Hi guys I have a gsxr 750 1999 cranks slow when hot things I've tried
new battery
New leads
new stater
new regulator
new starter
done all voltage tests it's seems engine is getting tight when hot can't even push start as soon as cool it starts rite up and I can ride for any lengthy of time without any issues any help would be appreciated

 

So after trying every tip and trick that I could find including new
regulator
starter
starter selaniod
new ground and live wires
stator
starter clutch
new battery
it turns out it was the engine getting tight when hot
how I figured this out is bike would push start as normal when cold but try when hot and was nearly impossible to push start engine was so tight and wouldn't even turn over with jump pack connected when hot sold it back to guy I got it off he put a 2nd hand engine in with all the old wiring and electrics and the bike starts just fine all the time .so for anyone that has this problem it could be somthing simple but try to push start when cold then when hot and see is there a difference .

 

Check coils. I had a bandit 600 and it did the same thing but I heard that bad coils will cause those problems, I dont really know why tho also, oil cooled or liquid cooled? either way id check the method in which your motoris cooled.