Petcock Time!
98valk:
Quote from: John U. on May 04, 2009, 07:04:07 PM
Quote from: CA ExhaustCoatings on May 01, 2009, 08:18:10 PM
If re-doing the oem unit, install a 1/8" npt snubber in the vacuum line to the petcock. The diaphragm will then take a very long time to wear out.
Could you help us dummies understand what a snubber is. I'm thinking it's a vacume reduction device like a small orfice jet but I'd like to hear more about it. Thanks in advance
it doesn't reduce vacuum it reduces pulsations. one type is of the orifice type, however I used the type that has perforated disc of .5 microns, which is for extreme pulsations. Using a mity-vac it would take aprrox 3 seconds for the vacuum to bleed down thereby allowing the petcock to close. The bike has not been running right for the past 4k, (20k on bike now) miles, I kept thinking it was all the carb and airbox mods and ethanol gas was causing the problems while I was trying to dial in the carbs. Here all along it was the vacuum diaphram that was leaking causing intermitent lean conditions. Using my background in LP air systems I remembered about snubbers and how they are used to protect gages from pulsations in the line. Mcmaster carr has a 1/8" snubber $8 and brass fittings, total $$ was $14. Bike now runs like it use to with the rebuilt petcock.
John U.:
Many thanks CA ExhaustCoatings for the info and source. This is the first new (to me) idea I have heard that might help mitigate petcock troubles, and their terrible consequences. Do you think there is any need for the stainless snubber? I guess I can find the hose barbs to hook it up locally.
So where in South Jersey are you? I'm in Lower Delaware. Let me know if you're heading my way.
John
98valk:
Quote from: John U. on May 05, 2009, 07:09:04 AM
Many thanks CA ExhaustCoatings for the info and source. This is the first new (to me) idea I have heard that might help mitigate petcock troubles, and their terrible consequences. Do you think there is any need for the stainless snubber? I guess I can find the hose barbs to hook it up locally.
So where in South Jersey are you? I'm in Lower Delaware. Let me know if you're heading my way.
John
Brass is fine, that is what I used. Install it with the disc towards the intake manifold. I installed it 3-4" from the manifold connection just under the carbs. I secured it to the carb support bracket.
http://www.chemiquipproducts.com/ download the catolog.
Finding a female 1/8" hose barb is the hard part to find. mc'master has both. http://www.mcmaster.com/#44555k123/=1qq4na $2.51
http://www.mcmaster.com/#44555k128/=1qq4y9 $8.69 snubber .5 micron disc http://www.mcmaster.com/#4034k11/=1qq5ag $1.00
I'm east of phila.
Ricky-D:
You ought to go ahead and do a de-smog while your at it. Get rid of all that extraneous vacuum stuff sitting on top of the motor. if you were to combine a Pingel petcock with a de-smog there would no longer be any vacuum lines to any carburetor, and finally, relieve you of all the related worries and aggravation that would occur in the future.
Bladedog:
De-smog is definitely on my list of things I want to do (partly because I know it's an improvement, and partly because it's almost free!) but I am putting it off uuntil I can get some direct help from another well-informed Valker, maybe someone in SoCal.
Petcock rebuild went smooth- no more dribbling gas while the hoses are off!
Thanks folks!
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