Petcocks

Just wondering if I remove both vacum petcocks off of my new to me xj1100 a install two new manual petcocks, will this lead to under fueling issues at higher rpm's? Both petcocks need to be rebuilt and I'd like to get rid of all the unnecessary fuel lines. Thanks

 

do you have the full octopus set up on the bike?
there are a few threads on this very few.
if i remember correctly poster did 2 petcocks with 1 fuel line from each petcock to carb rack, with no interconnect tube between petcocks

 

also there are 2 web sites that deal with the 1100 one is UK based. welcome

http://www.xs11.com/

 

Perfect thank you. Yes it has the octopus setup. Would much rather prefer two manual petcocks with two separate fuel lines then the current setup.

 

fp17) Aftermarket complete MANUAL ON-OFF-RESERVE FUEL VALVE KITS. Not really a "petcock" in the XJ sense of the word. Yamaha designed their petcocks to be a very clever "automatic" fuel supply valve, meaning it has to have engine vacuum for it to function. Great idea (when it works) because it allows us to basically "set it and forget it". Bad news is that when the seals go bad, or as age wears the internal components, it can become a really bad idea, since it will leak fuel into the carbs when it's not supposed to, leading to flooded carbs, fuel in the crankcase, spun bearings, etc.

These MANUAL FUEL VALVES are either ON (in either the standard "ON" or the "RES"erve positions) or OFF. It doesn't depend on engine vacuum, just gravity. So it won't ever leak or pass fuel in the OFF position. That's the good news.....

The bad news is that you have to remember to turn it on or off manually (as in every time you start your bike up or shut it down) or, instead of blaming a faulty petcock for your resultant problems, you'll have to blame yourself!

Once installed, these units will fit and look similar to an original XJ-series petcock. You will need to remove your petcock vacuum line from the #2 or #3 intake manifold boot nipple and replace it with a rubber block-off cap plug. These fuel valves use the same size fuel line as original.


XJ550, XJ650 (except Turbo), 1981-83 XJ750, XJ1100, and all 1979-81 XS1100 Special models:

HCP20971 OEM ON-OFF FUEL VALVE KIT, contains a brand-new replacement fuel valve which will fit all XJ650RJ Seca and XJ1100 models. Includes the fuel valve, attaching hardware, filters, and an intake manifold vac port cap and clamp (to block off the now-unused intake manifold port). Does NOT require fuel tank opening enlargement! NOTE: requires two units for use on XJ1100 and XS1100 Special and Midnight Special models, and the fuel outlet port will be pointing "forward" when installed on the right side fuel tank outlet. Each:
$