Leaky carb cr250

[Sharky]

So i got me a cr250 for a good price. Bike rips, but leaks out of the carb overflow. I figured it was a sticky float. Took the bowl off the carb, cleaned it and made sure the float moved freely.
Reassembled and its still leaking albeit not as bad.

The bike was sitting for a while and there was some grime in the bowl. I figure theres more dirt in there or something hanging up the needle valve.

Anything im missing?

I am going to ride it a little and see if i can flush out whatever is in there. Then, if thay doesnt work, pull the cardlb completely out and do a full clean.

 

[motomania2007]

3 likely possibilities:
1) float height is wrong or float no longer floats
2) rubber tip of float needle valve has failed - gotten hard or pitted
3) I can't recall for sure for that bike but many float needle valve seats are removable and underneath the seat is an o-ring that can harden and shrink and or disintegrate and leak

I suggest pulling the float bowl, connecting fuel source to the carb fuel inlet and then push the float up to see where fuel is getting past the float needle valve

 

[Sharky]

3 likely possibilities:
1) float height is wrong or float no longer floats
2) rubber tip of float needle valve has failed - gotten hard or pitted
3) I can't recall for sure for that bike but many float needle valve seats are removable and underneath the seat is an o-ring that can harden and shrink and or disintegrate and leak

I suggest pulling the float bowl, connecting fuel source to the carb fuel inlet and then push the float up to see where fuel is getting past the float needle valve

Thats a great idea.
Its got to be something in that circuit

 

[OaklandF4i]

Congrats on the addition of the CR Aaron. Two in the garage now eh! :thumbup

You aren’t missing anything and you will get it sorted. The only experience I’d share is my shade tree non manual approved approach to old hardened float needles. I’ll sometimes take a very light swipe with very fine grain wet/dry sand paper on old hardened tips. Not like you are sanding, but lightly wiping it off just enough to get the old hardened crust off and reseal. Best to replace, but nothing to lose if not sealing.

Make sure the seat is really clean and smooth, doesn’t hurt to soak it to make sure. Failing float hasn’t happened a lot in my experience, but easy enough to certify. Don’t set it artificially low to compensate for it leaking as you could induce a lean condition.

 

[Sharky]

Turns out I fixed it the first time or the needle valve cleaned itself off. No more leaks and she rips!

Thanks for the good ideas and encouragement!