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79Truckster
11-29-2019, 11:51 PM
I have a 1985 YTM225DR and it is acting strange. I just bought it and it ran fine when I went and checked it out, now it’s running okay when it’s cold but as soon as it gets warm it doesn’t idle at all but will run like normal above 1/4 throttle. I have messed with the carb and set it back to 2 turns out along with cleaning. I have replaced the spark plug and flushed the gas tank. It has plenty of compression but needs valve seals as it smokes a bit. Does anyone know what it could be? Thanks

El Camexican
11-30-2019, 04:48 PM
Are you sure the choke is off when it gets warm?

79Truckster
12-01-2019, 11:01 PM
Are you sure the choke is off when it gets warm?

Yes, Choke is off.

El Camexican
12-02-2019, 12:20 AM
If you’ve removed the choke plunger and are certain everything is in order, then let me ask how much adjustment is left on the idle screw? Could it be as simple as that you need to turn it up?

Poor running at low rpm is often a sign of a plugged pilot jet, but the choke circuit can add enough fuel to compensate for it to an extent.

Is there a period of time between when you close the choke that it idles well before it stalls, or does it stall as soon as you close the choke?

At the point that it doesn’t want to run without throttle have you tried opening the choke to see if it helps, or makes things worse?

Is your float height correct? 15mm if I’m not mistaken, but don’t take my word for it.

It sure sounds carburetor related. Don’t take this the wrong way, but there are people who consider removing the float blown and cleaning it out “cleaning the carb” when the really is that you must disassemble and clean all the jets and holes. Not knowing exactly what you’ve done it’s hard to guess what the problem might be, but all indications are that it’s related to the idle circuit of your carburetor.

79Truckster
12-02-2019, 07:17 AM
If you’ve removed the choke plunger and are certain everything is in order, then let me ask how much adjustment is left on the idle screw? Could it be as simple as that you need to turn it up?

Poor running at low rpm is often a sign of a plugged pilot jet, but the choke circuit can add enough fuel to compensate for it to an extent.

Is there a period of time between when you close the choke that it idles well before it stalls, or does it stall as soon as you close the choke?

At the point that it doesn’t want to run without throttle have you tried opening the choke to see if it helps, or makes things worse?

Is your float height correct? 15mm if I’m not mistaken, but don’t take my word for it.

It sure sounds carburetor related. Don’t take this the wrong way, but there are people who consider removing the float blown and cleaning it out “cleaning the carb” when the really is that you must disassemble and clean all the jets and holes. Not knowing exactly what you’ve done it’s hard to guess what the problem might be, but all indications are that it’s related to the idle circuit of your carburetor.

Thanks so much for this response! I have stripped the carb down the carb body and cleaned all circuits. The choke plunged was removed and I removed all of the scores with 3m pad. The idle screw bearly has any adjustment left. I don’t have a service manual so I set the float to where it would just clear the pilot. I can try and set it to 15mm? It has to be carb. I ordered a cheap Chinese carb just to see if it helps. It has stock jets. There is a point if I ride it for 10 minutes where it idles really high then goes back to stalling. There is points where it seems to ride better with half choke but always bogs when given throttle. It would be easy if there was a constant problem but there’s so many different problems I can’t figure out what is going on.

El Camexican
12-02-2019, 09:44 AM
I’d skip the cheap Chinese carb and send yours to a guy on here that goes by Flyingw for a rebuild. It might cost more than the knockoff carb, but it will be worth it in the long run.

As far as float setting, please lookup a how-to video. I will try to confirm the height this evening.

Also, are you sure your throttle cable is in good shape and not binding at all?

El Camexican
12-02-2019, 07:36 PM
Here’s what the Clymer manual says.

260898

260899

260900

260901

260902

260903

czac
12-03-2019, 04:09 PM
When i bought mine it had an Ebay cheap chineese carb on it, it would start and run but if it stalled or I shut it off, that was it, it would NOT start again until it got cold again. (theres a post here someplace that tell all about it.) but I believe i replaced the main jet with the original one (the old owner gave me the original carb with the trike) and it ran fine after that.

czac
12-03-2019, 04:20 PM
here ya go... http://www.3wheelerworld.com/showthread.php/167553-1985-YTM-225-DXN-Carb-Questions?highlight=ytm+225+carb