Question about 1982 Suzuki GS 650 G Katana

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Put on headers,and pods 1981 gs 650 e need jetting info

Put on Mac 4-1 header,,baffle in,took off complete stock air box,now set up with the rubber v-stacks that were part of the stock set up,,bike wants to start but wont stay running at idle,,put in VERY large main jet and the motor ran away,,,what about the pilot or low speed jets (very small)stock ones,cant read the numbers on them if they are there at all the numbers on the main jetic110..hope you can advize..cvcarbs

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Posted on Jan 02, 2017

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SOURCE: 1983 suzuki gs 750 New airpods and jets. Bike not running right

You are dealing with Suzuki vacuum carbs, you cannot just replace the air box and re-jet. What you are running into is there is no pressure to raise the diaphragm because there is no restriction to create such vacuum. Either put the stock box back on or go to the biggest main jets you can buy. Sometime even when you get stage 3 jets you still have issues. Vacuum carbs are not made to run with no restrictions.....putting aftermarket exhaust on it will make things much worse.

Posted on Sep 30, 2009

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SOURCE: What jet sizes???? GS750.

i put 115 main jets in my 77 ge 750 and it will run but was told to jump up to 140 with pobs and 4into1 pipe (SM6) race pipe at the low side run 130 main and leave the stock pilot in. i rorde mine from NE to SD roude trip about 1300 miles got about 62 MPG with 115 jets jumping up to the 140 will drop the MPG but lets be real im not looking for MPG. hope this will help.

Posted on Nov 18, 2010

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I took off air box added airpods with stock exhaust on a 1981 suzuki gs 650 what size main jets should i replace with


Richard, I would suggest you go with a stage 3 jet kit for improved air flow. Ebay has them for a great deal. I'll post a link. Good luck. ^^
Dynojet Stage 3 Jet Kit For Suzuki GS650 GS 650 1981 1982
25827945-ug2cc0zr24d5nrk3krvdzvs0-1-0.jpg

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Only Rev's up to 8k RPM


wot do you mean by ( header ) , do you mean a tuned exhaust system or a tuned cylinder head ?? if exhaust then yes increase the of the jets and replace the airfilter to KnN free flow filter or similar type ! find out the maker of exhaust and contact them for info to wot jets required ! could fit a larger fuel feed tap and pipes to help flow of fuel too !

Dec 31, 2013 | 1984 Suzuki Gs 550 L

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Air intake?? help


it need bigger main jets in the carbs now since it breathes more air in. otherwise youd be a lot better off to find and install the correct airbox. pods aren't all they are made out to be

Mar 04, 2018 | 1981 Suzuki GS 750 L

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What is the factory jet size for a suzuki gs 850gl


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Mar 24, 2013 | 1978 Suzuki GS 750 E

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I took off the factory mufflers on my suzuki m50 that is fuel injected and put straight pipe on it. Drove it for awhile and now it wont run unless the air cleaner is off. How can I adjust it?


There is no adjustment on the fuel injection model unless you put it on a computer and have it remapped.

When you put straight pipes on the bike, you did away with a baffle that was in your stock pipes.
so now there is no back pressure, and your bike is breathing now.
But it can't breath if it can't get the air.
When you remove the air cleaner it breaths.
So you need to purchase a High-Flow air filter.
If you have an airbox, you may need to eliminate that as well, but start with just the high flow fliter first.
When putting on straight pipes and a high flow air filter , you will also need to increase your carburetor main jet size at least 1-2 numbers:example:stock 120 go to 122.
if you don't increase the main jet your bike will run lean and hot.

Once done you'll be able to crack that throttle and the whole neigborhood will here ya.
Loud pipes save lives.
Best Regards
Big Al

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2 Answers

I took the stock air filter off my 2000 Suzuki Katana 600 and put a K&N air filter in it, when i accelerate it stalls out a bit before kicking up to speed. a slight lag then go.


Changing to a K&N air filter changes the air/fuel mixture for your bike, and you're probably hitting an overly lean spot before things start to even out. For bikes still running carburetors, which I think you have, you can compensate for this by changing to a slightly larger idle jet. Your main jet is probably fine (it's kicking in after the lag); it's the crossover from idle to main jet that's causing the flat spot.
Talk to your dealership parts counter to get recommendations about jet settings. They may suggest, for example, to keep your existing idle jet and go with a different main jet. Expect to try a couple different setups to find one that works best for your bike and your riding style. I would highly recommend keeping your original jets, though, in case you ever go back to the stock air box.

May 09, 2011 | 2000 Suzuki GSX 600 F (Katana)

1 Answer

2009 MODEL FLHTCU WITH: K & N FREE FLOW AIR FILTER, VANCE & HINES SLIP ON WITH 2 1/4" BAFFLES. PROBLEM IS BACKFIRING ON DE-ACCELERATION. SETTINGS ARE AT FACTORY SETTING FOR AFTER MARKET AIR...


Settings ?? TFI .. I have same bike K&N ac wild pigs 2 1/4 bafle dealer down load my settings 2.5 ..3..4.... I hear burbling not backfiring .. I have welded a splitter at end of baffle ..

May 04, 2011 | Harley Davidson Grand Majesty 400...

1 Answer

2001 heritage clssaic starts and idles fine when you put it under power it bogs out after 1/4 trottle pull the choke out and you get to 1/2 trottle before it bogs and if you hold in bog zone it will die...


It sounds like one of two things. One, the jets in the carb may be clogged. The way you're describing it, it sounds like the main jet in the carb is clogged. You're running off the slow speed jet. When you open the choke (enricher) you're adding a bit more fuel and air improving the performance a bit. If it's te carb, it needs to be completely disassembled and soaked in a professional quality carb cleaner and thoroughly gone through to ensure all passageways are clear.

The next problem is the exhaust system. I've seen bikes do this before when changing a camshaft. Remove a stock cam and install a high performance cam and the bike will no longer run. The reason is that the baffles in the exhaust system were so restrictive that the engine could no longer "breathe" with them in there. Removed the baffles and the engine ran fine but was too loud for the owner's liking. We replaced the stock system with a free flowing high performance muffler system and the bike ran great.

Good Luck
Steve

Mar 17, 2011 | 2001 Harley Davidson FLSTC - FLSTCI...

1 Answer

Take to long to start.. takes almost ten minutes of kick starting... electric starter wont turn over to start bike yamaha ttr 125


The TTR-125 Carburetor's Run Lean by design. Mine had the same issues till I found a post on Thumpertalk.com on Carb and air box Mod. This is a good starting point on gets; 110 and 112.5 main and 17.5 pilot. But you must check spark plug coloring to make sure the jetting is correct. Check spark plug after the bike has been ridden for a wile. I also took out the stock baffle and replaced it with exhaust tip and now it fires up after a few kicks and worms up in a few minutes.

Dec 15, 2010 | 2005 Yamaha TT-R 125 L

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