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Hey guys I have a Yamaha moto 4 250 that was running great now all of a sudden I have low power. It starts up and idles great and engine sounds fine no knocking or ticking or anything like that. I can ride it and sometimes its like you flicked a switch and the power comes back for a minute and then it goes away again. I've changed the spark plug, cleaned the carb and it made no difference. I'm thinking the stator could be going bad but id like to find out more before I spend the money on it.
By silly sloth
I have 2 1985 Yamaha yfm 200s the yellow bike runs great plug is nice and brown nothing worng with it the black one however runs like a bag of ass it Spitz out the carb it sputters runs real hot it's lean I know that but it literally has the identical carburetor every part of them is identical inside and out and no matter what I down I can't get it to richen out rather burn a whole lot of gas then burn the piston
Just purchased one of these and I have a few questions: Went to change the air filter and it fell apart, but there were two pieces of the foam wrapping the wire cage - Normal? In addition there was about an inch of oil in the bottom of the air filter box - again - Normal? The backing piece of plastic for the wire cage was laying in the bottom of the filter box and the bolt was also in the oil. I am also looking for a recommendation on what to do with the machine as far as maintenance, it runs well, shifts fine, needs a new battery, but what else should I be checking? The previous owner had it for over 25 years and does not have any records or memory of the last oil change or any other maintenance other than needing to replace the battery a couple of years ago and placing a car battery on the front rack and running wires to the starter. Learning curve is sharp, but looking forward to the experience. Thanks for your input.
Any luck with manuals?
I need a carb in the owrst way and am have gone down a lot of rabbit holes (over 90 tabs and counting). Factory calls for a Mikuni BST34/1 (I think, but need to check manual). I don't care what or who makes the carb, just need a basic reliable carb. No Racing etc, just puttering. I currently only have the cable with the round slide attached.
Don't care if its round if I know what other parts to get to make it all function.
Thanks for help, and listening, gonna go chase more rabbits I guess.
Bought an old Yamaha (Moto 4 250) and the thing won't start.
It will start with choke full on - but close choke and it'll die. If you give it gas - it dies.
It will take throttle with choke on (and smoke like a chimney).
When I first got it the thing would start periodically - but again soon as you give it throttle it died.
I took the carburetor off and cleaned it all with carb cleaner and a tiny piece of wire (to get into the holes) I checked the float levels (good). Has spark.
What else could be the issue? I can safely say the carburetor is 100% clean - the pilot mix screw is set where it's supposed to be set (1 3/4 turns).
Driving me nuts.
I took the air filter off and cleaned and oiled it (would over-oiling the filter choke it from getting air?)
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