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wont rev past 3500
- Thread starter chakaman
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If you have the wrong "key" it will limit your rpms like that. Has it ever run faster with the current key you are using?
They make a "child key" that allows kids to only go a certain speed. It is a different color than the regular key, but I am not sure about your specific model.
They make a "child key" that allows kids to only go a certain speed. It is a different color than the regular key, but I am not sure about your specific model.
What year SPX do you have and I'look into it for you.
Karl
Karl
It sound like it is the RAVE valve system. Here is a discription of them an a way to clean them;
The RAVE, (Rotax Adjustable Variable Exhaust) valves are located above the exhaust valve. There are 2 of them per engine. They are round with a red adjustment screw in the middle. It has a clip that holds it together. How they work is that they open the exhaust port larger as the engine rpm's increase. When the rpm's drop down so do the RAVE valves. They work on the principle of the pressure of the exhaust system. Rpm's increase, pressure increases and the valve opens, rpm's drop pressure drops, Valve closes. They should be de-carbonized annual. To disassemble the rave valves, remove the spring clip on top, remove the black cover. There is a spring under the cover. Remove the piston by turning it with a metric socket. On the bottom of the piston is the rubber "Bellows" be careful with the small retaining spring that hold the bellows on the piston. Remove the 2 allen screws that hold the base on the cylinder. Remove the base and gasket. The long valve won't fall in the cylinder just pull it out. There is an o ring under the base, on the shaft of the guillotine valve. Be careful to see how it came apart as it has to go back together that same way again. On the base, notice the notch that it is facing down. Clean all the carbon off the guillotine valve. I use carb cleaner and 400 grit paper. Check the bellows for any small pin holes. If so replace it. If not, reassemble it on the clean guillotine valve, and install it back on the engine the same way it came apart. The guillotine valve only fits one way. The one closest to the exhaust pipe will come off differently then the other one. You will have to remove the allen screws and turn the base so it clears the exhaust pipe. I would do one at a time in case you forget how it goes back together again. This way you can look at the other one and copy it. Do both engines 2 per engine. Take your time and if you have questions give us a shout. We'll be here to help you out.
If the RAVE valves are dirty it will not rev up correctly and could be causing your problem.
Karl
The RAVE, (Rotax Adjustable Variable Exhaust) valves are located above the exhaust valve. There are 2 of them per engine. They are round with a red adjustment screw in the middle. It has a clip that holds it together. How they work is that they open the exhaust port larger as the engine rpm's increase. When the rpm's drop down so do the RAVE valves. They work on the principle of the pressure of the exhaust system. Rpm's increase, pressure increases and the valve opens, rpm's drop pressure drops, Valve closes. They should be de-carbonized annual. To disassemble the rave valves, remove the spring clip on top, remove the black cover. There is a spring under the cover. Remove the piston by turning it with a metric socket. On the bottom of the piston is the rubber "Bellows" be careful with the small retaining spring that hold the bellows on the piston. Remove the 2 allen screws that hold the base on the cylinder. Remove the base and gasket. The long valve won't fall in the cylinder just pull it out. There is an o ring under the base, on the shaft of the guillotine valve. Be careful to see how it came apart as it has to go back together that same way again. On the base, notice the notch that it is facing down. Clean all the carbon off the guillotine valve. I use carb cleaner and 400 grit paper. Check the bellows for any small pin holes. If so replace it. If not, reassemble it on the clean guillotine valve, and install it back on the engine the same way it came apart. The guillotine valve only fits one way. The one closest to the exhaust pipe will come off differently then the other one. You will have to remove the allen screws and turn the base so it clears the exhaust pipe. I would do one at a time in case you forget how it goes back together again. This way you can look at the other one and copy it. Do both engines 2 per engine. Take your time and if you have questions give us a shout. We'll be here to help you out.
If the RAVE valves are dirty it will not rev up correctly and could be causing your problem.
Karl
Usually they don't need to be re-set. I would leave them where they are and see how it runs. Make sure the bellows don't have any pins holes in them or rips and cracks. The RAVE relies on a tight seal to operate correctly.
Karl
Karl
took it out ran good for about 1 min then the same thing if i let it idle for a little and then nailed it it would take off then back to the same im going to take the carbs apart it acts like there is something blocking it took the screen out under dash its clean thanks for the help
Keep us posted on the problem, if you need more help give us a shout.
Karl
Karl
carbs...
If the carbs were clean but for a little gunk around the diaphragm and needle valve, then you should be able to just clean them up and put them back together. There's a little, small, plastic filter in the carb......what did it look like?
If you need to rebuild, go to www.sbtontheweb.com and look at their prices....they are really reasonable with all their repair products.
If the carbs were clean but for a little gunk around the diaphragm and needle valve, then you should be able to just clean them up and put them back together. There's a little, small, plastic filter in the carb......what did it look like?
If you need to rebuild, go to www.sbtontheweb.com and look at their prices....they are really reasonable with all their repair products.
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