Alex. Posted May 20, 2013 Report Share Posted May 20, 2013 Hi Guys, I'm currently building a Cafe Racer from a 1989 Yam XJ600, using pod filters. Performance is not the driving factor, as I have other bikes that are much faster than an XJ could ever be! The pods just fit with the look of the bike. I know that the carb settings will need to change, but what would be a good baseline to start from? The standard spec for the Mikuni BS32 carbs is:- Main Jet - 105 Pilot Jet - 40 Main Air Jet - 70 Jet Needle Clip - 3 (although I do not remember the clip being adjustable on the needle) Needle Jet - N-8 Any help would be greatly appreciated, I'm getting close to the end of the initial build! Alex. Link to comment Share on other sites More sharing options...
Kayla Posted May 20, 2013 Report Share Posted May 20, 2013 We did a ropey XJ550 a year or so ago and fitted foam pods to it (not those awful chrome capped mesh ones!) and ended up just raising the needles by a notch. That cleaned it up enough to make it rideable* and it sounded pretty good. It's a cheap (free!) fix and will give you a decent starting point. You might end up needing to bugger about with the main jet size but I wouldn't (personally) bother messing around with much else. * 'rideable' as in 'no gaping flat spots needing tons of clutch slip to pull away' Link to comment Share on other sites More sharing options...
banoffee Posted May 20, 2013 Report Share Posted May 20, 2013 Sometimes worth a look on http://www.dynojet.com/jetkits/motorcycle/ and read the PDF for yours/similar bikes to get an idea of the mains used. DJ mains are slightly different in size to others 'number for number' however gives you an idea to start. Link to comment Share on other sites More sharing options...
dodgy_tom Posted May 21, 2013 Report Share Posted May 21, 2013 I would lift the needles a notch to begin with. If there are no notches then get 4 M4 flat washers and put them under the top of the needles where they come through the diaphragm. One on each carb... I'd also probably go to 115 as a starting point on the mains ideally. Maybe also consider a 45 pilot jet? CV carbs aren't ideal to run with pod filters so you will always find a flat spot or imperfect fuelling somewhere. Link to comment Share on other sites More sharing options...
Alex. Posted May 21, 2013 Author Report Share Posted May 21, 2013 Thanks guys, I'll lift the needles and see about some jets. Can't wait to get her on he road! Alex. Link to comment Share on other sites More sharing options...
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