We've been working on it at random for a few years now and it's never been fully right. It was my grandpa's and he gave it to my dad and then my dad gave it to me. It ran great until my dad parked it so it hasn't really been on the road since the early 2000s. We have cleaned the carbs and synced them. It's a stock air filter. I don't have cheap pods on there. The only mod that's been done is mufflers. I know my dad put a stator in it at one point. Like I said above I have put a battery in it. I'm trying to build a street tracker but I want to get it running right before I spend the money to finish it cosmetically.
That's good. When was the last time the plugs were changed? How about the plug caps?
Just so we're all on the same page... there's carburation, ignition and charging... three separate systems.
Ok sorry let me explain everything better. This bike was my grandpa's, then my dad's, now it's mine. My dad parked it in the early 2000s and it hasn't been on the road since then. The past few years me and my dad have tinkered with the bike trying to get it running right. It's pretty much stock other than aftermarket mufflers. Stock airfilters. Stock motor. The things we have done to try to get it to run right are clean the carbs and a carb kit, synced the carbs the best we could, replaced the plugs, and changed the battery. The bike will start up and once it warms up there is no stumble when you rev it. It's only when I ride it down the road that it stumbles on the top end. I can't take a video because it doesn't do it without being ridden. I don't think we have a manual I'll have to check. We didn't replace the spark plug caps we didn't see an issue with those. If there's anything else that you need to know just ask me.Just so we're all on the same page... there's carburation, ignition and charging... three separate systems.
You're getting about 14.5v when revved. That says charging is OK. We can eliminate charging.
Now we need to eliminate one of the remaining two. And of the two, ignition would be the easier to eliminate as a source of the problem.
So I'm leaning toward ignition for that reason... it's the easier.
You replaced the plugs. Any particular reason, or jus' because? The caps? Manual?
Another favorite saying from my old boss.... "The first place to look, is the last place you worked on."
Was it running good before? What have you done 'tween then and now? More answers... we need more answers man.
Troubleshooting without touching and hearing can be pretty hard. Can you shoot a video of the misfiring and put it up here?
Define top end... 5k revs... 7500? I assume you also mean at full throttle? Try backing off the throttle "slightly" as soon as the stumble. Did it get any better?
As far as I know they are stock caps and wires. I'll get to around to checking those things at some point this week.
It's been around a year ago that we did the carb kit but if I remember right we didn't change the jets we just cleaned it and put new gaskets. When I rode it down the road it pulled good through mid range and but once I got to full throttle it would sputter and run bad. Once I would drop back down in rpms it would smooth out. It also will blow smoke out when you rev it that smells like gas. The smoke goes away some once it's warmed up.
