mbdean Posted September 30, 2003 Share Posted September 30, 2003 When I first installed my Dynojet kit last spring I thought it was a bit lean. Basically, there was a flat spot between 3500-5000 rpms - after that it accelerates very strongly. This flat spot, as I call it, was almost a "sputtering", but not quite. Anyway, I raised the needles a notch and thought that fixed it. However, at the same time warm spring weather suddenly started - "suddenly", as it does in the mountains. Regardless of the reason, the problem was fixed. However, in the last couple weeks cold weather has returned - and so has the flat spot. My questions are these: 1. Have any of you 97 or 98 owners who have installed jet kits seen this problem? 2. My diagnosis is that the bike is running lean. In warm weather - with the air less dense - the problem goes away. But in cooler weather it returns. Any thoughts or disagreements with this diagnosis? 3. Anyone have a different diagnosis? 4. Hey Pace! As another carburated Blackbird owner living and riding at high altitude, have you seen this problem? Anyway, looking forward to your responses, and "Happy Riding" to all! Quote Link to comment Share on other sites More sharing options...
CBRXX Posted September 30, 2003 Share Posted September 30, 2003 If I recall from dirt bikes, I think you're right. The cold air leans it out. Quote Link to comment Share on other sites More sharing options...
Pete in PA Posted October 3, 2003 Share Posted October 3, 2003 Cold air going in doesn't allow the fuel to atomize as quickly(remains in larger drops) so it leans out the mixture. Cold air is actually more dense. When it drops below 45 deg. F. my bike gets a hesitation when you whack the throttle wide open at 3500 rpm. Quote Link to comment Share on other sites More sharing options...
JJP XX Posted October 6, 2003 Share Posted October 6, 2003 My bike is totally stock. OEM everything except for comfort items. I never had a ridability problem with it from 30 degrees to 105 degrees, from sea level to 5000 feet. And 74 k miles too. Probably a Wednesday vehicle.... :grin: Quote Link to comment Share on other sites More sharing options...
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