Clutch engagement problem

So if you raise the revs to say about 4000 rpm and let the clutch out does it stall or judder or both will it engage at all and pull away ?

Did it ever work with that clutch? I'm assuming that the clutch has been changed and now it isn't working. That clutch should engage at 2300 rpms but your governor might not be allowing it to rev up to it's full speed. If you remove or change the governor, that's about the only way you'll get the rpms necessary for a solid clutch engagement. Changing the sprocket without maintaining a high enough engine speed for complete engagement of the clutch first will only create clutch slippage and eventually failure. So, to answer your question, get the engine speed higher and then work on the right sprocket ratio.
Good luck!
Ed

I would guestimate that your throttle position sensor is going bad. Or vac line. Hard to say with out vehicle info

The TPS can play funny tricks like this. Also sounds like a throtle linkage problem as well. Do u mean disengaged rather than engaged?

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could be a lot of things. sounds minly like you need a valve adjustment. could also be a carb issue or an air leak around the carbs ( carb boots not on all the way or cracked).

check under dash where pedals are as there may be wiring there that the pedals are touching and shorting out

check there are no kinks or sharp curves in the cable, that it routes cleanly. Otherwise you need to look further at the clutch itself.

when u engage u have to push in clutch and wait for spinning gears to stop the engage pto and let out clutch, excessive spinning of gears can be caused by low transmission grease also causing grinding

Hi and welcome to FixYa,

Initially, if the bike will be run without its own battery, the engine will really stall. This is because there will be no consumer for the voltage output other than the ignition system which will clamp down when the engine is revved and the voltage tends to go higher still.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Sounds a lot like clutch slippage to me. First I would check clutch oil. If it is low or worn enough to have lost its viscosity that could be the cause. Here is the backyard **** mechanic way to check clutch wear and slippage. Crude but effective. Point the bike toward a sturdy flat stationary object (a brick wall?). Roll the front wheel firmly against the wall. Make sure the bike is perfectly perpendicular to the wall, the frot wheel is aligned straight, and that the rear wheel is on a solid surface (concrete or asphalt -- not grass or dirt). Climb aboard into riding position and start the bike. In first gear clutch in, rev the bike as you would for a moderate start away from a stop (maybe 3k-4k or so) and slowly release the clutch. If the clutch is good, as the clutch starts to grab the revs will go down noticeably, and as it gets fully engaged or close to it the bike will stall. If the clutch is slipping (depending on how bad it is) the motor will continue to spin at pretty much the same speed as the clutch is engaged. This is a kind of touch-feel thing but if the clutch is bad, you should know it. Needless to say do this carefully and at your own risk, but it works a wonder if you do it right. Another way to check is to ride the bike. Get into the power range barely (above 8K) and hold it steady. Does not really matter what gear, but I suggest 2nd or 3rd. Whack the throttle. If the RPMs rise quickly (quicker than the speed) you've got clutch slippage.,,,