Vac­uum taps

Classic Motorcycle Mechanics - - WORKSHOP CMM -

Au­to­matic fuel taps ar­rived early on for Suzuki and the com­pany made sub­stan­tial mar­ket­ing capitol about their fit­ment. More of a con­sumer con­ve­nience than gen­uine im­prove­ment, the tap re­mains in the ON po­si­tion but blocks the fuel flow un­til the en­gine’s vac­uum pulls a spring loaded di­aphragm away from the out­let pipe. The re­quired vac­uum is fairly min­i­mal and eas­ily cre­ated even by kick-start­ing an en­gine. Th­ese taps tend to work fine un­til wear, fuel or old age takes out the seals and di­aphragms. Re­pair kits are avail­able for some vac taps but not oth­ers. If you are go­ing to at­tempt a re­pair on one of th­ese units pop some reg­is­ter marks on the seal­ing back plate and the tap body to en­sure ev­ery­thing goes back to­gether in the cor­rect po­si­tion. Also note and pho­to­graph the ori­en­ta­tion of the di­aphragm, the spring and seals. Fi­nally note that the back of the di­aphragm is ac­tu­ally vented to at­mos­phere via a tiny chan­nel in the cast­ing. With­out this the tap would flow for a pe­riod af­ter the en­gine was turned off rather than cut­ting out im­me­di­ately.

Newspapers in English

Newspapers from UK

© PressReader. All rights reserved.