Engine surges up and down

[gsrick]

I followed the CV Carburetor Rebuild Guide and looked over the Mikuni BS(CV) Carburetor Rebuild Tutorial and the only thing I didn't do was lube the o-rings.(origional ones). The carbs looked pretty good before dipping and the passages flowed the cleaner from the spray can right in to my eyes pretty fast. Learned a leason on that pretty quick. The intakes looked like they are in good shape, but I'm new to working on bike engines. Can I try the gasket idea, just to eliminate the intake O-ring possibility? The intakes look better than the ones on my '78, they look like a previous owner used some silicone to seal it. I'll pull the carbs to check th jets, which one am I checking, the main jet? And how do I know if it is still stock? I'll check back in a little bit, to see what yall think. And thanks again for the help. Yall and this web site are a God send. Its easier to win the lottery than get ahold of my soon to be ex-mechanic. But thats another story for another time and thread. Oh yea, I origionally drained my tank using the prime setting on the petcock and it flowed pretty good. I also switched it during my test while it was surgeing, but had no effect. Be back later.

[keman]

The photos in the Carb tutorial show what jet is what. Main jet is right in the center once you remove the bowl . If you followed the tutorial, you have already taken it out once.

[bomber737]

When you are looking for air leaks yo might want to pull the cover off one of the end carbs and check the butterfly shaft seal. That is if you have pulled the carb rack apart since yo can't get it out otherwise. They should be supple and not split, there is also assembly grease on the shaft that you should not clean off. It helps the seal seal. I had this problem on a xj maxim and once I replaced those seals it idled nice.

[gsrick]

Keman is the main jet, the jet that you change, if you ad pods? And is there a number that I need to look for? I'll pull the carbs off in a few to see what I'm working with. Any thoughts about the gasket idea, on the intakes, if its a go, which material would you suggest I try? I'm trying to cure this problem as quickley and as cheaply as possible. If this is the problem, I will replace the o-rings, but I wont be able to get them for at least a couple of days. I have someone coming over tomorrow night, as a possible buyer, to look at it. I need to sell one of my bikes, so I can get a pick-up, and this the closest bike, I have to being completed. I wont sell my '78, shes my first love. Check back in a little, I think its going to be a long night.

[Nessism]

You can make gaskets but they won't seal for long. Long enough to sell the bike, but then you will be one of those "previous owners (PO)" we love to cuss.

As for the running problem, my guess is the jets are wrong in addition to the leaking intake pipe boot O-rings. Please check my signature for the "newbie mistake" thread.

[keman]

Cork gasket might work as a temp fix. . I'd let the buyer know what you did. The main will have a number on it. Not sure what. Perhaps one of the guys who owns a 1000 will have that info. You will need one or two steps up from stock mains to make it run right with pods.

You will get more cash for a bike that runs and idles, that you will if it still has issues.
The po may have even installed a dynojet kit. Look at the needles to see of they are adjustable.

[gsrick]

The jets say 115. Is that stock or what I should have?

[7981GS]

Stock exhaust with pods.
My 1000's with CV carb's like 122.5 main jets but, I ride from 4,000-10,000 feet.
My 1200G likes 125 mains.
My 850G needed 117.5's.

115's were stock on the 850 and 1000's.

Daniel

[gsrick]

I looked at the carb spects page on basscliffs webpage and it rates the stock jet at 115, the jets that I have. What should I use, larger and would local shops or Suzuki dealers keep these in stock. I might be able to get something from my mech. if I can reach him. Any suggestions? And could this be my headache?

[gsrick]

Man I type to slow for you guys, I'm at sealevel here in Fl.

[keman]

The jets say 115. Is that stock or what I should have?

That's stock. Either find a stock air box, or re-jet. You may find that the pods ARE your air leak! Or. .. you could spend the cash and put a dynojet kit in them and fall in love with the bike.

[7981GS]

Try the 122.5's first. If it is still lean, install 125's.
Get your main jets from Z1 enterprises. IIRC, they are about $2.00 each from them.
Give them a call in the morning.
I still think that you have more problems like fuel flow from the tank and vacuum leaks at the manifolds.
What is the float height and do the float seats work correctly? (do the springs on the needles work on all of them?)

Daniel

[gsrick]

Hey, I wouldn't leave the gaskets on perminately, I just wanted to be able to try something tonight to solve the problem. Well now I see I have a jetting problem. Looks like thats all I can do tonight. Whoops, its tomorrow already, here in Mickey land. So I'll let my fingers do the walking and see if I can find some jets around town during work. At least its finally pay day. I'll check for anymore posts in the morn. before work. Thanks again guys, yall have a good one.

Rick

[TheCafeKid]

Jets are only part of the problem when using pods. The stock needles are not designed to feed enough fuel for the additional air flow pods provide.
Please either find an airbox for the bike or purchase and install a dynojet stage 3 kit. The needles included in the kit are designed for pod filter intake set ups.
Otherwise the bike will NOT run to it's potential and you'll likely become frustrated quickly with trying to tune it.

[JJ]

Not that it has anything to do with the surging (that's lean from incorrect jetting or an air leak, or both), but the first thing you should do before tuning is check/adjust your valves.