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bobber project! stopped in my tracks

  • Thread starter Thread starter derekp
  • Start date Start date
D

derekp

Guest
hellllo everyone. Ive been checking out this forum religiously and thought i might as well become a member and post some pictures of my bike!

i bought the bike for $1000 (81 gs 750L) for an after work hobby... which turned out into a full time job :D

the bike was sitting for a while, but since then Ive done all basic maintenance. (plugs, oil, drained old gas, replaced air box with pods, new battery) as well as cleaned the carbs out. the bike starts up fine every time and seems to be in very good condition.

good things aside, Ive been having trouble with acceleration. the bike will cruise smoothly but when I punch on the gas I just get bogged down. anyone have any other suggestions? I am mechanically inclined and have tried to wrap my brain around what could be wrong. most signs point to the gas/air mixture. i dont think it is running too rich, if anything its too lean.

i've read all about jet troubleshooting (which i dont want to hear again) and will do so if there arnt any other common problems or easier solutions i could try first! any other help would be awesome!
 
**PS this was happening Before i replaced the air box with pod filters!!**
 
welcome, wheres the pictures, i love to see bobbers as i build them too
 
Welcome to the GSR!!!

You are suffering from a lean condition which, may have several sources. First and most obvious, you introduction of the pod air filters. As you noted, you read up on the jets so...I won't bring that up again (though others will) :o.

How are the intake boots between the carbs and the head? You DO NOT have the intake o-rings so boot condition is most important.

What are you running for exhaust?

How did you "clean" the carbs?

Cliff will be along shortly with his nifty links and site, so hold on tight.

I'll leave you with these questions so as not to "beat a dead horse"...
 
I'm not going to bring up the topic of jetting either, but I will have to ask:

You say you "cleaned the carbs out". How? Did you:
- strip them down COMPLETELY
- dip them in Berryman's Carb Cleaner Dip (for a day each)
- put them back together with fresh o-rings from cycleorings.com
- install new o-rings on the intake boots
- synchronize your carbs

You say you have been "checking out this forum religiously", so you should have picked up on those points. Leaving crud in the carbs will affect fuel delivery, which is, essentially jetting.

You have also installed pod filters, which will lean out the mixture.

You have definitely hit the right diagnosis: "if anything its too lean".
The trick now is to find out which of several possible culprits is causing your lean condition, but we won't bring up JETTING.
noway.gif


beatdeadhorse.gif


.
 
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I wish we could get a sticky in this forum about the need to rejet when installing pods. Would save a bunch of time.
 
thanks for the quick replies everyone.

haha ive been waiting on my "super big welcome" or something along those lines. but i already have the link from another post on my desktop!:cool:
ya carbs have been stripped to the bone and thoroughly cleaned.

i still have the stock exhaust
and the engine runs super clean when at an idle or a slow but steady acceleration.
the problem also persists with the pod filters off completely

please remember that this problem occurred with the original air box! and yes the filter was clean! so PLEASE PLEASE PLEASE NO REJET COMMENTS!:-#

i am prepared to do the rejet, but just looking for some hopeful hints of something else that that may be the problem
 
besides the obvious (jetting) a jammed up petcock or vacuum line can cause poor fuel flow causing it to run lean.
 
Greetings and Salutations!!

Greetings and Salutations!!

Hi Mr. derekp,

I won't say a word about shimming the needles, re-jetting, air intake system leaks, or proper air restriction either. I'll just 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 Rebuild Series, and the Stator Papers. 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
 
OK, no more rejet comments, even though that is apparently what it's going to take to fix your bike.

One other thing to note, your bike will run worst of all if you have NOTHING on the intake of the carbs. With velocity stacks and proper jetting, they could be made to run well for racing, but weren't always so practical on the street. Pod filters, like you have installed, allow more air to flow. Somewhere along the line, before that air gets into the combustion chamber, it has to have more fuel added than normal, and that requires jetting the carbs a bit richer.

One other item that will affect the mixture actually happens after the carbs, so it will not require any change in jetting. That would be the intake tubes between the carbs and the cylinder head. Did you change them? Since you had this problem before ditching the airbox, it's a good possibility that they have not yet healed themselves.

.
 
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sorry guys. not meaning to come across as stubborn about the whole rejet thing. i would just like to hear some alternate ideas.

believe me ive read through the forums and when anyone has the same sort of question about the air/fuel mixture it results in immediate spamming about rejetting with no conclusion.


but since this problem occured with the stock airbox..........

maybe someone else has had the same problem
 
i know someone already said this but intake boots, are they solid, how are the o rings? another reason to run lean
 
FreshStart said:
i know someone already said this but intake boots, are they solid, how are the o rings? another reason to run lean
Click to expand...
It was brought up in post #4 that his bike does not have o-rings at the boots.

There are only sleeves from the carbs to the all-metal castings on the cylinder head.

.
 
Steve said:
It was brought up in post #4 that his bike does not have o-rings at the boots.

There are only sleeves from the carbs to the all-metal castings on the cylinder head.

.
Click to expand...

sry well the sleeve is rubber right. it could be cracked
 
rubber sleeves are fine. petcock is fine. vaccum hose works great

exhaust has slight backfire. (may or may not be consistent with acceleration problems)
this bike is in pretty good condition and seems to be well taken care of by the PO so minor things like seals and hoses are all accounted for as reliable

http://www.knfilters.com/search/product.aspx?Prod=RC-0984

those are the air filters i purchased. mostly because they allegedly do not need a rejet.

I KNOW THE ANSWER IS NEAAAAR!! :D
 
Hi,

I'm glad to see that you got the good set of pod filters. Excellent choice. They are much better than the cheap EMGO pod filters.

Sometimes you can install certain 4-n-1 exhausts without r*j*tting. But every time you remove the stock airbox and install pod filters a r*j*t is required.


Thank you for your indulgence,

BassCliff
 
ok yes jetting after installing pod filter. -- i understand that

pretend i never even put the pod filters in :eek:
because this problem still occurred when the STOCK air box was on the bike.

my most reasonable question to you would be

is there any point on a stock gs750 that you would have to jet? **with no intention to put aftermarket parts on**

:confused::confused:
 
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