New guy from Ohio - '82 GS750T

[Guest]

Hey there my name is Bob, not completely new to searching around the forum but new to actually making an account, figured I should post something finally instead of just lurking. I'm only 22 and fairly new to working on bikes but eager to learn. This isn't my first bike but I used to be more so the type to pay someone else to do my mechanical work being too nervous to do it myself and make an issue worse. Picked up my 1982 GS750T last summer in Cleveland and brought it back to Youngstown. Rode it all summer long even though she was ugly as could be (paint very faded and clear coat destroyed by years of spilling gas and sun beating on it) and had a bit of a valve cover leak. Nothing major, so I figured I'd enjoy it for the few short months of really good riding weather we get here and put off the tearing it all down until winter. When I finally got to working on it discovered my head gasket was leaking too, so I broke out the Clymer's manual and started learning my way around with the help of a friend. so I got everything all changed and dialed in as far as the timing goes but I eliminated the factory air box and put pods on each carb and now need to re-jet the carbs because of too much airflow. If anyone has any info regarding that type of issue I'd love to hear your opinion! anyways, here's a few before and after pictures. Still haven't got my side covers or emblems back on and have a few more cosmetic things to do. I'll post the before picture in another comment. Can anyone explain to me as well how to post multiple photos at once? IMG_7667.jpg

[sailor_bob]

This was the day I picked it up.

[loud et]

Well if you are going to run the pods you are going to want to get the dynojet stage 1 kit. Stage 3 is for if you are running pods AND an aftermarket 4-1 exhaust.
If will save you lots of time trying to order jets and tuning all summer long instead of riding.
Also get the kit asap or you are going to burn your headers.
They will turn yellow/ dark colored, if they haven't already because the bike will run lean (not getting enough fuel) with the stock jets.
No, you cannot just adjust the 4 mixture screws and get it rich enough to run properly.
Get on Bass cliffs site, there are Suzuki manuals there for free download. Forget clymers.
In the carb, fuel , exhaust section the top 4 threads that are marked sticky have all the info you need to tune a bike with pods.
Do some good reading and get it running good.

[sailor_bob]

Thanks man, I appreciate it. I'll have to find those threads and check it out 👍🏻

[storm 64]

Well, I told Sailor Bob to not go the Dyno jet route and to just up the Mikuni main jet two sizes and he'll be in the ball park. He's a bright young man and I'm sure he'll do the research. Also if he has any questions or needs anything he's only three houses down from me! It's been awhile since I tuned a motorcycle for individual type air cleaners, but it's not rocket science...

[loud et]

Well, I told Sailor Bob to not go the Dyno jet route and to just up the Mikuni main jet two sizes and he'll be in the ball park. He's a bright young man and I'm sure he'll do the research. Also if he has any questions or needs anything he's only three houses down from me! It's been awhile since I tuned a motorcycle for individual type air cleaners, but it's not rocket science...

I was wondering if this was the guy you mentioned that you met. Cool. My 850 is soo close to being done. I still have my other 2 running. If you guys wanna meet up sometime, let me know.

[steve murdoch]

Welcome to the site, Bob.
Having a knowledgeable GSer like Storm nearby is a bonus.

[sailor_bob]

I appreciate your help! I'll hopefully be stopping at Golan's after work Monday to see if they have the jets I need. I'll throw them in real quick and see where I'm at with it. Might even just buy a couple sizes at once and play around with it. I'll let you know how it comes out.

[sailor_bob]

Will do man!

[sailor_bob]

Yep definitely. I was not really surprised completely that it ran different with the pods but in a way I was because this is my second GS. The first one was also and '82 but a GS650g, shaft driven model. I sold it to a buddy a few blocks over and he still has it to this day. He also eliminated the airbox and went with some pods, and he never had to change anything. He threw them on and the bike didn't change a single bit. Still purred like a kitten and ran just as good if not better than with the factory box. Any thoughts on that? Just pure luck maybe lol.

[tkent02]

No, if the pods were any good they flow more air, if it flows more air through the engine it needs bigger jets to flow more fuel. Could be it had too big jets in it already, but stock jetting cannot run right with pods, especially on a bike with CV carburetors.

[storm 64]

Also Bob your filters will need oiled. Stop on over, I have a big can of K&N filter oil.

[Chuck78]

Might want to get some ebay rebuild kits than contain jet needles that have adjustable clip notches. Or get the radio shack washer pack assortment that is very popular for shimming slide needles on motorcycle carbs that do not have adjustable needles. Shim it up slightly, a little less than 1mm. Try that.

adjust the mixture screws for idle, needle will adjust 1/4 to 3/4 throttle, 2 or 3 sizes large main jets will affect 1/2 to full throttle. Norm's been doing this for a while, you're in good hands!

Come down to the Cambridge/Zanesville area or south of there sometime with Norm and Adam and ride some really fun twisty roads in the hills down this way with us. I've got tons of really great routes plotted out all over southeast Ohio and around zanesville/coshocton/etc.

Ask Norm about how the roads compare that I took him and David Drey6 on this past September on Labor Day. We rode 8 hours or so all on super fun very twisty roads in the hills...
-Chuck in Columbus

[sailor_bob]

Okay thanks! And I actually did shim them up 20 thousandths. Helped a little but I went back down to one size above factory on the main jet. Need to go up one more I think and think might need to go up a size on my pilot jet as well. My dead spot is right 1/4 and 1/2 throttle somewhere. Pulled a couple plugs and it was still running super lean. Need to go back to a bigger jet for sure.

[Chuck78]

1/4 to 1/2 throttle is all in the needle jet i.d. and jet needle taper/height-clip position

Needle jets are not readily available so the best you can easily do is adjust the needle height a little higher (more shims) and richen the pilot circuit slightly.

Needle jet i.d. and jet needle diameter at the thick part and the start of the taper are what you use to adjust that. A set of slides with a lower cutaway would also work, but slides and needle jets are not common tuning parts these days for these vintage carbs, so go at it with the needle height. Then adjust your mains to WOT pulls at high rpm, waiting enough time to ensure the diaphragm has risen up all the way (a very steep straight long uphill desolate stretch is really needed especially on CV's - you need to set the main size for good plug chop coloration and great power at near max rpm under load. Best to be slightly rich than to melt a piston.