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82 GS750T, Please Help!!

  • Thread starter Thread starter mjremington
  • Start date Start date
M

mjremington

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Ok, I'm gonna try to keep a long story short. Bought this bike last year. It had been sitting in a garage for 9 years. So last year after I bought it I rebuilt the petcock, cleaned and lined the tank, dropped the carbs off to be cleaned and rebuilt. After like 4 months of the shop not being able to figure it out I bought a different rack of carbs, put in the rebuild kit, and syched em. The bike ran great (for the whopping 2 months I was able to) though she's mighty cold blooded. Now that riding season is once again upon us. I put new tires on, new chain, sprockets, new brakes, and new exhaust gaskets. Fired her up and she was cold blooded like usual but now for the problem. Cylinders #3 and #4 are firing and warm like they should, #1 and #2 are ice cold for a very long time (several minutes) and then pick up and stay running and all is good. It did this last year but I got my bike back from the shop so late in the season and WI gets pretty cold so I assumed thats why. But obviously not. She seems to be running lean. Compression in all are good, spark is there on all 4. I'm stuck. Any ideas would be helpful. I'm just confused as to why it eventually picks up. Itd be easier if they never fired. But they do but it takes forever and I think the bike could perform better once this is fixed??????
 
Greetings and Salutations!!

Greetings and Salutations!!

Hi Mr. mjremington,

There is a proper way to clean the carbs, and it's not using aftermarket "carb kits", unfortunately. You'll also need to adjust the valves, make sure there is sufficient voltage at the coils (read up on the coil relay mod), and check the charging system (as in The Stator Papers). And that's just for starters. Below are a couple of links that will get you started down the path toward a safe, reliable, classic GS motorcycle...

Anyway, let me dump a TON if information on you and share some GS lovin'. :D

I just stopped by to welcome you to the forum in my own, special way.
big_hi.gif


If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....
hat1.gif


Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Cleanup Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. Now let me roll out the welcome mat for you...

carpet.jpg


Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike! :D

Thanks for joining us. Keep us informed.

Thank you for your indulgence,

BassCliff
 
So your thinking its more so in the electrical then in the fuel delivery or possible lack there of? The jets are OEM and all the brass and O-rings in the carbs are new. The new rack was manually cleaned then put into an ultra sonic dip. I'll read the link on the valve adjustment and stator issues and fix. Thank you for the helpful info
 
Adjust the valves for the "cold-bloodiness" and do a proper carb sync with a manometer. :)
 
Ok, Ill adjust the valves. I have a Clymers so that should help along with the info BassCliff sent me and guess we'll have to re-sync the carbs. The mechanic who did it last year and had her for 4 month assured me that all was good. The #1 and #2 cylinder not picking up for a long time was happening last year but I got it so late in the season and with them finally picking up and #3 and #4 acting normal I assumed it was normal or at least due to it being just about winter here in Northern WI. But can the carbs being out of sync cause #1 and #2 not to pick up or fire until warm? When 3 and 4 are good? And she idles at 1100 when all 4 are firing right. And can the valves needing adjustment cause this? Or will that just help the cold blooded nature? I'm in love with the bike but its one thing after another. But I'm plugging away.
 
Your suffering from two or more problems

The only way to find out what they are is to go thru the 10 things on BassCliffs page

If you haven't adjusted the valves, it needs to be checked. You'll be surprised atb how much easier the bike starts afterwards

As for the 2-3 vs 3-4 problem, do 2-3 run at higher rpm?

It's most likely a sync problem, but could be clogged jets

Download a manual for your bike and go to it

Northern WI? Minoqua? (one of my favorite places)

Edit: I see your carbs were never properly cleaned and you installed kits. Get them clean as per the tutorial, adjust the valves and I bet you'll be 100%
 
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The carbs were hand cleaned and then dipped. The bike shop did it. New carb kit. Tank lined and an in-line filter installed. They said they synced them but they probably were sick of me and very possibly never did it. It's 1 and 2 that don't pick up for a very long time at start up so I'm not understanding the question of higher RPM's. 3 and 4 are the two that are fired up and stay going. But if you mean, am I throttling it or the choke revs them up. No, they don't until somewhere around several minutes. Then they pick up. Once all four are firing she idles at 1100-1200. Smelled lean to. But we're waiting for the sync tool and we'll check the valves. Adjust sccordingly. Thank you to those replying.
 
And I'm in Superior Big T. Right on the Minnesota border and the tip of Lake Superior.
 
Hmm, I'd be suspicious of any shop that took 4 months to dip and sync carbs

A new sync will probably tell you what they might/might not have actually done to your carbs

Superior? Just east of the aerial lift bridge! I've driven thru there headed for the North Shore

Just read through Basscliff's link and website for more help and let us know what you find
 
Yes Big T. One in the same. The north shore is gorgeous especially on a bike ride! Can't Wait to get her running like she should! And yeah. They had the bike for four months! Finally I just bought a newer rack of carbs and they got it running finally! In October! And I got it back with more quirks then when it went in. The petcock was leaking from a bolt. They didn't put a gasket on it. The exhaust was leaking from #2 and #3 which we fixed and my sending unit(fuel gauge?) no longer works but did when it went in. It's been a battle that's for sure!
 
Don't ever take your bike back to those bozos again

The GSR will guide you in solving your problems

my wife wants to go back to Castle Danger for pie
 
Quick question. While looking over all the info on this site and BassCliffs as well. I'm now a tad confused. I know the cylinders go 1,2,3,4 from left to right while sitting on it. But looking at all the different info here I'm confused as to the coils. Do 1 and 2 get their spark from the coil on the left side? Same side as 1 and 2 cylinders? And 3 and 4 from the right? I see on BassCliffs page, his 850 is alternated. Is the 750 different. Just curious. Because with 1 and 2 being the culprit I suspect the coil is bad. Planned on checking anyway due to the suggestions of everyone but just want to get it straight. Thank you
 
So the left fires cylinder 1&4 and the right 2&3? Is it possible if the wires were switched that that could cause my problems? Or would it not run at all? Secondly. Since that's how they fire is it unlikely that the coil is the culprit as it is 1&2 being the problem children not a combo of 1&4 or 2&3? Thanks Big T! That cleared up a misconception by me. I haven't really "inspected" them yet and assumed the wires never crossed but simply dropped to each side. But see, looking around the info caused me to get a tiny light bulb to click and ask. This forum and site(s) are a great resource! Feel a tad dumb but hey, now I know!
 
Or is it possible that there is a problem with just half of each coil? Knowledge is power so you might get some off the wall questions in my quest for it. But I appreciate all the tutelage.
 
No, if a coil goes bad, the coil goes bad, there are not two halfs per se, in these bikes the coil fires both 1 and 4 or 2 and 3 at the same time, it is a lost spark arrangment, in other words, when it is time for cylinder 1 to fire, the coil fires both 1 and 4 at the same time, same with 2 and 3.
I doubt your issue is coils.You mat want to check plug caps though, you may have two dodgy caps there, they are cheap enough to replace.
 
Since all 4 cylinders run, even badly, you're going down the wrong way looking at the coils/ignition. Your bike ran great last year, then sat for months. Yes, the carbs can clog up that fast

I don't care if those bozos said they cleaned your carbs- what you are describing is clogged low speed circuits and/or a really bad sync

Did you get your sync tools yet?

Flyboy is correct - a coil is either good or bad, so that's not the problem

Go down to NAPA or Autozone and get a can of carb dip and do a carb clean yourself. Don't forget new O rings. Go back to post #2, read your BassCliff 10 things and the carb cleaning page and once you've done all that, you should be good to go
 
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No we havent got the sync tool yet. We're waiting for it to come. My buddy who is helping me and who's garage it is in right now is ordering one since he works on so much stuff he figures it'd be nice just to have one. So when that gets here we'll start there.

But even last year cylinders 1 and 2 wouldn't pick up for a long time while starting and warm up. But eventually they would pick up and stay going. Is there an internal settings with the floats,needles, jets inside the carbs that could cause them to not get fuel but then pick up? We're gonna go thru all the check list stuff as well. I appreciate all the insight. We'll get it. So I'll start with the carb cleaning, sync, valve adjustment and go from there.
 
So I'll start with the carb cleaning, sync, valve adjustment and go from there.
Click to expand...

Now you on the road to GS happiness, don't forget to keep us updated along the way, I will be following this one, can't wait for the post saying the first start up was flawless.
 
Your problem is not ignition related, it's not a carb sync issue and it's not a valve clearance problem.
Start the bike, kneel down beside it, remove the small (vac) hose from the carb end (block the vac port on the carb with your finger), suck on the vac hose for a few seconds.
See?
 
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