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80 GS750 lives- now the hard part

  • Thread starter Thread starter Texatl
  • Start date Start date
You need to rejet the carbs if you are going to use the pods. Would be far easier to put the stock airbox back on.
 
Stock air box was MIA. But I have to believe the bike will run with stock jetting and pods. Sure it'll eventually need a rejet, but for it not to take any throttle just because it has pods sounds- extreme.

But- I'll go get some jets and move the needle and see what happens.
 
Texatl said:
Stock air box was MIA. But I have to believe the bike will run with stock jetting and pods. Sure it'll eventually need a rejet, but for it not to take any throttle just because it has pods sounds- extreme.

But- I'll go get some jets and move the needle and see what happens.
Click to expand...
Yo man, if you have some free time in the next few days, give me a shout. I would be more than happy to come down and lend a hand. I have been taught a bit on the CVs the last couple days from Steve, and might be able to help solve the issue :)

TCK
 
That would be very cool TCK. We'll have to work something out :-)

I'm wondering (out loud mostly) could it be a spark issue???? I pulled the plugs, #3 was wet and black, 2 dark but not wet or black. 1 and 4 looked alright.

Its revs to 5K on the choke just fine, and like I said it'll run off choke now. So this would lead to believe its not spark. But anythings possible, right?

Seems like I'm getting spark as everytime I check I get a nice blue spark.
 
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Revelation..... Floats????? Maybe??? They all moved OK and looked fine-


BUT if the float doesn't activate the fuel inlet needle valve could this cause the same problem described (run on choke circuit, but hate the throttle)?
 
OK, so the bike is back together and I'm making some progress. Remounted the carbs b/c I thought I might have a vacuum leak. It runs a bit better now.

I can get it to respond and rev on the throttle- but I have a lot of adjustments left to go, and need to smooth it out. I know I need a sync, chop test, etc...

But here is an odd issue- When I start the bike (no choke) It idles really high, like 4K rpm. Idle adjustment is out all the way, so it should be idling low. It'll hunt a bit, but hover around 4K. Any ideas why its idling so high?
 
What you doin this weekend/monday? I'll be gone on Friday, and im trying to get a ride together for Saturday (wanna come along?) But after that and sunday and monday Im off work and have no plans, if you'd like some help with that thing.
 
Ugh, I just saw this. I'm working :-( I'll send ya a PM and maybe we can work sumpthin out.
 
I think I saw that you said you intended to re-jet the carbs. I also noticed that you thought that the presence of the pods would not cause the problems you were encountering.

In fact, it sounds like the pods are indeed the problem (screwing with the mixture and causing a very lean situation). I have 2 GS750s and a GS1100 and all three use pods. These machines are unbelievably sensitive to changes in the mixture. In fact, my 80' GS750 would not run without the cap on the air-filter box (before I installed pods and re-jetted). The fact that your machine needed "choke" indicates that you were way too lean. In addition, if you find that the machine idles ok, but 'bogs' during acceleration also indicates that your main-jet is too small for the amount of air that the pods are allowing.

You may have alleviated all of your problems by now....but I just thought you should know this for future reference.
 
dtkid said:
You may have alleviated all of your problems by now....but I just thought you should know this for future reference.
Click to expand...

In fact, I have not. It still idles high, and does respond to throttle. But, your post makes sense. I'm going to try rejetting to see if that helps.

Because, I'm a cheap bastard... I don't wanna buy the DJ jet kit. I'd love to just throw the appropriate bigger jets, and move the needle. But we'll see... I'd rather ride that sit by.
 
What type of pods are the on the carbs?? Are they K&Ns, EMGOs or UNI-Filter foam??? If you let me know I may be able to give you some information that I obtained through years of trying to make the machines run without spending hundreds of dollars on DJ-kits.

I'm a cheap bastard too (it ain't that we're cheap.....we just got no f@#*in' money!!) Somehow, 12 years of college and a Ph.D. is useless in my beloved USA (every since little Georgey took control).

Sorry for the political banter....but I'm currently trying to scrape up enough money to buy some bologna and hamburger buns so that my kids can eat!!!

Let me know if I can help: kid
 
TheCafeKid said:
Yo man, if you have some free time in the next few days, give me a shout. I would be more than happy to come down and lend a hand. I have been taught a bit on the CVs the last couple days from Steve, and might be able to help solve the issue :)

TCK
Click to expand...

Hey Guys. How about sharing your valued knowledge on CVs with the rest of us.
Cheers
Don
 
Hey:

Let me first tell you the easiest fix. Purchase some UNI-FOAM pods and you'll be much closer to the appropriate mixture (assuming the jets and needle settings are stock). The foam pods are much more restrictive and won't lean-out the mix.

The UNI-FOAMs are around $15.00 a piece (as I recall). You can buy them thru Dennis Kirk and mayhaps thru Z1-Enterprises.

If you stay with your Emgos you'll need some main jets (sizes 116-124) and have to be willing spend some time finding which works best. In addition, you need some jet-needle washers/spacers to allow you to raise the needle. When installing the Dyna-Jet kit it is necessary to drill out the slides; but I'm not sure if you'll have to or not with the EMGO pods.

The other option is to purchase an airbox (I hate the airboxes). More than likely, if you go back to original equipment (air-box) you'll also have to purchase some new air-box boots. I think they are around $13.00 each.

I would invest in some UNI-FOAMs.
 
Or spend 107 bucks on a Dynajet Kit, and pretty much have it right the first shot. On the CV carbs, its a little bit easier to play around with the jetting, simply because you can pull the needles and slides without removing the carbs from the bike to adjust your settings on those. As such you dont have to resync them every time you change them. On the VMs for my cafe project, not only do they not make a DJ kit for it, rendering me to jetting by hand, but in order to change my needle position the carbs have to come off the bike, the throttle control arm has to come out, the slides and needles have to come out, change the needles, then put it all back together and sync EVERY SINGLE TIME. Truely a PITA if you are completely having to guess on things. My time is worth more than that, so if there were a kit available, i would have bought it. Steve and I tried shimming my needles on my GS1100G. Took longer than i thought it would, simply because the washers were all varying thicknesses and finding matching ones, then grinding the excess diameter off of them took a little bit. I probably needed two washers in each, I got 1 in each. So, instead of going thru all that again, I am just going to order the DJ kit for my bike, and use Stage One for now.

And yes, you will have to drill the slides if you want the throttle response to be correct. Drilling the slides obviously opens up the hole in the slide, allowing air to be drawn OUT of the slide faster, creating the low pressure area that lifts the slide faster.
 
Agreed......the DJ kit is definitely the route to take. Just gotta come up with the bucks. Installation is simple and I have never installed one that didn't work perfectly.
 
dtkid said:
Agreed......the DJ kit is definitely the route to take. Just gotta come up with the bucks. Installation is simple and I have never installed one that didn't work perfectly.
Click to expand...
I was dead set on paying the 125 or so off the DJ site for them, but MRiddle showed me that they were available on amazon for around 108 bucks. Its not TOO much cheaper, but when you are dumping money in a bike, any little bit you can save helps...lol I have often wondered if the GS1000 kit that they sell for the 78/79 1000 with VM carbs would work on the 750 at all.
 
Well, I don't know about VM kits......but the CV kits are pretty much interchangeable. I used a DJ-kit that was supposed to be for a GS750 on my GS1100. The bike ran wonderfully. I have since purchased a DJ-kit specifically for my GS1100, but the 750 kit did work (I bought it because it was only $50.00 at a yard sale!)
 
I'm going down 2 paths right now.

1- Find a stock air box and filter box

2- Get a Jet kit.

This maybe a DUH moment here- but I took my #1 slide out to see where the needle was set. Only to find out my carbs (CV) don't have adjustable needles. Is right or am I a moron????

So I'll guess IF I'm right, then does the DJ kit comes with adjustable needles? Instruction on their site shows moving the needle to the #4 position, so I assume they'll come with them.

Can anyone confirm or give me a slap for being- just plain dumb. :D
 
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