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Yamaha aerox wont start when cold?

My Yamaha aerox YQ50 is a problem to start when its cold, it will start after i have kicked it about 40 times. Is this something to do with the auto choke or the thermostat.
Coops, February 2011
Hi it sounds like the head gas kit is letting water/coolent in somwere i had the same problem and changed this and it fired stright away now run perfect.Has the bike got alot of compression piston rings not warn.

lewis, December 2011
it could be worn piston rings

jason mchugh, February 2011
link Click here to see other fixes for Yamaha.