Help Diagnosing engine shut off issue.

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Plormby

Member
#1
#1
Hey guys,
I need some help figuring out this problem on my preadator 212 that’s been causing me problems for a few months now. I installed the stage 1 kit (header, bigger jets, intake) onto it and it runs great low end. However if I rev it out, it feels like it’s falling over up top. Not just that, but if I hold it WOT the engine stutters and eventually shuts off, I can get it to start back up by wiggling the throttle a bit. Any ideas? I just installed a new coil thinking that may have been the culprit but no success.
 
P

Plormby

Member
#3
#3
Kmanator said:
Sounds like a fuel delivery problem to me? The "Wiggling" the throttle is possibly coincidental until the carb bowl fills with fuel again?
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I’m for sure narrowing it down to fuel. I’m just wondering what could be the cause. Could the stage 1 kit really cause the stock gas cap to not vent enough? Or would it just be fuel lines. Carb is brand new so i’m positive it’s nothing in there.
 
Kmanator

Kmanator

#4
#4
Plormby said:
I’m for sure narrowing it down to fuel. I’m just wondering what could be the cause. Could the stage 1 kit really cause the stock gas cap to not vent enough? Or would it just be fuel lines. Carb is brand new so i’m positive it’s nothing in there.
Click to expand...
Check the float level when the problem arises. Check for positive flow on the fuel line to the carb.
 
P

Plormby

Member
#5
#5
Kmanator said:
Check the float level when the problem arises. Check for positive flow on the fuel line to the carb.
Click to expand...
The lines are definitely flowing. I’ll check the float level for sure. Someone had mentioned the float being set too low but i’m pretty positive the 212 doesn’t have an adjustable float.
 
Kmanator

Kmanator

#6
#6
Plormby said:
The lines are definitely flowing. I’ll check the float level for sure. Someone had mentioned the float being set too low but i’m pretty positive the 212 doesn’t have an adjustable float.
Click to expand...
If it has a float needle in a seat you should be able to bend the tang on the float to adjust.
 
P

Plormby

Member
#7
#7
Kmanator said:
If it has a needle in a seat you should be able to bend the tang on the float to adjust.
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I’ll check it out tomorrow and see how it’s sitting. I have a second carb so if for whatever reason that float is shot I can swap it out in 5 minutes. I’ll keep you updated
 
Kmanator

Kmanator

#8
#8
Plormby said:
I’ll check it out tomorrow and see how it’s sitting. I have a second carb so if for whatever reason that float is shot I can swap it out in 5 minutes. I’ll keep you updated
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If the bowl fuel level is low,Bend the tang so the float shuts the fuel off at a higher level in the bowl.{rises higher}
 
P

Plormby

Member
#11
#11
Kmanator said:
I had a road bike leave me on the side of the road once because a cheap plastic barb/filter on the fuel line melted and restricted fuel delivery.
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This thing has left me on the side of the road too. Also do you have any ideas on why it feels like it’s topping over as it revs out. I feel like it has more in it but maybe i’m just doing as much as the valves can handle.
 
P

Plormby

Member
#19
#19
old shed finds said:
Basically your ready for the slide style carburetor. .. Your stage 1 has it running faster than the stock fuel system can deliver... Mukini motorcycle carb...
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I thought about that but the stage 1 really shouldn’t be pulling enough fuel that the stock carb can’t handle it. It’s only got an intake and header. Now if i were to do cams and valve springs then I would for sure think the mikuni is necessary
 
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