Engine Stops While on Idling Rev

[schwalbewurger]

Part of the exhaust

 

[schwalbewurger]

Full picture of the bike (still have some saran wrap on it while prepping for fiberglass work to create new seat...). This was about 3 weeks ago.

 

[Rich82GS750TZ]

Part of the exhaust
View attachment 61282

Well this ought to be good. Please tell me that the PO (previous owner) didn’t tell you that those are exhaust pipes.

Those are engine case guards. Have nothing to do with exhaust. I’m really afraid of where this is leading.

 

[allojohn]

Well this aught to be good. Please tell me that the PO (previous owner) didn’t tell you that those are exhaust pipes.

Those are engine case guards. Have nothing to do with exhaust. I’m really afraid of where this is leading.

Oh boy......

 

[Big T]

Part of the exhaust
View attachment 61282

You are kidding, right?

Time to stop trying to be a "builder" and start trying to be a mechanic

 

[roeme]

You are kidding, right?

Time to stop trying to be a "builder" and start trying to be a mechanic

Take it easy, obviously they're new to this and those bikes, and can't identify parts yet. They don't seem ignorant and willing to learn.

We shall see where this goes.

(P.S. I do admit to snickering a bit when I saw the "exhaust parts")

 

[Steve]

My condolences on the "pods".

Partly because you are about to head on a frustrating journey in the world of jetting, but also because those are the cheap $25 Chinese specials that are rather hard to tune the carbs for.

Sorry to be rather blunt about it, but I'm actually serious about it. The jetting required depends on air flow. Unfortunately, the air flow available with those pods will change with the daily humidity. The paper will absorb some of the moisture in the air, and the slightly-moist filter will partially restrict air flow. If you really want the "look" of pods for your "cafe racer" project, good pods will cost considerably more. K&N pods are well over $100. APE pods are just as good, virtually identical to K&N, but cost considerably less. Your best bet would be a stock airbox, but that might not fit with the "look" you want.

.

 

[schwalbewurger]

Hello everyone,

My bad - I didn't know that those were the engine case guards. Thank you for teaching us more info! We are about to buy parts and tools needed to rebuild and clean the carbs - will post pictures of it. Will take no shortcuts to it.

 

[schwalbewurger]

So I've searched through the forums through the advanced search, and then using the "search titles only" function for GS750 pods tuning/GS750 pods adjustment. Please correct me for my mistakes, but here is what I've gathered:

-Jet needle (not needle jet) needs to be adjusted at least one notch up.
-Main jet: 117.5 (bought and arrived just now)
-Pilot Jet: Stock (15) (bought and arrived just now)
-Fuel screw: at least 7/8 out (because 7/8 out is stock airbox) - how many turns out should it be for our situation?
-Air screw: At least more than 1 1/4 turn back (since stock airbox is 1 1/4 turn) - how many turns according to y'all's experience does the air screw need to be for K&N pod filters with 117.5 main jet and 15 pilot jet? I found on the forum search that people are getting at about 1.5 turns out.

Also to recap, we are planning to use either K&N pods or APE pods (though I cannot find APE pods for 1978 GS750, they only have pods for 1980+ GS750) and stock exhaust pipes. Elevation is about 2300 feet here at Lookout Mountain. And I'm sorry for the noob question, but the pilot jet and the main jet just needs to be screwed tightly right?

We have been able to clean up the carbs and rebuild it, so now we just need to put the appropriate main and pilot jets and tune it up. Turns out when we cleaned the carbs, on carb #1, the pilot jet was broken - the top piece was stuck on the carb body, but we were able to pull it out and replace it with a new one (15).

Thank you very much

 

[schwalbewurger]

Pilot jet from carb #1

 

[schwalbewurger]

Carb cleaning

 

[Big T]

A good start
Did you get an O ring kit?

 

[schwalbewurger]

A good start
Did you get an O ring kit?

Yes, but not from the cycleorings site. So how many turns would you recommend us to tune for the air screw and the fuel screw for pod filters with stock exhaust at ~2300 feet? Should we start with 7/8 out for fuel screw and 1 1/2 out for air screw?

Thanks!

 

[salty_monk]

Ape don't do a smaller size Pod so you're out of luck there... There are some other K&N copies around, I think someone here posted a cafe racer type supply place in the Bay area that had some.

The easiest way to jet a bike for PODS is to use a Dynojet kit. You may find it quite difficult without that.

A good resource for our bikes is https://www.z1enterprises.com/

 

[Big T]

Yes, but not from the cycleorings site. So how many turns would you recommend us to tune for the air screw and the fuel screw for pod filters with stock exhaust at ~2300 feet? Should we start with 7/8 out for fuel screw and 1 1/2 out for air screw?

Thanks!

That would be a good setting to start with for the pilots
Remember, they only control idle and off idle mixture