a.craw4d's CBR 250

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So after this,


And this,IMG_20190814_125132.thumb.jpg.76077a11796c2542afd51f206cb23a55.jpg



And a bit more after those photos were taken.



I have a tank that keeps petrol on the inside.

Excited to finally take this for a hoon I chucked it all back together.

Cranked it up and found this,





Floats must be stuck, fuel was fair pissing out of the carb overflows :(

So gutted. Still really excited to go for a hoon though.  I'll drop the bottom off the float bowls and hopefully get them sorted easy enough.

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Also, this is my fuel valve.

Its been so long I can't remember which bit the vacuum line goes onto.


I'm thinking the one on the left?

Thanks people in the bike spam thread, left port it is.

Edited by a.craw4d

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I'll keep this short as there's no pics.

Gave the bike a good shake just in case it loosened up the stuck floats, nope.

Dropped the bottom off #2 float bowl and found it stuck, got that freed up and checked #1 and 3. Both of those were ok but different. Back to #2 and turns out not only was the float struck but the little needle valve attached to the float was stuck. Fixed that (I think). Couldn't get at #4 easily so left it and tried my luck.  Still overflows.

Think I'll just pull the carbs right off and give them another going over. The rubber joiner bits are new so should come off easily this time, I hope. There was a little crap and green varnish? in the float bowls and around the needles so they need a clean. Seems odd though as I've had them all apart, cleaned and new seals.  Have also sat for quite some time so who knows. Next weekends job.

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Feels like I've been here before.


Starting with the diaphragm side just in case fuel was making its way up there. It wasn't luckily. The needles on numbers 1 and 2 were a bit green but it polished off with some autosol easily. Will hopefully drop the floats out tomorrow then take it to work and give it all a good blow out.

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Float valves were stuck on 1,2 and 4.  Bottom of the bowls are stained green, gave them a squirt and soak in carb cleaner but doesn't come off.  Is it ok to leave or will it loosen up in time and block shit up?

Anyway, pics or it didn't happen.



One stuck valve covered in snot (is it called a valve? I'm just naming bits as I feel).



All the floats and valves out. Will take the main carb assembly to work and give it a blow out.



And the bowls after I've given them a quick clean.


Will try scrub out the bowls with something, don't know what yet.


Is there a way to stop all this happening or is it just a case of not letting it sit for too long between runs?

Would appreciated some direction.

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10 hours ago, a.craw4d said:

not letting it sit for too long between runs

AFAIK Thats the way, and fresh fuel, ie dont leave the same fuel in the tank for years

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