Mysterious rev climbing
Hey guys, please help me solve this mystery...
So less than 2 weeks ago the bike was running fine. I was commuting on the interstate, everything was shifting smooth, sometimes it would jerk upon take off but I'm also new to motorcycling so I thought maybe that was me, maybe I need to practice smoother on the clutch. I had already taken the carbs apart twice, first to clean them from the previous owner, then the second time because an o-ring got pinched and was having vacuum problems. I bench synched them the last time I put them in, but I had to be Mr Perfect and borrow my friends carb sync tool... and that's where the trouble started.
It's one of the tools with the gauges and hoses, not a cheap blue fluid kind. I plugged it into the vacuum ports on the carb and turned it on. They weren't perfectly in sync, so i figured I wanted to adjust, but I didn't have a wrench that could reach. It ran for a couple minutes with the carb sync tool attached while i tried to reach, but couldn't. There's a motorcycle collective/shop a mile away, so I figured why not ask to borrow a wrench. I plug back in the hoses appropriately and take off.
Immediately the throttle feels weird/jerky/different. I make it half a mile and pull over, take a look at it. Maybe I bumped the screw trying to reach it and made a more out of sync? Well I was only a half mile from the shop so I hop back on and continue. As I pull into the shop, my engine revs through the roof. Goes up to about 6k, so I pull in the clutch and shift into neutral as I park, it stays at 6k and didn't shift into neutral easily, but after 5 or 10 seconds I get it into neutral and cut the engine. White smoke comes out of the right-hand exhaust (attached to front cylinder).
I go inside and ask someone who's working on their bike for advice. We both go out and take a look at it, I start it up and it idles completely fine. I borrow a wrench from him and he goes back inside, I plug in the carb sync tool again and then it starts revving weird. So now I'm like **** this sync tool, I return his wrench we talk about it and he suggests it's probably an air leak, but I start again and it's idling fine again. So I go to ride it home, and before I'm even a 1/4 mile away it revs up to 5 or 6k again, but only when the clutch is pulled in. When I let the clutch out and it has weight on it, it goes back down to 3k, but of course that means it shoots my speed way up.
So I pull over, and 2 other riders pull over to help. I let it cool down, talk to them about it. We all agree it sounds like an air leak, after we let it cool down, we start it up again and surprise it idles completely fine. Revs fine while we're parked, nothing's acting weird. I did notice some smoke coming out of the coasting enrichener though.
I climb on, take it home, as soon as I'm driving it again it revs through the roof. So I rode it home like that, cutting the engine off for long stretches downhill, only starting the bike when I need to go uphill, cause I didn't want it to stay at 6k and lean out.
That was a week ago. Today I go outside and open the coasting enrichener, that little tiny o-ring is missing on one side. (swear I put it in there though, but maybe I was wrong). I have extras lying around so I put it in. Start it up and I can hear a hissing from the opposite enrichener, replaced that little o-ring as well, the hissing stops. Well I guess I solved the air leak. I crank it up and it sounds great, much better than 5 minutes ago. It idles for 5 minutes completely great, I put on gear just to take it around the block, I hop on, and the bike shifts backwards about a foot as I put the kickstand up, and before I even shift out of neutral IT REVS UP TO 4K OR 5K AGAIN!!!!
I'm at wits end with this thing, I try starting a couple more times, always revs after a minute or two of running fine. I sprayed it with starter fluid to try and find an air leak maybe on the boot or the carb.... nothing. It didn't change the revs. And then when I just cut it off the white smoke came out of the right exhaust again.
2 other things I noticed that don't seem related but could be: There's a really slow leak from my radiator, small puddle in the garage, but the levels seem fine. And there's some oil leaking out of the left-hand exhaust where it attaches to the cylinder.
Also the day I tried to sync the carbs and all this **** started was one of the first really hot days we've had in Georgia, definitely the first hot day that I tried to ride the bike.... Let me know what you guys think or if you know anyone that wants to buy this thing.