Yamaha dt250 - strange battery ?

[truck6driver]

Batteries plus can get those batteries.
If I remember correctly there is a conversion kit for it too that will change it over to 12 volt but you will need to swap all the light bulbs out for 12 volt ones. If you plan to ride it alot I would look into that.

Ray

[pclem12]

Originally Posted by jordan325ic

Well, I found out the problem. He was mixing in 4 stroke oil instead of 2 stroke, so the plug was fouled. Replaced the plug, cleaned the carb, replaced the air filter, put new gas in, and she started right up.

Got to ride her around, and she is fast! Now there's either a throttle issue or an idle issue, because when I'm not in gear (clutch in or in neutral) she revs very high. Tach is broken, but it's way wrong. He thinks it's the throttle sticking. Also, that headlight SUCKS. Need to upgrade that if I'm every going to ride at night again.

all the time at idle, or only after having given it throttle?

[jordan325ic]

Originally Posted by pclem12

all the time at idle, or only after having given it throttle?

I only rode it for a few minutes, but it appears to only happen after giving it throttle.

Originally Posted by dan-c

I'd check to see if the throttle cable is sticking or not seated first. Check the top of the carb or check the junction where the injector and carb cable join

Also make sure when you release the throttle from wide open (engine off) that you hear the slide clearly seat. You could even have the slide in wrong. I know some people will say you can't do that with a Mik but DAMHIK

I did disconnect the throttle cable when I cleaned the carb. I suppose it's possible I re-connected it wrong, but he said there was a "sticky throttle" problem before I touched it. He says that giving the throttle a twist or two fixes it.

[jordan325ic]

Well, maybe it's not a throttle issue?

Today I rode the bike and twice I was coming to a stop with the clutch in and the bike started revving very high. Gave it a few tugs of the throttle and it just kept on revving, if anything it seemed to go higher (tach is dead so not sure exactly how high it was revving). So I hit the kill switch, it kept running like I hadn't done anything. I turned the key to the "off" position. Still kept revving. The only way I could turn it off was to stall it out by releasing the clutch suddenly.

Not really sure what's going on with that. Any suggestions?

[rightone1974]

Originally Posted by jordan325ic

Well, maybe it's not a throttle issue?

Today I rode the bike and twice I was coming to a stop with the clutch in and the bike started revving very high. Gave it a few tugs of the throttle and it just kept on revving, if anything it seemed to go higher (tach is dead so not sure exactly how high it was revving). So I hit the kill switch, it kept running like I hadn't done anything. I turned the key to the "off" position. Still kept revving. The only way I could turn it off was to stall it out by releasing the clutch suddenly.

Not really sure what's going on with that. Any suggestions?

I had the same problem with my dt250 and it wound up being the float level if not that it is your timing. mine would not idle because the jet was clogged then it would not get full throttle so i replaced the needle and seat then it ran great. they are good reliable bikes and durable and quick

[Dave in Wi]

Originally Posted by jordan325ic

Well, maybe it's not a throttle issue?

Today I rode the bike and twice I was coming to a stop with the clutch in and the bike started revving very high. Gave it a few tugs of the throttle and it just kept on revving, if anything it seemed to go higher (tach is dead so not sure exactly how high it was revving). So I hit the kill switch, it kept running like I hadn't done anything. I turned the key to the "off" position. Still kept revving. The only way I could turn it off was to stall it out by releasing the clutch suddenly.

Not really sure what's going on with that. Any suggestions?

I am no two stroke expert, but I believe that indicates that one of the crank seals are leaking. Letting in unmetered air and it continues to pull in gas through the carb even with the throttle closed. Someone with intimate DT knowledge can probably even tell you which side it is, as I recall one seal goes to the transmission, the other does not so that's probably the one leaking.

Why this happens even with the ignition off, I can't tell you. I have heard of it happeing and I'd like to know why myself.