Today was a relatively warm day today (about 50* in the garage anyway). So I thought I'd get to my still new to me 9.9. (I've had it about 1.5 years now.)
Anyway, I noticed today that the control arm on the throttle linkage wasn't traveling all the way to the stop. It was stopping about an inch short. I could push it all the way to the stop but it felt gooey and a little stiff. It would try to travel on its' own as if a spring were acting on it but again, it wouldn't fully travel to the mechanical stop. I pulled the retaining bolt and bushing out of the throttle cam/control arm assembly and cleaned and greased it. Maybe a slight improvement. I then started twisting the timing link to exercise it. I would've liked to have pulled one end or the other to separate it from the timing but I was afraid I was going to break it. Anyway, exercising the timing link seemed to improve travel enough that the control arm was stopping just shy of the mechanical stop. (1/8 to 1/4")
Maybe everything warmed up enough after playing with it to allow the arm to travel further? There are two springs involved in the control arm/throttle cam assembly. Their function seems to be more to retract the control arm though but I'm not sure.
Replace the springs? (If I ever figure out how to separate the links w/o breaking them?)
The other issue I noticed today was the primer plunger on the carb was sticking down for several seconds after I played with the "choke" knob. I exercised that as well multiple times and got it to where it was operating much better. Activating it with my finger, the plunger would pop back up immediately. With the knob, it would delay a short bit. No gas in the carb while I was doing this. I'm not sure if that makes a difference or not.
I don't know if the carb has ever been rebuilt. It doesn't appear to have been anyway. Time to at least replace the plunger? The motor ran good for me last summer. At least I think it did.
Maybe wait for a nice warm day and test everything again?
Thanks?
Anyway, I noticed today that the control arm on the throttle linkage wasn't traveling all the way to the stop. It was stopping about an inch short. I could push it all the way to the stop but it felt gooey and a little stiff. It would try to travel on its' own as if a spring were acting on it but again, it wouldn't fully travel to the mechanical stop. I pulled the retaining bolt and bushing out of the throttle cam/control arm assembly and cleaned and greased it. Maybe a slight improvement. I then started twisting the timing link to exercise it. I would've liked to have pulled one end or the other to separate it from the timing but I was afraid I was going to break it. Anyway, exercising the timing link seemed to improve travel enough that the control arm was stopping just shy of the mechanical stop. (1/8 to 1/4")
Maybe everything warmed up enough after playing with it to allow the arm to travel further? There are two springs involved in the control arm/throttle cam assembly. Their function seems to be more to retract the control arm though but I'm not sure.
Replace the springs? (If I ever figure out how to separate the links w/o breaking them?)
The other issue I noticed today was the primer plunger on the carb was sticking down for several seconds after I played with the "choke" knob. I exercised that as well multiple times and got it to where it was operating much better. Activating it with my finger, the plunger would pop back up immediately. With the knob, it would delay a short bit. No gas in the carb while I was doing this. I'm not sure if that makes a difference or not.
I don't know if the carb has ever been rebuilt. It doesn't appear to have been anyway. Time to at least replace the plunger? The motor ran good for me last summer. At least I think it did.
Maybe wait for a nice warm day and test everything again?
Thanks?