I'm wondering if you have any advice for me on the Honda 550 that I'm working on. I ran a can of sea foam through it (gas tank, crankcase, and in through the carbs). Now it runs, but it won't run below 3000 rpm without the choke on. Above 3000 rpm it runs great. If you are cruising at say 2500 rpm, and open the throttle, it sputters until it gradually works its way up to about 3000 rpm. I think a couple of the cylinders aren't even making power at that point. Once it hits 3000 rpm, everything changes fast, the power comes on strong, and it runs great.
I cleaned out the carbs when I had them off the bike, although they didn't look that bad when I had them apart. The fact that it runs fine at low rpm as long as the choke is on leads me to believe its starving for gas on those cylinders...which makes me think low speed jets. Still, I did clean it out and it didn't look bad, so I question this conclusion. The main jets are attached to the CV slides, and the whole thing is vacuum actuated. (The throttle controls the butterflies). Is it possible that the slides (and main jets) are sticking closed? They looked good when I had them apart, and I did put a light coat of WD40 on them when I had them apart to make sure they slide OK. If they were sticking would them come unstuck so consistently at 3000 rpm? So far besides cleaning the carbs, I've verified the compression is good, installed new plugs, added gas stabilizer, and cleaned the carbs twice. I'm kind of pulling my hair out trying to figure this one out, and the bike is ready to go except for this problem. Do you have any ideas for me? Thanks for any thoughts you might have. -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/nighthawk_lovers. For more options, visit https://groups.google.com/d/optout.
