YZ400 WR Carb Problem,Too much gas.
Posted January 26, 2002 - 11:12 AM
Just woundering if anybody had this problem and knows how to fix it.
Thanks for any help.
Posted January 26, 2002 - 01:17 PM
A choked airfilter will cause the same symptoms, or a rag in the inlet boot?
or is the choke circuit stuck on
right thats me out of ideas!
[ January 26, 2002: Message edited by: Guy ]
Posted January 26, 2002 - 03:43 PM
And also the bike kind of bogges a little at first if you give it some good revs at idle. And full open it kind of cuts off or something like that. And also I for got to mention was that some times you get a loud back fire when you try to start it.
thanks for your ideas
Posted January 26, 2002 - 04:22 PM
wow, I am having the exact same problem with my bike. It just started happening the last five weeks. I've experienced all you wrote even the backfiring when just started. Never had any problems before, always started on 1st or 2nd kick, but now I have all these problems. It'd be great if we could get this figured out together. My bike is slow to rev, which really sucks on the track. What to do? Any insight from TT's out there? Thanks
Posted January 26, 2002 - 06:42 PM
Posted January 26, 2002 - 07:24 PM
Also I have heard of some problems with the pump actuating devise being dirty and not allowing the pump arm to return as quickly as it should.
Posted January 27, 2002 - 05:29 AM
If the carb checks out, check the TPS with an ohmmeter. Make sure it's in spec. just because it's easy to do.
Have you checked valve clearances lately?
Have you done anything to change the ignition timing?
Posted January 27, 2002 - 05:28 PM
Posted January 27, 2002 - 10:17 PM
APJ squirt timing ?
Posted January 28, 2002 - 09:16 AM
Thanks guys. I'll let ya know the results. Good luck Jim with your bike.
Posted January 28, 2002 - 01:51 PM
Posted January 28, 2002 - 04:30 PM
Posted January 29, 2002 - 06:43 AM
In my experience its been smartest to start simple, overcomplicating carb problems is common. Here are some "simple" things to try;
1. Turn your fuel screw in and count the number of turns. Turn the screw 1/2 turn further out than it was. Continue to try 1/2 turns until you've reached 3 turns. If the problem isnt solved turn it back to the original # of turns.
2. Check you float level again. Most YZ/WR's run better with a slightly lower float height than stock and you get better mileage!
3. Make sure your air filter is clean and NOT wet.
4. Lastly clean you accelerator pump.
Posted January 29, 2002 - 10:33 PM
Originally posted by Mr Toyz:
Remember cold or wet weather will make bike run rich.
Cold weather LEANS the mixture.
Mr. Toyz' suggestion of adjusting the fuel screw OUT will RICHEN the mixture. I don't think you want to do that if you already are backfiring and giving symptoms of richness.
I tend to discount the fuel screw and mixture as the source of your problem. Particularly if it is colder now than when it was running well. It won't hurt anything to try it though!
Others on the board have had the valve clearance cause this symptom. Check it. It's easy to do..
Posted January 29, 2002 - 01:50 PM
Posted January 29, 2002 - 03:54 PM
My `98 has been spared these problems so far. But it hasn't been ridden as much since the 02 arrived.
Posted January 29, 2002 - 06:09 PM
I think your on the right track with the valves. Mine got tight pretty fast.
Posted January 29, 2002 - 10:53 PM
Posted January 29, 2002 - 10:57 PM