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Old 05-07-2013, 02:47 PM   #1
2Gordons OP
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Old Carb Question

Hey All:

Time to work on the old beater bike that my bride rides occasionally. I went to start it up, and upon turning on the tank petcock, gas started running out the drain-tube on one of the carbs. I assume that's not right.

The bike is a Honda CM400T (twin) circa 1980 vintage. Gas appears to be running straight through the left carb, like a spigot. I'm wondering if it's a stuck float? Any tips what else to look for before I dive in? No gas leaking out the petcock, or fuel-line to the carbs.

Any good sources for rebuild kits for these old pumpers if that's what it comes to? This one doesn't go to the shop much... I usually try to muddle through on the old girl (the bike). Thanks for any input.

2G
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Old 05-07-2013, 02:54 PM   #2
emti
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It sounds like the float is stuck and or the needle is not seating tight. Try tapping on the float bowl, when that dosnt work you will need to remove the float bowl and see what is in there that is not clean fuel. emti
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Old 05-08-2013, 02:41 PM   #3
groop
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I agree that it sounds like a stuck float. As far as ordering supplies, I would guess just about everyone would carry rebuild kits as Honda used the same carbs on many models for many years. Is it a Keihen?

Anyhow, here's the BB page
http://www.bikebandit.com/houseofmotorcycles/1980-honda-cm400t/o/m2129#sch39743
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Old 05-08-2013, 03:27 PM   #4
emti
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Or try motorcyclecarbs.com emti
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Old 05-08-2013, 09:39 PM   #5
qkenf4u
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Cool2

pull it/them off and soak them in carb cleaner/pine-sol (check out the thread on here) , get them clean and rebuild them with the kits on ebay

http://www.ebay.com/sch/i.html?_trks...at=0&_from=R40
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Old 05-08-2013, 09:43 PM   #6
8lives
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But I always tap first,2nd blow through the fuel line,and if that doesn't get ya results then take it apart,banging with a wrench and a blow job will often loosen things up and stop the free flow.
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Old 05-10-2013, 12:39 PM   #7
2Gordons OP
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Thanks for the tips.

Got it stripped down most of the way- 1 stuck bolt I can't get to. Need to buy a particular wrench, then I'll try and get them off this weekend. There's always one fastener on an old bike that won't budge...
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