I need some advice.
Over the winter, I removed the carburetors. I blew out the jets, inspected and cleaned everything, and replaced all four float bowl gasket sets (CAB-Y39). I set the float height according to the service manual and adjusted the idle mixture screws to 2.5 turns out.
The motorcycle runs perfectly: it idles smoothly, throttle response is instant, the RPM drops back immediately after revving, and there are no hesitations, bogging, or flat spots at all.
BUT...
On the first cold start, the engine cranks for about 3–5 seconds. It initially sounds like it's about to catch, then spins freely for a couple of seconds, then catches again and starts. With the choke fully on, it settles at around 2800 RPM.
Also, if I ride the bike and then leave it parked for a couple of hours, it will still take 2–3 seconds to start, even with the choke applied.
Could someone please advise? Would it make sense to turn the idle mixture screws out to 3 turns, or is this more likely a float level issue that would require going back into the carburetors and adjusting the fuel level in the float bowls?
The bike runs absolutely flawlessly once started. My only concern is the starting behavior. Thanks in advance for any suggestions!
I haven't checked the fuel level using the drain-hose-into-a-bottle method. Before starting the bike, I usually wait about 5 seconds until I hear the fuel pump relay click.
Over the winter, I removed the carburetors. I blew out the jets, inspected and cleaned everything, and replaced all four float bowl gasket sets (CAB-Y39). I set the float height according to the service manual and adjusted the idle mixture screws to 2.5 turns out.
The motorcycle runs perfectly: it idles smoothly, throttle response is instant, the RPM drops back immediately after revving, and there are no hesitations, bogging, or flat spots at all.
BUT...
On the first cold start, the engine cranks for about 3–5 seconds. It initially sounds like it's about to catch, then spins freely for a couple of seconds, then catches again and starts. With the choke fully on, it settles at around 2800 RPM.
Also, if I ride the bike and then leave it parked for a couple of hours, it will still take 2–3 seconds to start, even with the choke applied.
Could someone please advise? Would it make sense to turn the idle mixture screws out to 3 turns, or is this more likely a float level issue that would require going back into the carburetors and adjusting the fuel level in the float bowls?
The bike runs absolutely flawlessly once started. My only concern is the starting behavior. Thanks in advance for any suggestions!
I haven't checked the fuel level using the drain-hose-into-a-bottle method. Before starting the bike, I usually wait about 5 seconds until I hear the fuel pump relay click.
