Help! Tzr carb flooding

[swingermike]

urgent help please.

I am a very amateur mechanic and have been trying to fix my TZR 125's crap fuel economy. I thought there was leak from the fuel tap so have removed the tank, checked and cleaned it which seemed to be working ok. Next i removed the carb, adjusting anything is beyond me so i blew air through the jets, had a clean up and replaced it all. Now the bike starts but after about a mile it cut out and wouldn't restart. Annoyingly there was petrol pouring out from one of the breather ? pipes that come out of the carb and lead out towards the rear wheel.

Could any body suggest what has happened. I've gone from a small leak to a huge gush and in one easy carb clean. It seems that the petrol only comes out when the engine is turned off but i can't be sure as that was only a quick roadside check.The bike is currently chained to a roadside fence, very vulnerable so i am hoping it will restart to get me home.

any help much needed, i may be able to locate which tube exactly it is coming from andif it only happens with engine running tomorrow but any interim help would be appreciated.

cheers all
Mike

[Kickstart]

Hi

Floats stuck, or some rubbish in the needle valve.

When you take the float bowl off there are a couple of floats. As fuel comes into the float bowl these rise up. Connected to them is a needle, and as this is lifted into position it cuts the flow of fuel into the float bowl.

If the floats are not moving, the heights set incorrectly or one in punctured then they will not close the needle valve so petrol will poor into the carb and out of the overflow and / or down into the engine. A small piece of dirt in the needle valve will have the same effect.

All the best

Keith
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[swingermike]

cheers keith

I've been and collected the bike. At first it wouldn't start and petrol poured out so i gave up and rang the breakdown company but tried again 5 minutes later and it started so i shot home and cancelled the call out. No petrol poured out at all, is this because with the engine running it is using up the petrol as it comes into the float bowl.

cheers Mike

[Kickstart]

Hi

That will be some of it. Also possible that the flow of petrol dislogded the grit that was stuck in the needle valve, or that the vibration of the engine unstuck the floats.

All the best

keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[simon1221]

Before i fixed mine it was doing 60 miles on 8 litres

I just had to adjust the fuel level, but lost about 1 litre of fuel pouring out without me noticing the other day

Whip the plug out and scrub the carbon deposits off the top with a wire brush, as it would have been running rich.

Another important thing is that petrol should have only been coming out of the black overflow pipe, just in front of the right footpeg, it should only really come out of the two orange coloured pipes out of the top if you turn it upside down.

Might be best to invest in an inline fuel filter to have less chance of it happening again, only costs about £1 if you look in the right place and dont get a fancy ass chrome one.
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