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Author Topic: best way to lap float valve needle?  (Read 1323 times)

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Offline slowjo

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best way to lap float valve needle?
« on: June 14, 2011, 05:49:24 pm »
Whats the best way to lap float valve needles? I skipped this step when I cleaned my carbs so off they go.
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Offline WarwickE36

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Re: best way to lap float valve needle?
« Reply #1 on: June 14, 2011, 05:56:49 pm »
A machinist friend of mine told me toothpaste works... also valve grinding compound should work.
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Offline slowjo

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Re: best way to lap float valve needle?
« Reply #2 on: June 14, 2011, 06:03:42 pm »
On my CB750 K1 do I remove the valve seat, then lap.? Or do I lap the seat while its still in the carb? What tool should I use for this?
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Offline bwaller

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Re: best way to lap float valve needle?
« Reply #3 on: June 14, 2011, 06:05:54 pm »
A Q-tip works.
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Offline Spanner 1

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Re: best way to lap float valve needle?
« Reply #4 on: June 14, 2011, 07:11:59 pm »
You can take out the valve seat so as not to get any grinding compound ( toothpaste ) in the carb body..... what to lap it with ??..... why the valve , of course !!! The object is to 'match' the valve tip to the valve seat for no leak seal, so put the valve in the end af a short piece of plastic tube ( spring end ) sized for a snug fit, put the other end in your cordless drill and run it forward and reverse with the t. paste in the seat.... ;)
This method only works for metal tipped ( earlier ) float valves  :)
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