Bike not starting when hot.

[spannermonkey...]

Hi all

My old zx7r is not starting when hot. It cranks over fine but no bang. haven't smelt the exhaust to see if it's flooding.

Starts eventually when left to stand and cool.

My guess is compression, it gets hot and valve clearances close up and then I'll check the pilot screw settings make sure it's not to lean but besides that is their anything I could be missing?
____________________
Current machines - Aprilia RS250. Kawasaki H1A 500. Past machines - Kawasaki ZX7r P6, Yamaha RD250E (the one that got away), BSA Racing bantam (revs over 10'000 sweet as), Yamaha RXS100, Suzuki GP100, Suzuki GS500K2 - best all year machine ever - come rain, sleet and snow just epic.

[davebike]

Could be tight valve clearances mostly give poor starting when hot and poor hot idle

But too rich mixture will also give same symptoms
____________________
Dave
NC750Xdct + others at work !
davebike1@gmail.com

[Copycat73]

just the age and condition of the spark plugs , leads and connections... as said likely valve clearances.. but I would at least have a look at the colour of the plugs.
____________________
Whatever I post I have no citation and no intention of providing one..
caveat emptor

[Fizzer Thou]

While the spark plugs are out then it would be ideal to perform a compression test.This tool is one of the most used diagnostic aids in my garage
____________________
Just talk bikes.What else is there?

Always have a 'Plan B'

[Matt B]