Question about 1986 Yamaha RD 350

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My rd still revs high after shutting off the throttle

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You have a top end air leak(s) that lean the fuel/air mix and that is what is causing the rev problem. Usually what happens is the rubber between the carb and manifold gets cracked and lets in the air. Sometimes it is the manifold gasket or "O" ring seal. A bad head gasket is sometimes the culprit. Seal or replace the rubber parts.

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Posted on Jun 14, 2009

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Hi, Anonymous and the usual suspects are:
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2. Dirt, rust, water, or ethanol sludge in the fuel system.
3. Sticky throttle cables.
4. Multiple carburetors not in synchronization.
5. TPS sensor out of adjustment or faulty.
6. Wrong spark plugs for the type of service.
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For more information about your issue please click on the blue links below. Good luck and have a wonderful day.
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You wont get this engine revs by itself
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3.8 litre park ave seems to crank right up but spits and shuts off immediately.If I continuallypumpthe gas,it seems to 'catch up and rev up vety high.When I stop pumping,it spits and shuts off.


Is the check engine light on while the engine is running ?
If it is I would start there for clues.
If not, the list of possibilities is long.
You should check the fuel pressure and probably the throttle position sensor resistance. It could have a vac leak too.

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1 Answer

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1 Answer

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IF THE THROTTLE SENSOR IS ADJUSTABLE TRY TURNING IT BACK SOME TIMES YOU NEED TO SLOT THE HOLES THAT LOCATE IT TO GET SOME ADJSTMENT

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1 Answer

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3 Answers

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The problem with vents is that a vent can get plugged and lessen or completely kill the flow of fuel. They will not make an engine rev wildly. Your banshee has standard carbs. The throttle cables may be routed incorrectly, pinching or stretching the cables. Remove the air filters. Look inside the carbs. Do the slides move freely up and down when the throttle is twisted? In the diagram below note the junction tube on the throttle cabel. The cable can stick at inside the tube. Is the connector hose between the carbs in place? Also, there is a switch on top of the carb. This can go haywire also. Odd that the problem was not present before they cleaned the carbs.
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1 Answer

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