With your problem being heat related the first thing I thought of was the coils. I have seen coils that will ohm fine when cold, but will mess up when they get warm.

You might also try a new set of spark plugs, and ohm out the plug wires just to be sure they are OK. They could be breaking down when hot.

These kind of problems are a b**ch to isolate. Try the simple stuff first.

Does it miss if you bring the RPMs up slow or just at full throtle?
I don't know what code 17 is! It is not listed in the service manual.

 

harley Thanks but tried that checked the coil and replaced plugs and checked leads

and no it makes no difference whether you bring the revs up fast or slow when it hits 3k the ignition cuts out

 

Does the dealer have another ECU to swap out and try? Illiminate that and then check the other sensors.KC.

Warrior meet in Sturgis! See Ride Club forum.

 

I know the ECU can be affected by temperature because sometimes when my bike gets hot and is parked for a few mins, the speedo will go completely haywire. I have to ride a few miles to cool it down, stop, turn the key off and back on. Then when I start it the problems gone. I do agree with Harley though, these problems can be a real son of a beach. Coils were the first thing I thought of also. the other thing that might be worth checking is the pick up sensor for the electronic ignition.

 

KC...He doesn't have another ECU but is prepared to get one in for me but wants to make sure there is nothing he has overlooked as if it is not the ECU he may not be able to return it to Yamaha and as I am the only one with a warrior.
Meatball if the pick up sensor on the ignition was playing would it do it at exactly 3K RPM only and not under those RPMs ???

 

If it does turn out to be the ECU I would assume a speedstar ECU would be a nice little performance upgrade to go with the HC pistons

 

I would be all over the ECU. I'm betting thats what it is. I see your down under. How hot is it outside now? Are there no other Warrior buds around? You could swap out with theirs?

 

quote:Originally posted by ICD55

I would be all over the ECU. I'm betting thats what it is. I see your down under. How hot is it outside now? Are there no other Warrior buds around? You could swap out with theirs?


The nearest warrior bud I talk to is in Perth about 2000 miles away and we are in winter now its only about 65F

 

I agree, it must be the ECU. I can't see any of teh sensors dropping out at a set rpm. That has to be the computer.

 

Sounds like ECU to me, I'm an electrical engineer, and it sounds like a thermal intermittant problem. I have an extra stock ECU if you need I could FEd-Ex to ya.
Good luck,
Ross Daniels
San Jose, California

 

i had the same problem with another bike. i used a hair dryer to locate the problem. turned out to be a main electrical relay. after heating it up it failed. when it cooled off it was fine.

 

You can use the hair dryer method or there is also a product/s called 'cold shot' which is used to test for faulty electronics or sensors. If you get your hands on some or something similar you can shoot the ECU and cool it off when the bike is warm and see if the problem goes away. If it does and comes back again when the ECU gets warm again then that should be a pretty good indication that the ECU has a temprature related problem(e.g. faulty electronics) and needs replaced. Hope this helps.

 

Hair Dryer/Cold Shot is the way to go for diagnosing electronics problems. Have you looked at the Rev Limiter? Good Luck.

 

Hey...cold shot sounds interesting. Would canned computer-air work? It is probably easier to just go to the store and pick some up.

 

canned computor air? is that anything like a bucket of steam?. i like the cold shot idea. easier to isolate already hot components.(ice-o-late)

 

Thanks guys will try the hot and cold thing just down loaded the entile manual and printed it out....lucky my company has a printing division I printed the entire 515 page double sided the resolution is great.

 

You can use freon to chill it. 134 at Wally World is about 5 bux a can. They sell the charging hose kit also but everybody in FL owns their own charging hose. Well not everybody, we get a lot of northern tourists who are used to opening a window for cold air. suprise, suprise, suprise.

 

OK if it turns out to the ECU and I do a deal with Yamaha on replacing it with the competition ECU what other benefits will that give me....besides taking the RPM limiter out to 5.5 RPM

 

OK back to the problem.... The ECU seems to be OK have also changed the engine temp sensor..still same problem wot the F*ck is going on here. any suggestion would be appreciated

 

You have an injector going out , my bikes the exact same way .. welcome to middle of sept. delivery time

 

not sure what sensors the warrior uses, but on a car an crank sensor can cause this exact problem. I don't know if you have a lab scope but this would be a good place to check. The crank sensor tells the ignition when to fire and a faulty one is most cetainly affected by heat.

 

Reverend Doctor, can you explain this in a little more detail...is there an injector sensor controlling this ???

 

The injectors sit on the sides of the throttle bodies. No sensor there jut the injectors themselves. They are electronically controlled and could be the problem. The crank sensor might be another reason.

Hope you find this problem soon!

 

Well get this no crank sensors in the country [/emoticons/emotion-6.gif!]...this is just great

 

This has to be all covered by warranty. Tell the dealer to have Yamaha air ship it at their expense!! This has gone on for far too long.