Yea, these bikes are pretty damn lean from the factory, which is why I went to such great pains to locate the proper airbox parts. I didn't want it running any leaner than it had to!Scott84 said:Getting the mixture right is definitely tricky but its good to hear that your bike starts that easily! I just got back home from college ill tear into the carbs in the next week and let you know if i need any parts.
They were $30 lol ;DScott84 said:That's awesome what made you think to try and adapt those to the old cb650?
I know this is an old thread, but I just wanted to drop in and say that my bike was acting similarly, and I gave the #80 drill bit a shot. Worked beautifully, and the bike runs many times better.Worst cb650 ever said:Welp, I pulled the carb needle shims, thinking I had fixed the idle issues that had been plaguing me.
I guess I should have not been surprised it idled like crap and had to have the throttle tickled to stay running until I turned the idle knob in big time.
After much head scratching and thinking, I came to the conclusion that the slow jets must be the issue - the bike has plenty mid range and up top when it is running almost exclusively on the main jets, but idles for crap, takes forever to warm up, and tends to stall when the clutch is let out. Rather than drop $22 + $13 in shipping for a set of new #35 slow jets (the press in jets are a real PITA to find), I opted to order up a $13 pin vise and drill bit set. A #80 drill bit is 0.3429 mm, which is pretty darn close to the 0.35 mm hole diameter of a #35 Keihin slow jet.
I carefully started to "drill" through the slow jet, and was surprised to dislodge crusty crap. It appears all the slow jets were reduced to almost half their diameter by crap. I had soaked these jets in old school carb cleaner, and then in the Pine Sol dip of doom, cleaned them out with copper wire, and there was still crap hanging on in them. Gah!
Could you use a "prop" of sorts to adjust the carb angle? Maybe use a little more hose to provide a gentle bend combined with something to "prop" the carbs skyward?Scott84 said:No dont have a build thread that is up to date. I used inch and half radiator hose as an adapter to the head. Im having a problem with the carbs overflowing out the back of the carbs because the carbs are meant to run at an angle and the way they are hooked up is flat. Im going to try to find some time to update the build thread. The bike runs amazing and starts really easily.