octy question

[oldyam80sg]

My SG starts up fine somewhat-even though i have to give it some throttle when the choke is out to help it out.Once it is warmed up it idles fine.Today i went for a ride and it seemed fine but when i switch the petcock to on it seems that maybe there is too much fuel going into the carbs.Bike started to run rough until i gave it more throttle.Then it starts to pop when i let go of the throttle.I made it home and pulled the plugs- slight very light color to the plugs,and not wet.Started the bike again and it was fine.If the octopus was leaking, would this cause the fuel to some what build in the carbs until it fired maybe too much fuel if thats possible?

[TopCatGr58]

Hey Yam,

Can't remember if you still have the OCTY? The carbs will STOP any excess fuel from getting in via the float valves, so the amount of fuel flow from the petcocks being excessive is nothing to worry about. Sounds more like fuel starvation to me! If you still have the OCTY, run it on PRIME and see how it behaves. IF okay, then possible problems with OCTY supplying enough fuel. Popping on Decel with throttle closed can indicate lean, but is somewhat common.
T.C.

[oldyam80sg]

Thanks TopCat- Yes i still have the octy.I'm getting another one from Andreas Weiss but until then i will try it on prime.My Pingel petcocks say only on,reserve or off.I will try reserve and see what happens.

[TopCatGr58]

Well, if you have the Octy, but have the Pingle spigots, then you have some modified plumbing!? The Pingle probably have only 1 spout per petcock. The OEM had 2, the back one was where the fuel flowed when using ON and Reserve, and went to the Octy where it was controlled by it's vacuum valve.

The Front/forward spout on the OEM was the outlet for the PRIME, and it bypassed the OCTY going directly to a "T" fitting that was after the outlet side for the Octy and went directly to the CARB allowing the fuel flow from the PRIME side to go straight to the carbs. I'm thinking that you have the Pingles plumbed to the OCTY and that you don't have the extra lines that were "T"'d into the lines coming from the Octy to the carbs.

So...what you can do is connect the lines directly to the carbs and bypass the Octy to do the starvation test run!?
T.C.

[oldyam80sg]

octy question

I'm looking at doing away with the octy as i strongly believe it is leaking.Is there any test to positively determine this other than fuel continues to flow after petcocks are turned off?Also where do you get the y and t fittings?Also do you need to run fuel filters.I don't know if my auto parts stores have something like that?

[The Lorax]

if fuel flows after the petcocks are turned off, it sounds to me as though the petcocks are the issue. when they are off, no fuel should flow. if the octy is the issue, fuel will flow when the petcocks are on, running or not. the octy, is a vacuum valve that allows fuel to flow only when there is a vacuum is applied. If I'm telling you a bunch of stuff you already know, please forgive. if you want to remove the octy, plug the forward holes on both petcocks, run the rear holes to the carbs inlets. pretty easy as mods go, just make sure the octy is the problem. have a nice day and ride safe

[oldyam80sg]

The stock petcocks-are the plastic tubes that go onto the petcock still available? I'm missing those.Can new petcocks be purchased? The Lorax i will check that out-Thank You!

[TopCatGr58]

Hey Yam,

BikeBandit shows the whole assembly, but it's grayed out, and not accessible, you can't put a # into the spot where you would place HOW MANY you want to order!

The Filter towers are available, and you can rebuild the OEM petcocks.

I'm more interested in a photo or description on how you have the Pingels plumbed to the OCTY. You can get the "Y" and "T" fittings from local auto store, 1/4" OD, usually plastic VACUUM hose fittings, but will hold up and work with fuel just fine. It's just rubber vacuum hoses that you don't want to try to use as fuel lines!!

Just pull the hose off of the petcocks, and turn to OFF and see if fuel leaks from them. Pingels are supposed to be quite good, so hopefully they won't leak. You can easily bypass the Octy by just running the lines from your pingels to inline filters and then to one pair of carbs inlets!
T.C.

[cajun31]

If you do still have your original petcocks it thought you might like to see this listing. Note: The Square piece is what goes in the Octy to rebuild it.

http://cgi.ebay.com/ebaymotors/Parts...m200232265295&

[GNEPIG]

I would keep the Pingles (if they don't leak) and lose the octy. Those things are so weird that replacement parts don't even fit them anymore.
You can get replacement parts for the Pingles almost anywhere.
Just remember to turn them off when your finished riding.

[Axel]

TESTING

OK . I may be wrong but if petcocks are an issue fuel will flow when they are turned ON with the motor not running ( no vac) .
If they are working fuel will not flow even if they are set to ON with the engine not running . Only time you have fuel is when you set them to PRI (prime) with the engine not running .
Fuel will flow when petcocks are on ,engine is running and OCTY is delivering VAC to the petcock.
If the OCTY is not working and your petcocks are good fuel cannot flow when the engine is running with them set to ON ,or at least some starvation .
Set the petcocks to PRI to test some of these conditions.
For OCTY concerns and VAC leak concerns I did this:
I disconnected the OCTY vac line from the carb boot and plugged the port ( I plugged the vac line too as a safety) . NOW with my petcocks on PRI ,my bike runs and I have eliminated the OCTY .

Sound right ?

[Ken Talbot]

Re: TESTING

Originally posted by Axel
Fuel will flow when petcocks are on ,engine is running and OCTY is delivering VAC to the petcock.Sound right ?

Not quite. The octopus does not deliver vacuum to anywhere. Inside the octopus is a vacuum controlled diaphragm. It receives fuel only from the one nipple on each petcock that flows in the on or reserve position. It passes that fuel on to the carbs only when engine vacuum pulls the diaphragm over. Without vacuum, the spring behind the diaphragm keeps it pushed over the other way to prevent fuel flowing.

The other nipple on each of the petcocks flows fuel only when the petcock is set on prime. This fuel does not go to the octopus. It goes to a T fitting just above the T between each pair of carbs. This allows fuel to be supplied to the carbs with no involvement of the octopus.

[Axel]

OMG

WOW . so its normal that both my ports pour gas when I turn the handle to indicate them ? And only the OCTY controls the fuel flow ?

[Axel]

Just in case

Just in case that didnt make sense.

So no vacuum to my petcocks - right ?

Octy allows fuel by vacuum when engine running - right?

Octy stops fuel when not running when vacuum is released - right ?

Prime bypasses all that and sends fuel directly throught the tee .

This is starting to make more sense to me . By George I think its working correctly!!!

I dont know why I didnt see that before . Thanks God for XS11.com.
Thanks Ken

[nubee]

oldyam80sg,
Ditch the octy!
I don't if K&L is still the only company making a diaphragm or not, but they made the pin that stops fuel flow too short. This makes the octy useless.
Here is my solution on an old post. I can take fuel from either side of the tank or both sides. The Pingel petcocks don't have any rubber in them. Spent way too much on it all but it works great!