07 450 sxf hard start

ok, ive had this bike for a little over a month, rode it 6 times and everytime before i leave my house to go ride i start my bike to make sure it will start. seems im out there for over a hour trying to get it to start. being that its electric start with NO kickstart, which sucks!:excuseme::bonk:

i have a brand new battery with 130 cca

on a maintainer when im not ridding

use 93 octaine

when i go to start i

1. turn the gas on

2 pull choke

3. twist throttle once, maybe twice

4. crank it over 4 or 5 times, but no longer than 5-6 sec each times

then nothing... repeat

i know they are cold natured but so is my 520 but she starts up on the first kick everytime, hot or cold.

Check the jetting. If it´s still stock then it´s too lean where it counts the most (especially for cold starting) ; The pilot circuit. Stock pilot is #40. You need to go to #42 or ,if the weather is cold, up to #45.

To get the jetting really right go buy the JD jetting kit.

ive put a #42 in it already. it doesnt get too cold, around 50* or so, thats why i didnt keep the 40 which is better for >70*. i turned up the idle up a 1/2 turn and that seems to help a little, but once it gets warm i have to turn it down, wants to keep taking off... i just got back from my shop, had a heater set up in front of the motor, that helped too.

but wont be able to have one of those at the track once i drive there.

When I had my 07 505 it was hesitant to start with temps in the 40's and lower. I ran a 42 pilot with fuel screw at 2 1/2 out, (Shoulda just put in a 45 pilot), needle at 4th from top, and 5w 30 wt maxima synthetic oil.

The oil I believe helped the most because these engines need to turn over fast in order to start. Cold thick oil seemed to slow down the cranking speed. I was also religious about keeping the bike on a trickle charger when not being ridden. Run the bigger battery that the bike came with or switch to the size 7 battery.

i keep it on a maintainer when its not ridden i also have a YTZ7S in it now. think thats the biggest i can get in it...

How´s the plug? And the plug cap??

How´s the plug? And the plug cap??

new plug and cap is fine

Valve clearance ??

sounds redundant but definately check valve adjustment, a little out and they are hard starting, try turning out the air fuel screw a full turn and see if that helps. my last yz 450 came with the screw out only 3/4 turn and that thing was a bitch to start, the book said that it should be 1 1/2 to 2 turns out, turned it out to 1 3/4 started first kick everytime after that, worth a try

sounds redundant but definately check valve adjustment, a little out and they are hard starting, try turning out the air fuel screw a full turn and see if that helps. my last yz 450 came with the screw out only 3/4 turn and that thing was a bitch to start, the book said that it should be 1 1/2 to 2 turns out, turned it out to 1 3/4 started first kick everytime after that, worth a try

Good point ! I never mentioned this because i thought it was pretty obvious since he has already played with the pilot jet.

Well with my new battery it's only turning over for about ten seconds before you can hear a dramatic drop in the cranking and won't start. I end up having to jump it off another battery. BUT once it's running for about 3-4 min I shut it off and it won't start back up. And again I have to jump it.

Any thoughts


How´s the idle set at ? If it´s too low or too high it can make a bike almost impossible to start. I start to lean towards worn top end though. How many hours ??

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