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
TheRainMan

Won't Start

11 posts in this topic

Hey All,

Got an 02 426 thats been running great for about a year now. Was out riding last weekend and I stalled the bike in a turn, now I can't get it to start. I changed the plug and it still won't start and checked that the carb is getting fuel. Any suggestions (ignition coil, CDI, etc.....)????

Thanks

Share this post


Link to post
Share on other sites

one time my yz400 wouldn't start for no apparently reason, I unbolted the ignitions coil, cleaned the ground connection and put it back on and viola fired right up the ground must have come loose or got dirt in it.........just a suggestion.....did you check ur valves? timing chain?

Share this post


Link to post
Share on other sites

I'll try unbolting and cleaning the coil/contacts and see what happens.

Haven't messed with the valves or timing yet....still trying simple fixes.

Thnx!

Share this post


Link to post
Share on other sites

Check for spark--if no spark maybe the kill switch is the problem(unplug it may fix problem). If spark is ok check to see if fuel is getting into engine. If fuel is ok then check the valve clearances.

Share this post


Link to post
Share on other sites

Wow Crazy!! Changed the spark plug twice, checked coil, checked spark.

While checking the spark I kicked the bike over about 20 times put the second new plug in and it started on the 2nd kick. No idea what changed but for now it's starting (doing the happy dance)!!!!

Share this post


Link to post
Share on other sites

Also, I just ordered the 03 YZ450 exhaust cam for the MOD. Got one Yamaha dealer here in Albuquerque that swears it won't work and I got the other dealer here saying they have'nt done the MOD before. Not sure if I should do it myself or try the second dealer.

Share this post


Link to post
Share on other sites
Also, I just ordered the 03 YZ450 exhaust cam for the MOD. Got one Yamaha dealer here in Albuquerque that swears it won't work and I got the other dealer here saying they have'nt done the MOD before. Not sure if I should do it myself or try the second dealer.
You have the instructions, right?

http://www.thumpertalk.com/forum/showthread.php?p=3706078#post3706078

Share this post


Link to post
Share on other sites

There is lots of infomation in the link that Grayracer gave you. Spend some time reading that thread to make an informed decision. I am doing it myself this weekend. If you have some mechanical ability and correct tools available I think you could do this mod.

Share this post


Link to post
Share on other sites
There is lots of infomation in the link that Grayracer gave you. Spend some time reading that thread to make an informed decision. I am doing it myself this weekend. If you have some mechanical ability and correct tools available I think you could do this mod.

Thanks everyone for all the help,

Got tired of the starting drill and had a local dealer install the OEM cam. Just picked the bike up today and it starts on the 1st kick. Can't wait to take it out for a ride!!!!!!!!!

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