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4/1/2008
Location
Valley, AL
US
Edited Date/Time
12/7/2018 3:45am
A couple months ago my son was racing his 2015 CRF250 and at some point a rock or something put a hole in the case and all the oil was lost. The thing overheated pretty bad.
We took the opportunity to do a full rebuild top and bottom end. We got it all back together and it will not crank.
My question is what electrical part it the most likely candidate to have suffered the heat stroke. We can spray ether into the intake and it will crank and run. This tell me it's a gas issue. We have swapped tanks from a known running bike so that eliminates the fuel pump. What should we try next?
Thanks,
We took the opportunity to do a full rebuild top and bottom end. We got it all back together and it will not crank.
My question is what electrical part it the most likely candidate to have suffered the heat stroke. We can spray ether into the intake and it will crank and run. This tell me it's a gas issue. We have swapped tanks from a known running bike so that eliminates the fuel pump. What should we try next?
Thanks,
Paw Paw
Car injectors a bit different than bikes as they deliver more fuel through larger holes and thus clog much less, where as the bike injectors have very small holes and clog much easier. Yes I have seen them clog up.
Paw Paw
The Shop
Paw Paw
Paw Paw
Concept - It does fire and run when you feed it ether. We also believe it is fuel delivery. Trouble now is just finding out what's causing it.
Thanks for the replies everyone.
The engine does need for the injector to operate when kicking it over or it will not fire.
Question.... When you use the starter fluid and it starts, does it keep running as normal or does it die quickly?
If it dies quickly, then you need to look at the fuel pump.
Paw Paw
As far as the fuel pump goes, we actually pulled the tank off a compatible bike that was fully functional and running and the issue persisted. Just so that we could rule out the fuel pump.
Also, if the ignition had any issues it would cause the bike not to start at all, Right?
Excuse my ignorance and thanks for your response!
Thanks for your reply. I assume you mean applying the battery to the ECU and making sure the voltage is traveling through the entire harness. How would you advise I do this? If I have an Achilles heel it is definitely in the electronic category.
Thanks guys.
Pit Row
GoYamaha
I have a quick questions. If I stick a volt meter into the business in of the injector plug-in would/should it show up on the volt meter. I know it would be a quick movement as you only get the power generated from the kick. And to check it would I just stick both ends of the volt meter in to either wire on the plug-in? Like the black lead into one hole and the red lead into the other side or do you stick the back to ground and then the red into the "hot" side? Like I said wiring is not a strong point of mine. We have a race next weekend and would like to get the bike running.
What all parts can actually affect just the injector spaying gas in the throttle body.?
fuel pump
injector,
ecu
??
Thanks guys
Gerald
We replaced the fuel pump with one of those quantum pumps and put in a new OEM injector. This was a swing and a miss but probably needed changing considering the age.
We also tested a functional condenser and rectifier. These were also a failed attempt.
At this point we are considering buying a new ECU or wiring harness (probably both). That is about all we can think of. Before we do that, is there anyway the stator just doesn't generate enough voltage to make the fuel pump and injector operate? I guess we assumed that if the stator is bad it's... well.. bad..Not halfway bad.. Any suggestions?
As always, thanks everyone.
Are all the parts that need a solid ground grounded?
Does the sparkplug get wet from all the kicking? Do you have spark? First the essentials need to be tested.
KB - Thank for the input. We know that the stator works to some degree considering it starts up with ether.
My question is: Does a stator ever lose SOME power or are they either good or bad? Seems like either the ECU is bad or the voltage generating from the stator isn't high enough to operate the Pump/Injector.
You can test output voltage of the stator to see. Or find a $30 magneto off ebay and give it a shot.
I tried messing with this evening. We know it's a fuel problem. We now know it's not the fuel pump, injector, condensor or rectifier. I was using my volt meter to today along with the manual. Granted I am not good with electrical stuff at all.
I test the kill switch and it's fine (someone had mentioned it). I think attempted to test the stator. upon checking the resistance of the stator with the white and yellow wires I got a resistance of 0.01 ohms. My question is did I do it right.
The range is .0.1-3.0. So a tenth to three. I how a one-hundredth on mine.
I am going to put a couple with and someone tell me if I had it set right. If so, does this seem to be my problem. Remember this engine was ran hot (very hot).
Thanks for the help guys.
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