- Location
- St. Louis
Hey guys,
First off, thanks in advance if you read this novel:
'90 superjet 650. When I picked it up for 250 off of craig's list it fired right up and ran. Brought it down to the river and it ran to a peak of about 25mph. It was coughing and sounded like crap. Took it home and replaced all fuel lines, fuel filter, and put in a primer kit. Then it wouldn't start at all unless the primer fed it some gas. The gas tank has positive pressure (not sure if it should) because it shot gas out of the "on" hose when I pulled the hose so I figure it isn't the fuel pick up. I bypassed all filters and switches and ran the "on" line directly to the carb. Still no go unless primed while starting. Spark is there, compression is 149 150. Pulled the carb off and rebuilt it, replacing every gasket on the intake side in the process. Mikuni carb rebuild kit used. It did the exact same thing once reassembled. Wasn't sure if it was an exhaust leak so I pulled the entire exhaust off and cleaned it, and then I replaced every gasket on the exhaust side. Still the same.
Description of exactly what happens:
Prime twice and visually see fuel enter carb. Press starter and it fires a couple times, but it doesn't sound to healthy. Then it backfires and will not fire again unless primed. If primed while the starter is turning the motor over it will fire a couple of times, but, again, it doesn't sound like a healthy 2-stroke.
So......Do I just suck at rebuilding carbs :banghead:? Low speed needle is at 2.5 turns and high speed is at 2.5 turns.
Kept the high speed at 2.5 turns and went 1/4 turn at a time on the low speed until 5.5 turns. Then repeated with the high speed at 3.0 turns.
Again, I'm questioning my rebuild skills because to me, everything seems to be pointing at the carb and a lack of fuel.
At this point I'm thinking about having the carb professionally rebuilt. Any thoughts/suggestions?
Thanks again
Mitch
First off, thanks in advance if you read this novel:
'90 superjet 650. When I picked it up for 250 off of craig's list it fired right up and ran. Brought it down to the river and it ran to a peak of about 25mph. It was coughing and sounded like crap. Took it home and replaced all fuel lines, fuel filter, and put in a primer kit. Then it wouldn't start at all unless the primer fed it some gas. The gas tank has positive pressure (not sure if it should) because it shot gas out of the "on" hose when I pulled the hose so I figure it isn't the fuel pick up. I bypassed all filters and switches and ran the "on" line directly to the carb. Still no go unless primed while starting. Spark is there, compression is 149 150. Pulled the carb off and rebuilt it, replacing every gasket on the intake side in the process. Mikuni carb rebuild kit used. It did the exact same thing once reassembled. Wasn't sure if it was an exhaust leak so I pulled the entire exhaust off and cleaned it, and then I replaced every gasket on the exhaust side. Still the same.
Description of exactly what happens:
Prime twice and visually see fuel enter carb. Press starter and it fires a couple times, but it doesn't sound to healthy. Then it backfires and will not fire again unless primed. If primed while the starter is turning the motor over it will fire a couple of times, but, again, it doesn't sound like a healthy 2-stroke.
So......Do I just suck at rebuilding carbs :banghead:? Low speed needle is at 2.5 turns and high speed is at 2.5 turns.
Kept the high speed at 2.5 turns and went 1/4 turn at a time on the low speed until 5.5 turns. Then repeated with the high speed at 3.0 turns.
Again, I'm questioning my rebuild skills because to me, everything seems to be pointing at the carb and a lack of fuel.
At this point I'm thinking about having the carb professionally rebuilt. Any thoughts/suggestions?
Thanks again
Mitch
