First post, Google indicates there are folks with knowledge around here, so I thought I'd try.
I've got a '73 CB350 which I've recently rebuilt after an oil starvation incident. Clutch pushrod seal popped out, crankcase emptied on the interstate and the right side cam bushing welded itself to the cam. Decide if I was going to rebuild, I'd try to make it faster as I went. (Here's some unnecessary back story if you're interested: http://advrider.com/index.php?threads/cb350-rebuild-advice-needed.1061807/ )
In any case, I've now got 65mm pistons, Megacycle 12320 cam, a mild port/polish, and the fancy kibblewhite valves and springs, all from Bore-Tech. The bike is back together and running, but poorly. Sadly, I'm not sure it's possible to get it running well with stock carbs. No matter what I do, the bike runs crazy rich now. I'm guessing this is from the increased air velocity from the cam/valves/porting My stock CV carbs are in perfect shape, and were working perfectly prior to the rebuild. I'm using a #35 slow jet, #68 primary jet, and #100 secondary. I cannot find anything smaller online.
Admittedly, I'm at 9,200 feet, which is only going to make things worse. But with a stock setup things were happy.
Now I can only get it to idle with the fuel screw all the way in. Thinking I could maybe force it to run leaner by messing with the float level, I dropped the float from the stock 26mm to 30mm. That did allow me to move the fuel screw out 1 turn for optimum idle, but sadly I can't get it to run very well otherwise. Max power seems to be at about 4,500 rpm at 1/2 throttle. More throttle or higher RPM and it just bogs down. Plugs are soot-covered. I can get it up to about 50mph with some careful clutch manipulation and throttle trickery, but it's not happy.
So, what do I do? I can think of 2 options:
1) find someone who can weld jets and drill them back out smaller. Any suggestions?
2) Install Mikuni's like everyone else just so I can jet the thing properly.
#1 sounds miserable and may or may not work.
#2 will probably work, but seems like a stupid answer. I have a set of beautiful stock CV carbs, which are well designed for street use. The CV design is brilliant, and I'd love to keep using it, but I need smaller jets than I can find. I'd also really like to keep the bike looking stock with stock air filters and side covers. (I know, probably not much sympathy for that here...) I'm not building a cafe racer--I want it to look stock, just have a little bit more power.
Do I just need to switch to Mikunis like the rest of you guys? I'm trying hard to keep the bike stock-looking, and I hate to ditch some perfectly good stock carbs just because I can't find smaller jets. If I do need to switch to Mikunis, should I go with 30 or 32?
I've got a '73 CB350 which I've recently rebuilt after an oil starvation incident. Clutch pushrod seal popped out, crankcase emptied on the interstate and the right side cam bushing welded itself to the cam. Decide if I was going to rebuild, I'd try to make it faster as I went. (Here's some unnecessary back story if you're interested: http://advrider.com/index.php?threads/cb350-rebuild-advice-needed.1061807/ )
In any case, I've now got 65mm pistons, Megacycle 12320 cam, a mild port/polish, and the fancy kibblewhite valves and springs, all from Bore-Tech. The bike is back together and running, but poorly. Sadly, I'm not sure it's possible to get it running well with stock carbs. No matter what I do, the bike runs crazy rich now. I'm guessing this is from the increased air velocity from the cam/valves/porting My stock CV carbs are in perfect shape, and were working perfectly prior to the rebuild. I'm using a #35 slow jet, #68 primary jet, and #100 secondary. I cannot find anything smaller online.
Admittedly, I'm at 9,200 feet, which is only going to make things worse. But with a stock setup things were happy.
Now I can only get it to idle with the fuel screw all the way in. Thinking I could maybe force it to run leaner by messing with the float level, I dropped the float from the stock 26mm to 30mm. That did allow me to move the fuel screw out 1 turn for optimum idle, but sadly I can't get it to run very well otherwise. Max power seems to be at about 4,500 rpm at 1/2 throttle. More throttle or higher RPM and it just bogs down. Plugs are soot-covered. I can get it up to about 50mph with some careful clutch manipulation and throttle trickery, but it's not happy.
So, what do I do? I can think of 2 options:
1) find someone who can weld jets and drill them back out smaller. Any suggestions?
2) Install Mikuni's like everyone else just so I can jet the thing properly.
#1 sounds miserable and may or may not work.
#2 will probably work, but seems like a stupid answer. I have a set of beautiful stock CV carbs, which are well designed for street use. The CV design is brilliant, and I'd love to keep using it, but I need smaller jets than I can find. I'd also really like to keep the bike looking stock with stock air filters and side covers. (I know, probably not much sympathy for that here...) I'm not building a cafe racer--I want it to look stock, just have a little bit more power.
Do I just need to switch to Mikunis like the rest of you guys? I'm trying hard to keep the bike stock-looking, and I hate to ditch some perfectly good stock carbs just because I can't find smaller jets. If I do need to switch to Mikunis, should I go with 30 or 32?