THE BIKE CREAPS WHEN THE CLUTCH IS DISENGAGED THIS ONLY STARTED HAPPENING AFTER I REPLACED THE IDLER KICK STARTER GEAR AND HAS THE CLUTCH OUT

safety switches that require for you be astride the bike and the clutch disengaged
stops anyone from hitting the starter switch when on a stand and in gear and the bike taking off and doing damage with no rider

idler gear nothing to do with engine timing .right

did the bike stop dead when the idler pulley broke
if the timing chain skipped a tooth some how
timing marks could be off by one tooth only

strange you have spark and fuel but no compression

you will have to take of some covers off
recheck timing marks
check valves and piston are no damaged

Here are the steps from the manual:
Electric Starter Removal
1. Remove L.H. crankcase cover.
2. Remove idler gear 1 and shaft.
3. Place a folded rag between the kick idler gear two (2) and pump drive gear as shown. Remove pump drive gear nut and gear. Remove cam chain.
4. Remove starter clutch assembly.
5. Remove oil delivery pipe.
6. Remove cam chain dampers.
7. Remove two (2) starter motor securing bolts. Remove starter motor.
You can find PDF files of a service manual by googling:
"XS750 Service Manual"

The Clutch on some bikes will disengage the starter motor. Yamaha will not allow you to engage gear when the side stand is down. Hope this gives you some idea

Great bike!

To get to the kick starter shaft and idler gear you will first have to remove the kick start and brake levers. Then remove the water pump cover and circlip, the impellor, and steel drive pin. Then remove all side cover bolts and pull the cover off the engine. Don,t let the water pump shaft come out of the engine when you pull of the cover . Suggest the best thing to do is set the engine in TDC with the timing marks on the cam side together. When the shaft come out you have to time it again, so hold it in place in the engine.

Hold WP shaft down with your thumb while pulling on the cover.

Once the cover is off the Kick Start idler gear assembly lifts out easy but as you put it together there is a center punch mark on the gear that goes in first that MUST be in aline with the spring hole drilled into the shaft, if not in aline the starter will engage at the wrong point.

Reinstall new shaft and idler gear in reverse order.

all kick starter kicks back when starting just give it a little keck like just push dawn on the kick starter to wear it just turnes over 1once than jump on it than it should fire without kicking back but kick it hard or it will kick back

The kick shaft gear, idler gear, and clutch drum gear on the 1985 xr250 and below are smaller tooth gears than 1986 and newer. I have an 85 and an 88. I had to replace the 85 kick gears 3 times. The last time I replaced them I found that the larger gears on the 88 fit as long as you replace only the gears. The kick gear comes off the shaft and the larger tooth gear fits on the shaft. The larger idler gear fits where the smaller tooth idler was and the drum gear comes out and the larger tooth gear will fit there. Or the drum you have with the larger gear will now fit the other gears. This is a better solution than finding another drum with the smaller tooth gear because the smaller tooth gears will not last. I hope this helps.

Put the bike in 3rd, 4th or 5th gear, the higher the better. Sit on the bike, with your hand off the clutch lever, and rock the bike back and forth to rotate the clutch hub. This might free up the lever. You will need to drain the oil and remove the right side casing to see and service the kick starter. If I recall correctly, there is a spring clip that allows the kick gear to engage the clutch hub. The piece could be broken, weak or out of position.

Please rate this answer. Thanks Shay!

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.