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78 1000 carb specs

  • Thread starter Thread starter shwaz
  • Start date Start date
Ordered 4 replacement fuel screws from Z1 but they're on back order so it will be a few more weeks before they got to me
Meanwhile I'm going to start putting them back together, will spray them again and do my best to compare the fuel screw holes between the two sets of carbs I have. Not sure what looking at them will reveal unless there's something really obvious .

Haven't done float height so that has to happen too.

Thanks both for the insights. Still not completely sure if I'll leave in the 17.5. Vet seemed to say I need 15 to get the fuel screws set right. Wouldn't pods also increase airflow to the pilot system requiring a larger pilot jet?
 
I'm no expert with carburetors. The experience I had was that I sent my Carburetors to Wired George to rebuild and jet for pods and 4-1 pipes. I was initially impressed with the 52 mpg I was getting after I got the carbs back after a full riding season of waiting and $408.00 until one 30 degree night in a traffic jam of stop and go traffic going up the mountain my, unknown to me, super lean carbs toasted my motor, it was smoking. It cooked off one and a half quarts of oil in the process. Needless to say I was totally clueless as to how the bike should have run. I changed the motor for a low mileage motor on my parts bike, and member KEITH KRAUSE came to the rescue walking me through rebuilding my carbs properly with a stage three jet kit and the proper O-rings. Another member sent me the #15 pilot jets recommended for this jetting setup because my carbs came back with #20 pilot jets, #117 main jets with needles in the third notch. Throughout the entire process with many members chiming in, I never once heard anyone suggest larger pilot jets for the VM carbs, and I have followed many similar threads since without mention. It was also recommended that I use the Dynojet stage three jet kit because I was told very few had satisfactory results using Mikuni needles. Something about the Mikuni needle shape not transitioning properly, where the DJ needle was designed to overcome this. I have my carbs working very well and have rebuilt several sets since with success, so I now know a good bit more about them than I did when I started, but I have never tried to jet for pipes and pods with the Mikuni needles, so you will have to draw your own conclusions. The Dynojet main jets shipped were 138 (Mikuni 129.4) and 142 (Mikuni 133.1) I used the 138's
 
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thanks vet
that's good info - i appreciate it! will definitely keep those numbers handy. think i'm a ways off from trying to get the bike running - certainly from having it legal and/or trip worthy :)

i did get my new fuel screws today unexpectedly, didn't think they'd show up for another week or more. props again to Z1. man are they pointy! even the old ones I thought were pointy don't compare.

one more spray and rub to get the greenish-white patina off all the small pieces and it'll be time to start putting the carbs back together.
 
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