HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
b-bike

Cold Weather Starting?

12 posts in this topic

In the typical winter weather around here (Oregon) the temp gets up to the mid 40's with the mornings droping to low to mid 30's. My bike has no poblem starting in the summer but not so in the winter.

Does you starting routine change for winter? If so... What is it?

Do you change you jetting for the colder weather? If so... What is it?

Boyd

Share this post


Link to post
Share on other sites

With drastic temperature changes, you may have to rejet. As the temperatures plummet, the air is more dense, and your engine is now subjected to a more lean condition. Try the pilot screw first, and if that doesn't fix it, replace the pilot jet. Anyone have anything else more in depth? I'm in Florida, and don't notice any huge differences, nothing that the pilot screw can' fix, anyway.

Share this post


Link to post
Share on other sites

Awe come on guys... What gives?? :cry:

There has got to be more of you guys that have overcome this cold weather start-up problem. Eather that or I have the only bike that acts like this??? :cry:

Boyd

Share this post


Link to post
Share on other sites

I have a YZ400F that was really easy to start and restart when hot. But when the weather got cooler here in eastern WA. everything changed. I went from the std. #46 pilot jet to a #50 and now it starts on the 3rd or 4th kick when cold and 1st or 2nd when hot. You might need to raise the needle a little too. :cry:

Share this post


Link to post
Share on other sites

"Really Cold" here is only about 40 by ride time. I usually just give it another couple of throttle twists for the extra prime, no problem. :cry:

Share this post


Link to post
Share on other sites
I agree, you have to give the throttle a few good twists.

Boyd, I used to give the 426 a couple of twists of the throttle when it's really cold outside and it would spring to life. You might try one twist and then a couple of kicks and if it doesn't light up then another twist or two and keep kicking. Be careful not to flood it.

Share this post


Link to post
Share on other sites
to avoid flooding it run a 72 starter jet for the colder weather. :cry:

Listen to Indy. He knows his jetting. The starter jet maked a HUGE diferance in cold weather starting. Not the pilot jet but the starter jet. Its in the bottom of the carb next to the pilot and main.

In the winter on my YZ400 I go one size bigger on the main and pilot. Go from a 65 starter to a 72. Move the needle up 1 notch. This is in say 20 deg weather. Runs soooo much better.

The starter jet curses that starting-stalling, starting-stalling, starting-stalling, starting-stalling, till it stays running routine.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0