Tecate problems update

[250sx]

Well I TRIED to run the T3 this weekend, but it didn't work out. I got a clamp-on UNI filter since this 38mm Mikuni flatslide won't fit into the airbox boot. My airbox doesn't have the straps to pull it onto the carb, but it wouldn't have helped anyway. This thing isn't even close to fitting.

Anyway, I said screw the airbox...I just wanted it to run. I finally got everything set to go and it would NOT kickstart. We had to pull start it when it was cold. Even then it took a LOT of pullstarting to even get it to "run." Once it was running it was missing REALLY bad. You couldn't hardly give it any gas.

Once it warmed up it would idle ok. When you try and take off it doesn fine at low rpm, but as soon as it gets to midrange and starts to hit the powerband it falls flat on its face. I mean the engine practically shuts completely down. It coughs, sputters, and damn near dies.

One of the guys said it sounds like it's detonating. I don't know what a 2stroke sounds like when it's detonating so I don't know...although a couple months ago when I first rode it this didn't happen.

I also tried swapping the identical carb off of 200x_basket's 250r and it did the same crap.

One thing I should mention is that there's a small crack in the case at the flywheel cover from when the flywheel let go (before I bought it). I haven't patched it yet and the bike sat in the rain for a few days. When I went to run it after that I noticed water coming out of the hole while it was running. I took the cover off and the stator & all had some light rust where apparently it had been about 20% full of water.

However, after this I rode it again and it was acting normally. Then I fooled with the idle mixture and it lost all the power. Shortly after that is when it wouldn't crank at all by kickstarting (it used to start on the 2nd or 3rd kick every time). That was a couple weeks ago and between then and today I hadn't tried running it.

Any ideas? :cry: :cry: :cry:

[atc330r]

so this carb is also new to this motor, you didnt say? the honda s carb wont be jetted for yours. on the ar box alone it will have to go up on the main, but the mid and to end sounds like main jet is to small. same with the slow side (jet). clean up the stator. get jets?? go up on the main till it wont run on the hi side then up back down till it smooths out. you will know when yo have the right jet in it. jb weld the crack.

[ATC_250SX]

My cousins rm 80 did exactly that and it was to do with the carb. The only way you could start the 80 was to pop start it and then it would run ok but when it hit powerband it sucked and it sorta idled but not reallt, it turned out to be too much fuel but that was because of a diffrent thing, but it dose sound like a carb problem.

[turbo]

ok, dumb question, how are your reeds?? are they bent out of shape? im agreeing with the jets, i had a similar problem with my tecate in the winter when it was cold, but as soon as it would warm up it would fly. also, what kind of fuel are you running threw it? if you have just alittle water in it, since it sat outside, gas tank might have alittle in it. and in the winter mine would do those exact same things when i got frost in the carb from it sitting outside, then warm it up, frost turns to water= not run right.

[ATC_250SX]

now come to think of it, what i said before didnt really match what was happening all the way, but i do remember my snowmobile doing almost that, hard starting, i would have to jump start it of my truck to get it cranking fast enough to start and ran real bad, and it turned out to be an air leak causing my problems so, you may have an air leak, i would check all the inteak points like the boots and whatknow for any spat air could enter where is shouldent.

[250sx]

Great, either I'm getting too much fuel or not enough. :doh: Just kidding, I appreciate the comments.

It didn't detonate on the first ride I took with premium gas so I don't know why it would start now.

The carb is super-tight to the intake boot, which I know is tight against the reeds & jug. Since there's just a filter clamped onto the carb & no airbox then there shouldn't be a problem there.

The reed are brand new boyesen 2stage reeds that I checked & had 2 other people check & they are ok.

The 250r has roughly the same mods as mine (pipe, silencer, K&N, good reeds, etc.) so it should have roughly the same airflow needs I would think. Regardless of that, the T3 is doing exactly the same thing it did with the carb I had on it.

Oh yeah, the tank was completely drained and refilled before this latest ride so I know there isn't any water in there.

[ATC_250SX]

yeah sorry didnt mean to confuse you, probly should have deleated my first post, My bad.

[MIK6]

Dan, Mine did the same thing. I searched and searched for quite some time. Here is what i did to fix it. Pull the ignition plug, the plug that comes from the stator and goes to the wiring harnes. Look for ANY rust or sign of a poor contact. Clean it up, open the spade connectors and put some electrical goop in.
Now if that does not fix it, it might be the stator. It sounds like a miss fire problem prob related to water or a poor contact somewhere. Once this happens the powervalve gets gumed up and is not opening /closing properly. Send me your address and ill send you the powervalve info.

LET ME KNOW HOW YOU MAKE OUT
MIK6 / Mike

[250sx]

I did find one connector that was hanging by a few pieces of copper a couple days ago, but I fixed that one. I'll have to go back over everything later this afternoon.

How do I get the stator off to check it? What do I clean it out with? I kinda thought that if it ran at all the spark wasn't my problem. That's not the way it works?

[ATC_250SX]

did you say before the mag blew off it??? it could be outta timing, or the timming coil (dont know what the real name of it is) could have been damaged durring the blow off. or the stator could be damaged. you said there was water in there? maby the magnets and the coils have some slight rust that would make it have poor spark.

[250sx]

All that was replaced before I bought it. I've run since then and it was fine. It's just not acting right anymore.

[86waterpumper]

dan did you try putting your old carb back on it?? I know you mentioned doing it over the weekend. Just was curious if that helped any at all

[HondaATC500X]

With any engine, (More so with pingers then thumpers) when you change the fuel/air mixture the slightest bit, you should re-jet the carb. A new air filter Would definetly change the mixture. As would removing the airbox. Heck, CLEANING the airfilter will change the mixture but just not as drasticly.

The Reedcage design/exhaust ect. is very different between the 250R and the Tecate. If a carb from one could go to another with none, or even very little jetting changes I would be suprised.


In your case though I'm going to say its not the carb, and go with an electrical related problem. The Engine would not be acting this way if a re-jet from removing the airbox was the only problem. You would be leaner, instead of having poor throttle, and a lack of power if that were the case. Unless the carb you put on it was severly out of whack. If it runs the same way with the old carb, then I doubt that is the problem.

There are alot more people around more educated on Tecate electricals then I am, But I am going to diagnose it as a weak, or irregular spark. Could be either one, could be both.

[Unregistered]

I own a 85 tecate and I had electrical problems, it turned out to be my stator here are the ohmn reading that the stator should have. my service manual has the spec fot the cdi, but tis not very clear. if your stator is good, let me know the readings on your stator and I will compare them to my brand new neer used one.

stator:

bk-bl 170-250
bk-w/r 185-280
bl-w/r 20-30
y-bk .47-.71

if the stator is bad, ricky stator sells the coils and he sells new stators for $120. the wire going to you stator is gonna be a three prong with one metal tip and the other two will be in rubber and will have a yellow wire on it,this is for the lighting coil.

Another thing, did you ckeck your compression, after I replaced the stator, my tecate still wouldn't start and I had 80lbs of compression(still waiting to get cylinder back from getting resleaved) I hope this helps, if you need additional help email me: deathman53@hotmail.com