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Clutches do wear out eventually especially if you 'slip' it regularly. First check the basics. These are usually the quickest, cheapest fixes.
Check it isn't something between the lever and gearbox 'sticking'. Sometime trail dirt can get into the levers and cables gumming everything up.
Do this with the engine OFF and the keys OUT.
If you can, remove the clutch cable from one end. Work the lever on the handle bar to see if it moves freely. Slide the cable backwards and forwards through it's sleeve to see if it slides easily. Next work the lever on the actual gearbox. This might be stiff but it should move smoothly and return to it rest position every time. If these all move freely the issue could be the clutch plates inside the gearbox.
Next pull the clutch in, start the bike, and put it into first gear. Only give it enough throttle to stop it stalling. Gently and slowly let the clutch out and feel to see if the bike rises evenly with the lever or grabs and lurches forward.
If it lurches and the levers and cables move freely you might need to replace the clutch components.
When your engine is running at say 1200 rpm, the transmission is at zero speed with the clutch depressed. When you engage the clutch the first gear is still at zero speed trying to engage with a 1200 rpm crankshaft. In a normal transmission, they have a "synchronizer" which speeds up the gear to match the speed of the crankshaft so the gears mesh smoothly.
When you turn off your engine, the crankshaft is at zero rpm so it can go into gear with the zero rpm transmission. Bottom line...you have a problem with your synchronizer on your transmission. If you are lucky...a transmission shop could fix it without an overhall. But it needs to be diagnosed because it doesn't sound good.
Sounds like something broke in the clutch area. The clutch has springs in it. In there for harsh shifts And dumping the clutch. But the pressure plate could possibly do this as it is also spring loaded. Changing the fluid would do this. The fluid only lubricates the internal parts. IE.. gears, bearings, ad synchronizers. being low isn't good, but still wouldn't cause this problem.
Possible causes are: The clutch is going out, the hydraulic clutch system is low on fluid, or the transmission input shaft is binding on the pilot bearing. 1. Is the pedal firm and does it feel like it used to? (low fluid). 2. Once in gear and moving push on clutch and notice when the transmission disengages. If it does not disengage until the pedal is almost at the top then the clutch is getting thin and will need replacing. 3. With vehicle on a smooth flat surface, depress clutch and try to shift into any and all gears. Notice if vehicle tries to lurch forward as shifter goes into gear. This may be a subtle lurch but should be noticeable. This checks for a binding pilot bushing. Let me know what you find. Thanks and please rate.
Put the car in first and start it up. If the car want's to lurch forward then the clutch is working but not disengaging. Look toward the slave/master cylinders or even the pedal itself. Pontiac used aluminum clutch pedals and they bend over time, hitting the floor before giving you the full length of travel. This causes the clutch to not disengage. 50 bucks at Fierostore.com.
If the car doesn't lurch or the RPM's go up while in gear and clutch out, but the car doesn't go any faster then the clutch is slipping and needs to be replaced.
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