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
Lunchbox8922

426 Backfiring/not starting

8 posts in this topic

My brother has been having some problems with his 2001 Yz426F, sometimes it just doesnt want to start, well kick it for long time and it wont start, and backfire alot while kicking. What could be the problem, we put a new spark plug in it and it started. but whats with the backfiring

Share this post


Link to post
Share on other sites

after you change the plug how long did it run ? there could be a little crbon build up . alittle popping is normal at least thats what i was told and have noticed

did the weather change alot recently because temperatures will throw the jetting off

Share this post


Link to post
Share on other sites

My 450 did that once when I had the IDLE turned up too high......piston position

is very important on most four strokes....I don't know how long you guys have had this bike....if your new to four strokes starting can be hard to get used to.

If you have had this bike for awhile and this is something that just started happening....you need to remove the tank and just start checking everything

Wire connecters, coil ground, intake manifold connection.Also try draining the

float bowl (water)

Hope this helps, BC :cry:

Share this post


Link to post
Share on other sites
My 450 did that once when I had the IDLE turned up too high......piston position

is very important on most four strokes....I don't know how long you guys have had this bike....if your new to four strokes starting can be hard to get used to.

If you have had this bike for awhile and this is something that just started happening....you need to remove the tank and just start checking everything

Wire connecters, coil ground, intake manifold connection.Also try draining the

float bowl (water)

Hope this helps, BC :cry:

Ditto What BC says, only tingk I will add is Clean the Carb, the air filter and check the Valve clearance.

A dirty carb will do this, but if your not used to starting a thumper, then you could be flooding it.

Follow this link, lern the drill, live the drill. love the drill -->The Starting Drill

Share this post


Link to post
Share on other sites

i like that starting drill iv had that enemy thing happen to me a few time i think because sometimes on a new plug ill be kicking it like crazy just after it was running flawless :cry:

Share this post


Link to post
Share on other sites

I had the same problem with my 01 426. Initially, I had the valve clearance checked and 3 of 5 were out. This adjustment allowed me to start the bike. I continued having diffuculty. I was changing spark plugs every hour of riding time. I took the bottom of the carb apart and replaced needle, seat and float. The result was a perfect running 426. Once you get the carb set up correctly the bike rides 100% better. It will never stall now.

Good luck. This seems like a lot, but it is well worth it once the bike runs well. :cry:

Mark

01 426

Share this post


Link to post
Share on other sites

pull the hot start out. Especially if you have a DRD one. The plunger will get stuck and give you the symptoms you describe - no starting with the kick starter, back fire, but you can bump start it.

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