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Re: automatic idle quit working and engine runs at high...
You can google for the manual, try http://simpsoncleaning.com/product/msh3125-s/ .
Meanwhile look for a broken link or spring to the throttle linkage, usually an "arm" on the side of the motor.
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Yes it is high if it still does that when it is warm. Cold idle speed is higher. Perhaps they will slow it down at first service.
Typically, the idle speed will be set at a value in the range of 600 to 800 RPM, but the exact value will depend on the number of engine cylinders and whether the vehicle is equipped with a manual or automatic transmission.
Low oil pressure at idle can be caused by an engine with worn rod or main bearings due to (usually) high mileage . This however does not mean the engine is still not serviceable as long as the oil pressure is low only at idle. The pressure should at minimum get into the normal range at anything above idle speed.Not much oil pressure is really necessary at LOW speed. At low speed, as long as there is oil getting to the bearings, even at low pressure, you are OK. In a high mileage engine the oil pressure is often low at idle simply because the oil pump is turning slowly and cannot maintain higher pressure between the larger than normal crankshaft and bearing clearances. As speed increases the pump turns faster and supplies more oil and the pressure should go higher. Low pressure as long as it is only at idle is not a problem. However at higher speeds the pressure should be in the normal range. Such a worn engine can benefit from higher viscosity (thicker) oil such as 20W-50 in above freezing weather and 10W-40 in winter. That will increase idle pressure and the thicker oil film maintains a better film between the worn parts
Your throttle plate and or governor arm may be out of whack. Download a technical service manual in a pdf off the internet and follow the instructions on how to set them. Be sure to put a 6mm pin or bolt in the hole while adjusting. You want to set your governor arm prior to setting the throttle plate. I had the exact same issue on mine and that was the resolution. Good luck and be sure to set your rpms correctly for high and low speed idle. Again the technical service manual will provide info on how to do it all. They sell a little hour / rpm gauge on ebay or amazon for like 15 dollars where you just have to wrap the wire around the plug wire 4 to 5 times and it will read your rpms. :)
I suggest you clean the upper intake using the instructions below. To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.
The normal idle speed is below 1,000 rpm...between 800 to 900 rpm. I suspect that the idle-air control motor has seized and can no longer automatically adjust the engine's idle speed. This part is also responsible for slightly increasing idle speed when the airconditioning is switched on to compensate for the added engine load. Some cars even have a "step-up" solenoid to increase idle.
When replacing the idle-air control motor, remember to clean the port that IAC motor goes into; there will be some carbon build-up that may prevent the part's cone-shaped valve from seating properly. A can of intake valve spray helped along with some Q-tips works well.
Check the air cleaner and muffler for plugging. One screw adjusts the idle stop (idle speed) position and the H and L jet screws set fuel mixture for high speed and idle speed mixture respectively. Turn both jet screws CW to stops (lightly) then back each out CCW 1-1/2 turns. This is a basic setting and should allow the engine to start and run. Start the engine and allow to warm up. Pull the throttle full on and adjust H CW until the engine starts to speed up, but 4-strokes. Correct adjustment is when the engine 4--strokes running free, but immediately 2-strokes when cutting. Release the throttle and adjust L needle CW until the engine idles fairly well, but allows the engine to 'follow the throttle'. Adjust the idle speed screw so that the chain stops turning, but the engine will continue to run. Hope this helps!
You don't have to do anything It does it on its own as long as the pieces are all there. The power valve is the thing that opens up a larger exhaust hole for the two stroke engine. It is shaped like a spool and it twists as pressure builds due to high rpm. On the 1984 it is on the left side of the bike right up front behind the clutch cover.
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment NGEC0549 PREPARATION NGEC0549S01 1) Make sure that the following parts are in good order. I Battery I Ignition system I Engine oil and coolant levels I Fuses I ECM harness connector I Vacuum hoses I Air intake system (Oil filler cap, oil level gauge, etc.) I Fuel pressure I Engine compression I EGR valve operation (If so equipped) I Throttle valve I Evaporative emission system 2) On air conditioner equipped models, checks should be carried out while the air conditioner is OFF. 3) On automatic transmission equipped models, when checking idle rpm, ignition timing and mixture ratio, checks should be carried out while shift lever is in “N” position. 4) When measuring “CO” percentage, insert probe more than 40 cm (15.7 in) into tail pipe. 5) Turn off headlamps, heater blower, rear defogger. 6) Keep front wheels pointed straight ahead. 7) Make the check after the cooling fan has stopped.
SEF976U 3. Open engine hood and run engine at about 2,000 rpm for about 2 minutes under no-load. SEF977U 4. Perform diagnostic test mode II (Self-diagnostic results). Refer to EC-644. SEF217U OK or NG OK ' GO TO 2. NG ' 1. Repair or replace components as necessary. 2. GO TO 2. BASIC SERVICE PROCEDURE VG33E Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d) EC-616 2 CHECK IGNITION TIMING 1. Run engine at about 2,000 rpm for about 2 minutes under no-load. 2. Rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed. SEF978U 3. Turn off engine and disconnect throttle position sensor harness connector. SEF975R 4. Start and rev engine (2,000 - 3,000 rpm) two or three times under no-load, then run at idle speed. 5. Check ignition timing with a timing light. SEF371S 15°±2° BTDC (in “P” or “N” position) OK or NG OK ' GO TO 4. NG ' GO TO 3. GI MA EM LC FE CL MT AT TF PD AX SU BR ST RS BT HA SC EL IDX BASIC SERVICE PROCEDURE VG33E Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d) EC-617 3 ADJUST IGNITION TIMING 1. Adjust ignition timing by turning distributor after loosening securing bolts. 2. Turn off engine and connect throttle position sensor harness connector to throttle position sensor. SEF972R ' GO TO 2. 4 CHECK BASE IDLE SPEED With CONSULT-II 1. Read idle speed in “DATA MONITOR” mode with CONSULT-II. PEF356V 700±50 rpm (in “P” or “N” position) Without CONSULT-II 1. Check idle speed. 700±50 rpm (in “P” or “N” position) OK or NG OK ' GO TO 6. NG ' GO TO 5.
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