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we got a nice day out today, 70 degrees in december so we figured might as well get the honda running right, we got the bike idling fine but it acts like it is only running on the shift side cylinder, exhaust is coming out of both pipes but the brake side exhaust is colder than the shift side
both cylinders are getting gas and spark, and dad checked the timing and it is dead on, he checked it by the books instructions with a timing light, the 4000 rpm advance was not kicking over on the mark when he reved it to 4000 rpm though
the bike is a 1972 honda cb450 k5 with around 20000 miles on it
the bike has fresh plugs and gas and oil too
the compression on both cylinders is pegging my gauge to 10 (all the higher my gauge goes) instantly, both carbs have gas in the bowls too
when dad reved the shit out of it both mufflers where shooting out fire a bit but not constantly
When my bike was running rich the left plug would foul out when it was idling. When I revved it up, that cylinder would pop and then start working. I put smaller jets in and it seems to run better.
I also noticed that the left cylinder will stop running when I start to run out of gas. I guess because the petcock is on the right and the gas has to travel farther to the left side. So, make sure you have a lot of gas. Otherwise, I agree with HerrDeacon's recommendations.
the carbs have not been synced, but they have been cleaned and the floats set
there was enough gas to tell that there was gas in the tank, and the plug was not fouling/fouled, I will put some more gas in the tank though for good measure
I ran out of gas once because I thought there was still enough to get to the gas station. These '72 450 tanks don't drain all the way down even on reserve. Now that I know my left cylinder gives out, I know when I'm running out of gas. Syncing the carbs made a big difference for me. I highly recommend it as your next step.....after getting more gas.
so putting my carbs in the sink will make the bike run better ? rekon it's worth a try
and the flames where Perty
it is supposed to be warmer Monday, so we can sync the carbs and play with the bike a bit more
I will pour more gas in the tank too for good measure
we think it might be the condenser, since that is the only part of the ignition system I have not replaced , we tried switching the wires on the condenser and it would not start or run, we switched them back and it tried to start but we where cold and the bike was cold so we gave in for the day
Mine doesn't either but that is not the root of this problem. Once you get the bike running correctly, you can mess with the advance. This is done by adjusting the mechanical advance springs and flyweight stops (behind the points plate). My springs had stretched a bit and it was advancing itself at idle. I tightened them up and it is much better now.
I still haven't figured out what this thing does. Personally, I don't think it does anything. I think Honda put it on there to let the mechanics know when an owner was trying to adjust his own carbs.
Mine doesn't either but that is not the root of this problem. Once you get the bike running correctly, you can mess with the advance. This is done by adjusting the mechanical advance springs and flyweight stops (behind the points plate). My springs had stretched a bit and it was advancing itself at idle. I tightened them up and it is much better now.
No problem. Glad to help a fellow 450 runner. Our Kehin carbs don't have pressure ports so its really the only way to do it. Once you've been running it for awhile, you can fine tune the sync by ear/feel to get it dead on. I haven't been able to ride mine enough to be able to feel the difference. Only 300 miles so far.
That forum is a great resource for the 450s, too bad MSN is pulling the plug on their forums. Not sure where it will end up. Hondatwins.net has started a 450 section.
No problem. Glad to help a fellow 450 runner. Our Kehin carbs don't have pressure ports so its really the only way to do it. Once you've been running it for awhile, you can fine tune the sync by ear/feel to get it dead on. I haven't been able to ride mine enough to be able to feel the difference. Only 300 miles so far.
That forum is a great resource for the 450s, too bad MSN is pulling the plug on their forums. Not sure where it will end up. Hondatwins.net has started a 450 section.
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