Just got my Carbtune... 2nd gas tank question

[GooberPea]

OK.. first off, I have a carbtune folks can use in the Superior, WI or Duluth, MN area.

Secondly, when I look in many threads regarding syncing or otherwise adjusting the carbs, people hook up some sort of secondary fuel tank using an old gas can or something similar. Why?

Is there some reason you can't just get some extra long fuel line and use the tank you just took off the bike? I assume if this was possible you'd have to set it to "prime."

Also, I just want to double-check... When syncing the carbs your are supposed to plug the vacuum hose coming up from the carbs correct?

Thanks all for your help once again,
Craig

[salty_monk]

That works fine. Make sure you clamp the vacuum hose off (leaving it connected to the carbs) so it's sealed.

Get a straight through joining piece & then you don't have to disconnect your existing fuel pipe from the carbs (a real pain on CV's if they are not off the bike!)

Dan

[paco13]

I just flip the tank backwards and set it on the frame with the tunnel over the rear fender well and strap a bungee over it. I use longer fuel line with an in-line filter to connect to line @ carbs and a longer vac line to #2 carb(1100E doesn't have prime setting).

[Macmatic]

I'm running my GS this way tonight as I work with my carbtune. You can make/buy an auxiliary tank and its less risk of having your tank fall to the floor but if you're careful you can use your existing tank.

I run a long vac line and a piece of tygon fuel line that fits over the fuel hose and the tank nipple, then I just run it in the On position.

/\/\ac

I think an Outdoor Power shop might have a tank you can hang.

[Killer2600]

Auxillary tanks are for the wrenchers that like to spend the money or equate spending money to doing a good job.

If you make it SOMEONE will buy it :-D

[GooberPea]

Great. Thanks everyone. That's what I needed to hear. I just hope it quits raining long enough this weekend for me to get the job done.

[GooberPea]

Wait! One more question... what size is the vacuum line? Maybe I'll pick some up after work and not worry about clamping it off and running on prime.

[chuckycheese]

Auxiliary tank

An auxiliary tank is, by far, the best way to go. I bought a new one on ebay and it even came with a petcock. It was much cheaper than the Motion Pro tanks and looks to be the same thing.

[Macmatic]

I'm pretty sure you want 3/16 hose for the vacuum line.

Use fuel line, not vacuum line. When I used vac line the heat caused it to stiffen up, this didn't cause running problems but once I took it off the tank it never really sealed well and I ended up replacing it.

/\/\ac