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Running rich, I need some advice, please

  • Thread starter Thread starter gs450sjip
  • Start date Start date
Cdnpt1 said:
There should be 2 small washers as well that are going to be important, I believe the proper order for those on the mixture screw, from top to bottom is: spring, washer, o-ring. without the washer to give the spring a solid base you may have the same situation all over again. I am pretty sure that is the order of things, it's been a while, I think there may be a pick in the carb rebuild tutorails on BikeCliff's website.
Click to expand...

I'll take another look after I remove them from the cleaner. The o-rings are on the very edge next to the slot for the screwdriver. There were no washers, and no springs are readily visible. Maybe when they are cleaner I'll see them stuck in the bore. I Googled this and found at least two different styles, one with washers and the o-ring on the shoulder, and one without and the o-ring next to the slot. It will be late next week when I reassemble them and continue. I'm convinced they were assembled this way in 1980 by Suzuki. I'll keep the forum informed of the results. Thanks , gs450sjip
 
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I will take a look at my carbs when i get home tonight and get a pic of the set up if i can.
 
Looks exactly the same as the pic you posted. I have mine set at 2 1/2 turns out and the bike runs great. Once i get my tank patched i will do a proper colortune and vaccum sync on it and I expect it shoul really run. Great bikes.
 
Cdnpt1 said:
Looks exactly the same as the pic you posted. I have mine set at 2 1/2 turns out and the bike runs great. Once i get my tank patched i will do a proper colortune and vaccum sync on it and I expect it shoul really run. Great bikes.
Click to expand...

There is one difference in mine, they have no springs. Came from Suzuki that way. I am not too concerned, the screws have yet to move or loose adjustment. Next week I'll reassemble them and see if there is any chasnge for the better.
Thanks gs450sjip
 
No washers in mine either... and exactly the same as that pic.

The spring is there to keep tension and prevent it moving I believe although I could be wrong.
 
pete said:
No washers in mine either... and exactly the same as that pic.

The spring is there to keep tension and prevent it moving I believe although I could be wrong.
Click to expand...

Gents,

Just an update, I had a set back. I dropped a carb removing it from the dip, ugh! It snapped off the enrichener pick-up tube. I am waiting on a replacement body I purchased from ebay. As soon as I get all the pieces again, I'll reassemble and install. gs450sjip
 
Bugger! Hopefully you don't have to wait too long and can get back into it soon...
 
pete said:
Bugger! Hopefully you don't have to wait too long and can get back into it soon...
Click to expand...
Pete, and All,

Just an update, I received the replacement carb body, it is exactly like the original. It also does not have a spring on the mixture adjustment screw. So , I can't say it's missing, that's three I have without springs. Doesn't seem to be an issue, the screws have tension on them without the springs. It's in the carb dip now. I may replace the valve cover gasket while the tank is off. Most likely next week before I restart it.
GS450SJIP
 
Weird... I have never seen nor heard of them without springs before! Maybe the earlier revisions didn't have springs? Anyway... good luck! Looking forward to the result...
 
pete said:
Bugger! Hopefully you don't have to wait too long and can get back into it soon...
Click to expand...

Pete and All,

It's back together and there are changes. I have the floats at 27mm, the mixture screws are set at 2 turns out. The carbs are clean, all passages are clear. It starts quickly, without choke, then settles into a smooth even 2800-3000 rpm ''idle". It stays there for awhile then slowly slows to 1200 rpm and the enrichener is needed to keep it from stalling. After is warms, I tried to rev it some which it does, but it hangs at the fast speed around 3000 rpm, it does not return to lower speeds easily. I am going to check the slack or absence of, in the throttle cable/twist grip. The exhaust does not burn your eyes as before, so it seems leaner. This is with the air filter and airbox lid back in place. Right now, I'm thinking/hoping it is a mechcanical issue, binding throttle, (I tightened the angle iron gang plate after I tightened the top covers and cable bracket) or not enough slack in the cable, lube the cable etc.. Once I get a consistant idle, I can adjust the mix screws.
The cam cover leak was fixed with Loctite 518 anerobic sealer without a gasket. I did not have much time to fiddle with it yesterday. Any advice is greatly appreciated.
gs450sjip
 
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"Quote-- then settles into a smooth even 2800-3000 rpm ''idle". It stays there for awhile then slowly slows to 1200 rpm and the enrichener is needed to keep it from stalling. After is warms, I tried to rev it some which it does, but it hangs at the fast speed around 3000 rpm"

It is good that you have changes but what you are now describing is a lean condition, a hanging idle is a sign of a air leak somewhere.
 
hjfisk said:
"Quote-- then settles into a smooth even 2800-3000 rpm ''idle". It stays there for awhile then slowly slows to 1200 rpm and the enrichener is needed to keep it from stalling. After is warms, I tried to rev it some which it does, but it hangs at the fast speed around 3000 rpm"

It is good that you have changes but what you are now describing is a lean condition, a hanging idle is a sign of a air leak somewhere.
Click to expand...
Yes and no. I agree it indicates a lean condition. What procedure was used to set the idle mixture screws? The highest rpm method listed on BikeCliff's site is for VM carbs, not CV carbs.
 
hjfisk said:
"Quote-- then settles into a smooth even 2800-3000 rpm ''idle". It stays there for awhile then slowly slows to 1200 rpm and the enrichener is needed to keep it from stalling. After is warms, I tried to rev it some which it does, but it hangs at the fast speed around 3000 rpm"

It is good that you have changes but what you are now describing is a lean condition, a hanging idle is a sign of a air leak somewhere.
Click to expand...

hjfisk,

Yes, I agree, it is a possibility. I will check for leaks, It did not rev as before, seemed sluggish without power. I did hear a odd , very slight, popping or spitting sound on occasion. It was never there before, so I think I'll loosen all clamps, try to reposition the carbs, then retighten them.
Thanks, GS450SJIP
 
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koolaid_kid said:
Yes and no. I agree it indicates a lean condition. What procedure was used to set the idle mixture screws? The highest rpm method listed on BikeCliff's site is for VM carbs, not CV carbs.
Click to expand...

KOOLAID KID,

I just backed them out 2-turns after seating them lightly. They were not on the bike yet. There is no point messing with them until I get the air leak corrected. I suspect the right carb clamp is stripped, I could not tighten it nearly as tight as the others. I'll check after work today. GS450SJIP
 
I asked because I had the same issue on my GPz. I first checked for air leaks, had none, then discovered that the Fast Idle method was at fault. I figured out how to set them correctly and now they are perfect. I wrote a procedure up on how to set them correctly if you are interested.
 
koolaid_kid said:
I asked because I had the same issue on my GPz. I first checked for air leaks, had none, then discovered that the Fast Idle method was at fault. I figured out how to set them correctly and now they are perfect. I wrote a procedure up on how to set them correctly if you are interested.
Click to expand...

KOOLAID KID,

I am all ears !! Yes, I need some guidance here, all my other bikes are BSA's, the Amal carbs are quite simple compared to these Mikuni CV types.

my email is: jipjap@netzero.com

thanks, gs450sjip
 
Here is the thread
I asked BassCliff to post it on his site, but he has not gotten around to it yet.

Amals, geez. I remember a friend of mine tickling them on his Bonneville 650 back in 1969. Hehe.
 
gs450sjip said:
hjfisk,

Yes, I agree, it is a possibility. I will check for leaks, It did not rev as before, seemed sluggish without power. I did hear a odd , very slight, popping or spitting sound on occasion. It was never there before, so I think I'll loosen all clamps, try to reposition the carbs, then retighten them.
Thanks, GS450SJIP
Click to expand...

Gents,

I discovered an air leak on the right carb boot right at the carb to boot joint. Spraying carb cleaner changed engine speed noticeably. I replaced a split one months ago, now this one is not sealing. So, I just placed an order for a new one. The saga continues, but at least it's starting to make sense. gs450sjip stay tuned......
 
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