Hard starting! Help!!

3 replies to this topic
  • solaidrider667

Posted October 21, 2005 - 08:15 PM


Ok my Yamaha Gods-- I have a 2000 yz 426 , has been running great, lately when starting for first ride I must push start it. (yes very hard)
I have ridden it very hard last two years on supermoto tracks- oil changed every race weekend(Motul 10/40 full synthetic) air filter etc. By the way this bike has taken a 245lb rider to a 2nd in points Starrs Supertt class and current 2nd place in points. The only track it lacks power is Willow Springs.
I have not checked the valves(ever) BAD BAD ME!! I am also curious about a key that comes loose on the crank? I am considering a big bore kit and hot cams.. what about the bottom end? Thanks in anticipation for your help.
:banghead: :banghead: :lol: :busted:

  • Yak

Posted October 21, 2005 - 08:52 PM


First things first....

Change your plug... NGK CR8E

A fouled plug will make starting hard every time, sometimes even impossible.

if not that...

Time to check the valves. Actually, time to check the valves anyway. Just do it.

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  • FlashGordon

Posted October 21, 2005 - 09:03 PM


Check your valves. If they are OK, clean the carb, and consider richening the pilot jet, or turn the fuel screw on the bottom/front of the carb bowl out a couple turns. I found that going up one pilot jet size made a world of difference in starting, and eliminates the popping on de-acceleration. My 400 will start on 2-4 kicks when cold, and 1st kick every time when hot. It was a killer with a stock pilot.

  • PumpkinHumper

Posted October 22, 2005 - 05:18 AM


You have tight valves. That is what is causing your hard starting. Check the valves.

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