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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-28-2012, 03:54 PM   #1 (permalink)
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Fuel filled airbox! Need direction.

Today I walked up to my '01 Bonnie to find a rainbow river flowing downslope from the bike.

I removed the left-side cover and found that the airbox was filled with fuel and that it was dripping down onto the swingarm and then then the fuel would travel back along the swingarm and drip off onto the ground from the very end.

Conditions:
1. My petcock was turned to "on". I know, this is a bad habit. I usually remember to turn it to "off" but this time I didn't. Still, if everything is working correctly, it shouldn't get leak.

2. My choke/enrichener was about 1/4 to 1/2 the way out. Could this have caused the problem?

What I also found was that the little oil catchment tube under the airbox was filled with fuel. I pulled it out to drain the fuel from the airbox and stood the bike upright to get it all out. The leak was relatively slow, only about a drip a second off the end of the swing arm.

I was able to start the bike (it reluctantly came to life) and ride it home 3 miles where it now sits.

This seems like a float problem to me and I'm planning on pulling the carbs and measuring and adjusting my float levels asap. Is there any way to at least measure them when they are on the bike? I hate dealing with the throttle cable connections.

Anyways, I've attached pictures. Let me know if there is anything else I should look at. I looked at the fuel hose from the petcock and didn't notice any problems.
Attached Thumbnails
Fuel filled airbox! Need direction.-imag2386.jpg   Fuel filled airbox! Need direction.-imag2387.jpg   Fuel filled airbox! Need direction.-imag2388.jpg  

Last edited by luckyduck; 11-28-2012 at 03:57 PM.
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Old 11-28-2012, 04:25 PM   #2 (permalink)
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Was your bike parked with the rear downhill? Or how? I ask because if fuel made it into your cylinders, it could have (and probably did) drained down into the oil. If that happened, I wouldn't drive it again until you drain and replace the oil. Worst case scenario: you could spin a bearing=a lot of repair money. And yes, sounds like a stuck float to me.
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Old 11-28-2012, 04:50 PM   #3 (permalink)
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don't know about modern synthetic oils but in the old days with dino oil...
we would take a match to the dipstick, if it flamed right up you had gas in the oil. the oil would not feel slippery, it would feel more like a solvent. i remember seeing cams with no lobes after an engine being "gas washed"
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Old 11-28-2012, 05:52 PM   #4 (permalink)
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Probably a float needle is not properly seated or is stuck open - maybe gummed up.
I would check this before messing with the float height.
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Old 11-28-2012, 07:24 PM   #5 (permalink)
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Thanks for all the replies. I guess I should do a oil change very soon regardless.

It was parked with the rear slightly downhill.

I'm going to rap on the carbs a bit with a plastic handled screwdriver and see if that loosens up a float.
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Old 11-29-2012, 02:05 AM   #6 (permalink)
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Fixed, or fixed so far. I think my vent tube from the carbs (from removing Cali evap system) was getting pinched by the sidestand causing the bowls to overflow. I rerouted the vent, tapped the float bowls and I don't have any leaks so far. What should I do about my filter element? It's a uni filter. Clean and re-oil?
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