Yz 426 01 - Stalls under load

Need Help. Last week I purchased a 01 426 and the thing ran beautiful when I was testing it out so I packed it up and brought it south to KY to ride over the weekend. I get here and the thing fires up on the second kick after a five hour run at below 30 degree temps I ride it around for five-ten minutes then I stalled it from a stand still. I used the hot button it fired right up and like a chump I stalled it again -from a stand still.:thinking: Now no fire. I finally figured out that like a newbie I flooded it. After my leg wore out kicking it over and over I got a tow and got all the extra gas cleared. Idles fine revs fine and sounds good in neutral. ---Still won't start from a kick and when I put it in gear after the tow, let out the clutch, it dies under the load.?

Just some extra info on this.

Cleaned the Carb

Put a new spark plug in

Another note... the seller said that he had recently put new rings in the bike.

My initial thought was...

1. rings / compression problem

or

2. timing chain jumped

I've been trying to help troubleshoot over the phone, but it is stumping me how it can run and rev in neutral, but won't stay running under any kind of load.

Any ideas? - Clutch?

If the bike ran fine all that time and then all of a sudden started acting up I would think maybe dirt in the pilot circuit? Check all your electrical conn.

and the plug cap for resistance (coil) sounds like dirt though..

If it starts and idles, the pilot circuit is good. The main circuit is another matter, though, and this could be something as simple as a drop of water in the bottom of the float bowl. A needle clip falling out will do the same thing.

Another thing that will do this is weak ignition or a partly shorted plug. As you increase the load, you increase the dynamic compression in the engine, and that increases the electrical resistance across the plug gap, "blowing out" the spark. A plug, a leaking coil wire, or weak ignition energy due to a faulty component could be the root.

Look in the carb first.

I would change your spark plug. You just flooded it.

If spark plug doesnt work, um....... check your muffler bearing :thinking:

Muffler bearing checked out - plenty of grease. Talked to he young mech. here that had a 426, he thinks the clutch is shot. We'll see.

Better talk to a different mechanic. A total failure of the clutch would not prevent the bike from starting. That's dumber than removing the rear wheel because the front is flat.

Better talk to a different mechanic. A total failure of the clutch would not prevent the bike from starting. That's dumber than removing the rear wheel because the front is flat.

Grey you are the best :thinking: !

Just an update. Talked to tjpop. Appears to be a wore out timing chain. Looks like it jumped a tooth (probably reason original owner changed the rings) but still ran ok enough on the purchase ride. The seller had to know there was still a problem with the bike, but too late for that. Looks like it jumped a few more teeth after the second ride and then wouldn't start. It gets out of the shop in a few days.

Need Help. Last week I purchased a 01 426 and the thing ran beautiful when I was testing it out so I packed it up and brought it south to KY to ride over the weekend. I get here and the thing fires up on the second kick after a five hour run at below 30 degree temps I ride it around for five-ten minutes then I stalled it from a stand still. I used the hot button it fired right up and like a chump I stalled it again -from a stand still.:thumbsup: Now no fire. I finally figured out that like a newbie I flooded it. After my leg wore out kicking it over and over I got a tow and got all the extra gas cleared. Idles fine revs fine and sounds good in neutral. ---Still won't start from a kick and when I put it in gear after the tow, let out the clutch, it dies under the load.?

go to your manual and set the accelerator pump - the manual will tell you how to do this, acc pump may be so far out of adj, giving it too much fuel. - also your tps could be off.......

The timing jumped 6 teeth. Now it runs just fine. It sat for 3 weeks and started on the 3rd kick. :ride: - Just for the record and to all other newbies- if you follow starting procedure and your carb is tuned half way decent, the 426's are not that hard to start. Nice bike and plenty of grunt. :p

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