Super Jet 650 carb adjustment

bmason05

bmason05

Location
Houston Texas
I bought a 1992 SN SJ about 5 weeks ago. First time taking it out, after running it seemed to me throttle response was lacking. After turning it off for about 10-15 min and getting back on it, it would hesitate for a couple throttle hits and run great. Well this past weekend I took it out and turned the screws L/H out 3 full turns. Runs like a bad out of hell now. Hits 140 psi dead nutts on both cylinders. Now after turning the screws out pulled the plugs and seems a mix between coco/greyish. On top end seems to lack the power needed but happy with throttle response. I am not trying to go full speed, would rather a quick throttle then top speed. Now I know very little about carbs but enough to get me through. I have come to the conclusion I need bigger jets and maybe a different pop off spring... any help would be appreciated.:arms:
 
john zigler

john zigler

Vendor Account
Location
wisconsin
Are there any modifications done to your machine that would require different jetting?

I ask, because maybe it is just time for some maintenance. Tune up, carb rebuild, new plugs, fuel filter, ect. You turning the screws out, may just be a "band aid" for another issue.
 
bmason05

bmason05

Location
Houston Texas
it had brand new plugs on the run where I adjusted the screws. I haven't changed the fuel filter or done a carb rebuild yet. I did replace all the fuel, water lines which is all I have done. Last weekend was probably the last ride for the season so I plan on pulling the carb to rebuild. I do plan on getting factory b pipe this winter so I will need bigger jets anyway. I believe the screws should only be out about 1.5 turns at most.
 
Kirchner

Kirchner

Location
Cypress tx
bmason05 said:
it had brand new plugs on the run where I adjusted the screws. I haven't changed the fuel filter or done a carb rebuild yet. I did replace all the fuel, water lines which is all I have done. Last weekend was probably the last ride for the season so I plan on pulling the carb to rebuild. I do plan on getting factory b pipe this winter so I will need bigger jets anyway. I believe the screws should only be out about 1.5 turns at most.
Click to expand...
Do you have and id10 t bolts?
 
bmason05

bmason05

Location
Houston Texas
Your probably right "All Stock 701". This weekend I am pulling the carb and inspecting it. "Kirchner" is just mad his super jet is slow and has stock turf and stock ride plate and mainly a below average rider....
 
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