Hey guys, I just bought my first two stroke, I rebuild the to end yesterday, put in a new piston rings and gaskets. Mixed my fuel and kicked her over. The bike started sounded good, then started rev high for about 5 sec. It seems to start revving high erratically. When this happens I can turn it off. Would this be a carb issue? I never touched the Carb, I'm thinking about throwing some seafoam in it.
Any sugggestions?
RM250 97 sporadic/erratic throttle
Started by
sigops
, May 07 2012 06:30 AM
17 replies to this topic
Posted 07 May 2012 - 03:02 PM
I just notice the carb spits out gas, one I start kicking the bike over, its stops leaking. When I stop kicking it over, its start to leak out of the res tube. As if the float is overflowing.
Posted 07 May 2012 - 03:55 PM
Sound like the float shut off valve is bad or dirty. Pull carb off, remove bowl, turn gas on (with container under to catch gas), and lift up on float. The fuel should stop flowing. It would be a good time to clean it while you have it out too.
Posted 08 May 2012 - 02:09 PM
I removed the carb and measured the float, put the carb back in, does the same thing. Now I just read your message Tailender. What is the float shut off valve? is that the cone shaped needle that is hooked up on the float?
Posted 08 May 2012 - 02:20 PM
i saw the same thing happen to the same bike. but it just ran the last bit of fueel out of the bowl. i think it gets extreamly lean
Posted 09 May 2012 - 02:28 PM
i would think you are running lean. pull the carb and see if when the throttle is closed it is acually closed. what are the jets in it? i would reset the float while you are in there and clean the needle and seat. if it revs really high a eratic it sounds like it is lean or running out of gas .
Posted 10 May 2012 - 05:37 AM
Thanks for all the help guys. I've taken my time and really cleaned it out. Then I measured the float and it was about 13mm off. wow. Anyway, as per manual, I measured the float, place it back in properly and now she purrs like I just bought it from the factory. Thanks for input, I love this site. Can't wait to go riding again. So ... float was way off set. I think someone was in there before me trying to fix it.
Posted 18 July 2012 - 12:47 PM
sigops, on 10 May 2012 - 05:37 AM, said:
Thanks for all the help guys. I've taken my time and really cleaned it out. Then I measured the float and it was about 13mm off. wow. Anyway, as per manual, I measured the float, place it back in properly and now she purrs like I just bought it from the factory. Thanks for input, I love this site. Can't wait to go riding again. So ... float was way off set. I think someone was in there before me trying to fix it.
Posted 19 July 2012 - 02:37 PM
ok thanks. do you remember your pilot jet size? and how turns on the pilot screw? do you have an aftermarket pipe? thanks
Posted 24 July 2012 - 06:42 PM
sigops, on 08 May 2012 - 02:09 PM, said:
I removed the carb and measured the float, put the carb back in, does the same thing. Now I just read your message Tailender. What is the float shut off valve? is that the cone shaped needle that is hooked up on the float?
watch tht cone valve. if u dont put it in exactly right it will cause ur bike to run wide open. same thing happened to mine. it idled high once like u described i took bowl off. and adjusted the cone thing. then it idled right. took it apart one more time. to clean jets. didnt put cone thing in right. nd the son of a gun came alive and screamed bloody mary! wide open. make sure that cone thing is completely rested in the hole and completely free
Posted 25 July 2012 - 08:54 AM
sigops, on 10 May 2012 - 05:37 AM, said:
Thanks for all the help guys. I've taken my time and really cleaned it out. Then I measured the float and it was about 13mm off. wow. Anyway, as per manual, I measured the float, place it back in properly and now she purrs like I just bought it from the factory. Thanks for input, I love this site. Can't wait to go riding again. So ... float was way off set. I think someone was in there before me trying to fix it.
Posted 25 July 2012 - 11:45 AM
take a look at the manual, this is what got me confused, when I looked closely at the picture, you need to put that float at an angle. Just like the book says, then you mesure 13mm from there. Get a good measuring tool, you always need this when working on these bikes. Something digital prefered I would say.
I use one of these
http://www.canadiant...r.jsp?locale=en
I use one of these
http://www.canadiant...r.jsp?locale=en
Posted 27 July 2012 - 08:52 AM
sigops, on 25 July 2012 - 11:45 AM, said:
take a look at the manual, this is what got me confused, when I looked closely at the picture, you need to put that float at an angle. Just like the book says, then you mesure 13mm from there. Get a good measuring tool, you always need this when working on these bikes. Something digital prefered I would say.
I use one of these
http://www.canadiant...r.jsp?locale=en
I use one of these
http://www.canadiant...r.jsp?locale=en
Posted 27 July 2012 - 08:31 PM
I believe it was up, I bought the bike used. I believe someone probably measured the float having it leveled before I looked at it.
