TheGTIjetguy
Member
Hello,
Took the 02 GTI 717 out on the river today after a new top end, rotary valve, and carb clean. Running oil injection and 50/1 premix in the tank for the break-in. Idles perfect, starts well, and has good pickup from low speed. Anything over half throttle stutters though. Can only do about 20 mph as a result. Sounds like it is 4 stroking, running on one cylinder or hitting a rev limiter is the best way I can describe it.
I swear it is running rich, This is my first pwc, but I’ve been working on 2-strokes for a while. Pulling the choke a little bit doesn’t help at all. Neither does pumping the throttle to get the accelerator pump to help it out.
The funny thing is, at idle it runs fantastic, there is a 2 or 3 mile no wake zone, and it ran fine without loading up or bogging the whole way out and back at idle.
I pulled plugs when I got back and they are 100% black, rich looking for sure. Can’t trust that though since I was idling for 10 min on the way back.
Does it sound like I am on the right track with rich running at full throttle only? Just a note, when I cleaned the carb it had a silver spring for the needle. My research since then has seemed to indicate that I need a black spring? Would that cause that?
Thanks for the help! Trying to enjoy the nice weekend!
Took the 02 GTI 717 out on the river today after a new top end, rotary valve, and carb clean. Running oil injection and 50/1 premix in the tank for the break-in. Idles perfect, starts well, and has good pickup from low speed. Anything over half throttle stutters though. Can only do about 20 mph as a result. Sounds like it is 4 stroking, running on one cylinder or hitting a rev limiter is the best way I can describe it.
I swear it is running rich, This is my first pwc, but I’ve been working on 2-strokes for a while. Pulling the choke a little bit doesn’t help at all. Neither does pumping the throttle to get the accelerator pump to help it out.
The funny thing is, at idle it runs fantastic, there is a 2 or 3 mile no wake zone, and it ran fine without loading up or bogging the whole way out and back at idle.
I pulled plugs when I got back and they are 100% black, rich looking for sure. Can’t trust that though since I was idling for 10 min on the way back.
Does it sound like I am on the right track with rich running at full throttle only? Just a note, when I cleaned the carb it had a silver spring for the needle. My research since then has seemed to indicate that I need a black spring? Would that cause that?
Thanks for the help! Trying to enjoy the nice weekend!
