I've had my '85 CB450SCL now for about 3 years - awesome little bike, but ever since day 1 I can't get the carbs (VB22's) dialed in just right. Maybe it's not even the carbs, who knows.
The problem I'm having is that down on low load it's quite weak (not weak enough to stall, but weak enough that it def. doesn't feel right, as if it has maybe half the power it should). As soon as I get passed like ~30%-40% throttle (when I'm assuming the slides start moving up and the main jet starts going) it runs fine - has the right power it should. Even if you rev at idle it sounds as if the engine is weak until you get passed that "throttle threshold." I figured maybe the slight exhaust leaks or air box boots not 100% sealing which is inevitable on a bike this old is causing it to lean out, I stepped the slow jet from a #38 to a #40, no noticeable change. I have some #42's too which I'll try soon, but I'm not expecting much difference. Carbs have been cleaned and rebuilt countless times, between this and my CM I've been through these carbs more times than I can count - including once by an 'ol Honda twin pro friend - I'm having this same exact problem with my CM450E, btw, so I feel this should be at least a relatively common problem with the 450's. Maybe it's not a carb issue? I doubt it's a spark issue since it seems bound to throttle load, not RPM. I've changed both the CDI and ran a GM DIS coil pack on my CM450 with no changes. Is this just the way these things run? Crappy under 30 or 40% throttle? Pretty annoying!! Any words are appreciated. I feel like nobody has this problem except me and I have it on 2 different 450 twins!! -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to nighthawk_lovers+unsubscr...@googlegroups.com. To post to this group, send email to nighthawk_lovers@googlegroups.com. Visit this group at https://groups.google.com/group/nighthawk_lovers. For more options, visit https://groups.google.com/d/optout.
