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Old 06-08-2013, 10:53 PM
wmortenson wmortenson is offline
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Default Engines trouble
Does anyone know what would cause an open rpm engine to cut out just before it reaches top rpm. It's not running out of gas, the jets have been drilled oversized also. Was wondering if maybe the valves are floating. It acts just like you would of let of the gas.
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Old 06-09-2013, 02:22 AM
J-Mech J-Mech is offline
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Well, you say open RPM, then you say top RPM......

What is the top RPM? Yes, if high enough you could be floating the valves.... Or, you could be running out of fuel..... Need more info.
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Old 06-09-2013, 07:55 AM
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I'm almost willing to bet your draining your fuel bowl of fuel. Check to make sure the float isn't set to low. And slightly larger line could help. The carbs wernt ment to provide asnmuch fuel as a non governed engine needs
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Old 06-09-2013, 08:01 AM
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is the carb modified for an ungoverned engine? do you have good valve springs in it?
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Old 06-09-2013, 04:42 PM
wmortenson wmortenson is offline
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Carb has been bored. Running electric fuel pump. Bowl is set so it allows more fuel than normal. Jets have been enlarged. Running heavier than stock valve springs but not too heavy because running a cast cam.

What I mean by top rpm is where the engine sounds like it is reaching the point where it can't spin any faster. It does this at about 6500- 7000 Rpms.

Is it possible it could be getting too much fuel? Yet the plug shows its running a little lean.
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Old 06-09-2013, 04:58 PM
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does it pick back up again after that or just dies or drops to idle?
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Old 06-09-2013, 05:08 PM
wmortenson wmortenson is offline
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It drops a ways not all the way to idle though. But it will pick back up and almost drop immediately again.
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Old 06-09-2013, 05:17 PM
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does it fog out the carb when its doing this ?
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Old 06-09-2013, 05:36 PM
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is this a new engine or has it been run with no problems in the past?
whenever I have issues with a motor I start with the basics. check your timing, make sure spark is good, check your valve lash. I would change the float level back to level with the carb tipped upside down unless you run a return line back to the tank. how much fuel PSI are you running? gas? alky? is this a SA cam? .330 lift. is it a flat top design or a typical profile? is this a 16?
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Old 06-09-2013, 05:38 PM
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who's carb is it?
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