The only solution to this problem I can see is to replace the jetblock with a slightly oversize one to get the tight fit back or to sleeve the body to a tight fit with the jetblock. Unfortunately such jetblocks are not available so its make your own which is not easy. Sleeving the body to fit the jetblock could cause problems with the throttle slide.</p><p></p><p>Has anybody come up with a solution to this problem? (apart from buy a new carb).</p><p></p><p>Cheers</p><p>Simon</p></blockquote><p></p>
[QUOTE="Simon Dinsdale, post: 40955, member: 58"] [b]289 jetblock fit to body[/b] Another thing to look for on 289 type carbs is the fit of the jetblock in the body. It should be tight. The idle circuit goes via the tickover adjust screw and through the body into the jetblock. If the jetblock is not round and a good fit into the body especially where the idle circuit holes are, air or fuel can leak around this area inside the body and cause starting / tickover problems. If your engine does not respond very well to tickover mixture adjustment setup and is not a easy starter (assuming everything else is ok) this is usually where the problem is. I have a front carb which suffered this problem and in the end I replaced it. It was very difficult to measure if it was the body or jetblock that was the problem. The only solution to this problem I can see is to replace the jetblock with a slightly oversize one to get the tight fit back or to sleeve the body to a tight fit with the jetblock. Unfortunately such jetblocks are not available so its make your own which is not easy. Sleeving the body to fit the jetblock could cause problems with the throttle slide. Has anybody come up with a solution to this problem? (apart from buy a new carb). Cheers Simon [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
289 carb settings
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