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Posted on Aug 22, 2010

1977 Suzuki GS750 idles high when hot The engine is

The engine is set to idle appropriately when the choke is off. After travel wherein the engine is now hot, the engine idles at about 2000 rpm at all times. Not a big issue except at intersections waiting for the light to change, but it would be nice to run correctly. Additionally, the engine has a slight, not loud, knocking after warm up when idling. Otherwise, runs well off idle. I have been told it is side play in the camshaft. Mileage, approx. 50,000. Valves recently adjusted by Suzuki dealer. Thanks, Willard

5 Related Answers

Anonymous

  • 1 Answer
  • Posted on Dec 30, 2008

SOURCE: have an 06 Suzuki Katana

Not for sure but u might try to re jet the bike.i own a 98 suzuki bandit 600s and it also is really cold hearted. those bikes are unfortunately known for that problem.not that it was much help but u might try contacting Dales Holeshot Performance he specializes those types of bikes he also sells the jet kits.
i would also try to adjust the idle slightly higher hope this at least helps

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Anonymous

  • 6 Answers
  • Posted on Jan 01, 2009

SOURCE: stalling out

u have the mixture screw wound in to far. its normally located on the bottom of the carb. try winding it out half a turn at a time once the bike has warmed up. also turn the idle screw out a quarter of a turn at the time its in to far thats why it idles at low revs. the choke is needed to keep the air fuel mixture right thats why u are having to leave it on for so long. hope this helps.

defadad

Harry Goodwin

  • 353 Answers
  • Posted on May 23, 2009

SOURCE: Won't idle especially when hot.

not real sure but you may be sucking air from a hose or loose manifold





















Neal Wiles

  • 32 Answers
  • Posted on Jun 20, 2009

SOURCE: I just got an 83 Suzuki GSX 750 SE, I am looking

http://www.alpha-sports.com/suzuki_parts.htm

give this a go you can get your part numbers from here

Anonymous

  • 375 Answers
  • Posted on Jun 29, 2009

SOURCE: I need tuning specs for my 1982 suzuki gs 750.

You need to fix the fueling first - without fuel it won't run!
Your other problem sounds like an air leak - either the manifold or the carb. Check by spraying WD-40 or CRC at the manifold and carb join while the bike is running - if the revs change (either up or down) you have a leak.

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1977 Suzuki GS750 aftermarket gas tank.

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When the throttle slide is set too high on the engine side, it can cause the bike to idle high, as you mentioned. This is because the slide is not allowing enough air to enter the carburetor, which can cause the engine to run rich.
To adjust the throttle slide height, you will need to follow these steps:
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Idles erratically, just changed rocker cover? gasket .now it revs high, not sure why, can I fix this suzuki swift 1990

rocker cover, i edited it for you. (my guess high is over 800rpm)?
hot engine or cold engine or both?
if hot is water temp, 180F? or stuck at 149F"? too low...
are you in neutral or drive? or park.?
which engine?. is it there are many sizes used on Swifts,
one if the largest number of engines on car.
my guess is a "G" engine family.
High idle is usually a vacuum leak,
is this a CARB or EFI engine?, (TBI, throttle body injection:?)
if it is EFI and if TBI
any air leaks will cause too fast hot idle.
here is the list: EFI only ! electronic fuel injected.
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  2. sticking ISC, idle controller.
  3. TPS set wrong, and no longer has a working idle switch.
  4. ECU in Limphome (if CEL lamp (dash) glows running , bingo)
  5. PVC hose fell off.. sucking in fresh air , and higher idle.
more if you have answers to what your engine and driveline
consist of.




here is the lineup
GEN2 Swifts (the G family used)
1.0 L G10 (LP2) I3
1.0 L G10T (LS3) turbo I3
1.3 L G13A/BA (L72) 8V I4
1.3 L G13B/G13K 16V DOHC I4
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When I start the engine of my Toyota carina ,it runs alright but after moving for about 3 to 4 kilometer, the engine starts junking ,when it's switched off the engine falls to start,but after

wow , 1977 , we dont get 77 cars here ever, they are relics.

a BLAST FROM the pass, (i have 66 and 68 cars,now, so....)

if the engine is good, compression near spec> x4 150PSI min?

The fsm covers all these numbers, so you look them up. ok?

and spark is good.,!

then the carb is bad. fixing 1977 carbs\' (done 100) are very hard.

lacking kits, and good cleaners (illegal here now).

lacking parts, inside, (toy dont sell em;\')





CARB 101:

Stalls only hot?

choke not going to full open hot? fix it or upgrade to manual.

float level wrong,? fix it. (google that)

JET, nozzles and emulsion paths blocked? or loose?

JET main fell out, and is rolling around in bowl?>

fuel pressure too high?, some shade tree used EFI pump:? oops.

fuel pressure too low 1psi, (read toy spec, get it right)

air leaks at the carb base gaskets, or there in intake.

idle set too low?



(bad carb)

how is that,?
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tombones49_131.gif
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I have 2 x swift GTi's, with high rev problems!!

Well, depending on your market of course, I'd still be fairly sure you do have a choke! It is located on the rear of the intake air plenumn chamber and has 2 small coolant hoses that come up from underneath - one comes from the thermostat housing area, and the other goes to the water pump area. Disconnect these and make sure you can blow easily through the choke unit. Like most Suzuki thermo-wax choke elements, they need hot water to contract, and in so doing, reduce the amount of extra air let into the engine. Unfortunately, it sounds like you may have adjusted the throttle stopper screw (it may have had a tamper-proof cover on it). If you have, the throttle plate-to-barrel clearance should be set back to as close as what your other car is by measuring the clearance with feeler gages. Let me know how you get on. I've got a 1991 version of the same and I'm in Australia.
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Idle problem when warmed up

Hi there!

On the carburetor, there is an idle knob. Make sure it is not set too high. This is normal during a cold start so make sure to adjust the idle knob back at 1,100 RPM after your engine is warmed up.

Also, make sure the choke system is clean and is free. Throttle cable should have an allowance of just about .8cm.

The engine idle may also be controlled with the thermostat connected to the grill fan. it will normally idle up to about 2,000 rpm when it senses that the engine is too hot but not 4,000.00 make sure this system is working well.

let me know if this helps
-levibit
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