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By TimothyLindblom
Hi everyone, I’m new here and new to 4 wheelers. Just got a Yamaha bear tracker 250 and joined here to see if I could get some help.
The motor runs and it drives if it up on jackstands but if you get on and try to ride it, it starts to drive but then quits after a foot or two and dies out and won’t drive. The guy I got it from said he was running and using it shifting through all the gears great and he started it up the next day and it started this.
He told me he thought it was the U joint on the driveshaft. He said it was probably worn and needed to be replaced.
I just finished pulling the swing arm and rear end assembly to check out the U joint and there’s no play in it. It’s tight and not nearly enough play to be loose enough to not catch and go.
Any ideas on what it could actually be?
Thanks
Timothy
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By heath
i just bought a yamaha moto 4, i have sprayed 'start ya barstard' into the carb and on the spark plug and it doesnt even fire! although when i have the spark plug on the outside of the motor it shows spark, the engine also leaks oil from the starter,
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By Banshee898
2014 Honda Rancher TRX420TM1: Unit starts right up, once it warms up it stalls and more difficult to start but once it does start it won't stay running. I have replaced the fuel assembly, IACV, O2 sensor and fuel injector. There are no active DTC codes. Disconnecting fuel line at injector and turning on key there is a steady stream of fuel. Plug looks good did not see crack in ceramic. Is there any way to test the ignition coil?
Thanks for any help.
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By Brantley11
Hey everybody,
My proficiency is with Hondas and Yamahas make me see RED!
This bike is my brother in law's, it has 1199 miles on it and went from running great to dead with no start. Every once and a while it will start and sputter for 2 seconds. It is extremely sporadic when it fires but never runs for longer than 3 seconds.
Here is where we sit:
Brand New Fully Charged battery
Carb was cleaned with air hose and carb cleaner then into the ultrasonic cleaner with Aircraft aluminum cleaner
New Shindy Carb kit (made in Japan version)
Cleaned out petcock and gas tank
New 93 Non Ethanol Gas
New Spark Plug
It gets a spark through the spark test light every time
Bluish white spark
When holding the spark plug 1/4" - 3/8" away from head it will jump and spark to the head
Good Compression
Here are the readings:
Pickup Coil 519 Ohms (range 459-561)
Charging Coil 266 Ohms (range 270-330)
Lighting Coil 0.700 (range 0.702-0.858)
Spark plug Cap 10.58 Ohms (10kohms
Ignition Coil Primary Coil 0.5 ohms (range 0.18-0.28 ohms)
Ignition Coil Secondary Coil 8.20 kOhms (range 6.32-9.48 kOhms)
Would y'all think stator and pick up coil, rectifier or CDI are the culprit?
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By WyattLemke25
Working on a 2016 Sportsman 570 and it has a new battery and spark plug. No codes, fuses all look good. It cranks for a while and when it starts it will only run for a few seconds before stalling. At one point it was running at 3000 rpm with no throttle input, then it dies. Not sure where to look besides messing with the throttle cable, so suggestions are appreciated, Thanks.
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