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As some of you know, I have been here before with various problems surrounding my BT7's electrical (thank you Lucas) system. Having removed and replaced the original fuel pump and with electric.....followed by finalily having electronic ignition installed, (positive ground), the beast has been running like it just came off the showroom floor. Three weeks of Bliss! Several weeks ago, it just died and left me sit until I could arrange a 5 mile tow home by a stranger in a pick-up. (I now carry a tow strap in the trunk, just for these little inconviences). I have eliminated the electrical issues........as it will start and run about 5 to 10 seconds and then stop. It is getting plenty of fuel into the float chambers....but it seems that once they (or one of them empties), the gas does not continue to flow to the carburators. If I wait a few seconds, It will start and the process repeats itself. In an effort to play detective, I removed the top of the front float chamber to see if it was possibly stuck.....it was not, but I broke the gasket and had to get another from Moss. Now installed and secured, when I turn on the ignition, gas flows out of the overflow tube at the top of said float chamber. I keep taking it apart to check the innards and everything looks OK, but I can not solve the gas overflow problem, let alone know if once solved this will prove to be applicable to the problem at hand anyway. You all need to know that I am a very novice mechanic so use big print and little words in response if you can help. Thanks
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Fuel Problem [ I think]
- Thread starter Rick G
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Hi Rick,
I am assuming that you have the MK1 BT7 with two HD6 carbs. There really isn't much to go wrong with the float system. I think you are correct that the float valve is leaking. A simple & often overlooked problem is that the needle seat & it's gasket are not firmly screwed into the carb top. Or sometimes the gasket is just missing.
The float level should be set so that the distance between the inverted carb top & the bottom of the float arm is 7/16". A 7/16" drill bit makes a handy gage. This with the small spring & plunger in the float needle uncompressed. If you blow on the fuel inlet you should be able to detect any float valve leakage which dirt or a damaged valve could cause.
If you have the MK2 BT7 with three HS4 carbs with Delrin needles & plastic floats, the gap between carb top & float should be 1/8" to 3/16".
D
I am assuming that you have the MK1 BT7 with two HD6 carbs. There really isn't much to go wrong with the float system. I think you are correct that the float valve is leaking. A simple & often overlooked problem is that the needle seat & it's gasket are not firmly screwed into the carb top. Or sometimes the gasket is just missing.
The float level should be set so that the distance between the inverted carb top & the bottom of the float arm is 7/16". A 7/16" drill bit makes a handy gage. This with the small spring & plunger in the float needle uncompressed. If you blow on the fuel inlet you should be able to detect any float valve leakage which dirt or a damaged valve could cause.
If you have the MK2 BT7 with three HS4 carbs with Delrin needles & plastic floats, the gap between carb top & float should be 1/8" to 3/16".
D