Question about 1990 Suzuki GSX-R 750 L

2 Answers

90 gsxr 750 wont start, Exhaust seals?

I have a 90 gsxr 750 it wont start but i do not have any exhaust gasket could this cause the problem to much back presser or is it something els

HELP!!!! thanks

Posted by on

  • 1 more comment 
  • destiny92782 Feb 13, 2009

    thanx for the advice but i got it runing it was no fuel

  • Anonymous Mar 17, 2014

    k9 gsxr 750,f1 light keeps appearing.i'd like to know how to bypass so fault code shows up on the screen.can you help me ?

  • Anonymous Mar 17, 2014

    I would like help locating dealer mode plug would be magic



2 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 3 Answers

The exhaust gaskets really should have nothing to do with whether your engine will not start. However I assume that by not starting it is turning over smoothly like it should when you try to start, having covered that most motors will not start because no fuel, no spark, or no air not withstanding some major mechanical failure in the valve train or timing or piston, cranks et al..
Trying checking for the obvious first fuel, spark, air flow. then go from there hope this helps

Posted on Feb 12, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Suzuki Master
  • 767 Answers

Hi Destiny92782,

Exhaust gaskets wont make your bike not to fire up, the gaskets are there to make the fitting of the exhaust pipes tight and not leak.
You will need to check on your bike the following:-
(1) If gas is in the float chamber or even if you pull out the spark plugs it should be wet with gas after several cranking.
(2) check if theres sparks at the spark plug, remove one of the sparkplugs and ground it thn crank her up and see if theres spark.

Knight. (Yamaha Seca XJ750A 1981) the same as XJ750R in USA

Posted on Feb 12, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Hi my 1999 Honda ace deluxe 750 blows blue smoke out exhaust when warmed up could it be valve adjustment

No that is either poor ring seal or loose valve guides, you need to rebuild the engine most likely.

Nov 10, 2016 | 1999 Honda VT 750 CD Shadow A.C.E. Deluxe

2 Answers

Why is my 2000 kia sephia blowing blue smoke from the tailpipe. it has 86,000 miles. the check oil warning light is on even though the dipstick reads full.

The most common cause of blue exhaust smoke is oil leaking past engine seals and into the cylinders where it then mixes and burns with the fuel. This is most frequently seen in older or high mileage cars with worn seals and gaskets. It only requires a very small amount of oil leaking into the cylinders to cause excessive blue exhaust smoke.

Blue exhaust smoke only at start-up can indicate worn piston seals or damaged or worn valve guides which may also cause a rattling noise. An external engine oil leak can drip onto hot engine and exhaust parts causing what appears to be blue exhaust smoke. Other possible causes of blue exhaust smoke include: piston wear, worn valve seals, a dirty or non-functioning PCV valve, worn piston rings, an intake manifold gasket leak, worn engine oil seals and possibly even head gasket failure.

Oil leaking into the cylinders can cause a rough idle, misfire and fouled spark plugs. In addition, a reduction in power and oil loss can be indicators that the blue exhaust smoke is caused by an internal engine oil leak. Internal engine oil leaks can also allow fuel to mix with the oil in the crankcase which will degrade the oil and prevent it from adequately protecting the engine.

Operating a car with a severely dirty oil filter, air filter or improperly functioning PCV valve can also sometimes result in engine oil blow-by, oil loss and blue exhaust smoke. Periodically checking the engine oil level with the oil dip stick will indicate if there is excessive oil consumption. Higher viscosity engine oil can sometimes temporarily reduce the amount of blow-by; however, this is not generally recommended. Excessive blue exhaust smoke indicates a possible internal engine oil leak that should be inspected by an ASE certified mechanic.

Dec 08, 2014 | 2000 Kia Sephia

1 Answer

2005 Honda VT 750 Shadow Aero black smoke exhaust

Hi, Anonymous your instrument gauges and lights can alert you to most electrical and engine issues they can not warn you about failed engine gaskets or seals so your engine has to resort to old fashion alert methods of colored "SMOKE SIGNALS" here is a breakdown of their meaning:
1. COLORLESS OR SLIGHTLY BLUE SMOKE on start-up means your air/fuel mixture is at the right composition and everything is well burnt in your combustion chamber.
2. BLUE SMOKE on startup is usually caused by failed valve seals dripping oil into the combustion chamber when the engine is not running.
3. YELLOW OR BROWNISH SMOKE at start-up means your air/fuel mixture is too lean. Too lean means that there is low fuel but high air mixture in your combustion chamber.
4. WHITE SMOKE on startup may be caused by a blown head gasket allowing coolant to enter the combustion chamber and may start dripping out of the exhaust pipes or mufflers. Smoke while riding is usually caused by worn out or damaged valves, seals, guides, pistons, rings, or cylinder walls.
5. BLACK SMOKE on startup is usually caused by too much fuel in the combustion chamber this can be due to air/fuel mixture adjustment too rich, accelerator pump improperly adjusted, faulty choke/enrichner or not in the off position, air filter dirty and clogged, faulty carburetor float needle and seat, pilot jet too large, fuel injectors leaking, smoke while riding is usually caused by the main jet being too large or a damaged carburetor.
It should be noted that aggressive or abnormal throttle operation will cause these conditions to manifest themselves exponentially.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the links below. Good luck and have a nice day.
Identifying Smoke
Honda shadow exhaust leak backfiring fix
Honda VT750C2 Shadow Spirit Service Manual
Honda VT750C2 Owner Manual

Jan 12, 2014 | 2005 Honda VT 750 Shadow Aero

1 Answer

I have a 1991 suzuki gsxr 750, Just changed sparq plugs, and bike Is blowing white smoke.What might be the problem?

White smoke is most likely antifreeze. Blown head gasket most likely. Does the exhaust smell like antifreeze?

Aug 01, 2011 | 1991 Suzuki GSX-R 750 M

2 Answers

Hello, The nighthawk 750 1993, is backfiring even after I chaged the jets, I when from 35 jets to 38 size jets and main when from 112 to 122 size jets, I put on 4 to 1 pipes and individual air filters, ...

Backfiring is caused by unburned fuel in the exhaust. In an exhaust replacement air leaking past the exhaust gaskets in the head igniting the unburned fuel, will often be the cause of the popping. Be sure the exhaust gaskets are sealing. By removing the vacuum on the intake side of the carburetors you have altered the way the vacuum pistons rise and fall. You may have to rejet several times to get the mixture right (just to get the machine to run). The vacuum at the intake is very critical to the correct operation of the vacuum carburetors on the motorcycle. Consider putting the air box back in and using a K&N style air filter . This may be the best solution to get the machine to work properly with the new exhaust and current jetting.

May 05, 2011 | 1993 Honda CB 750 Nighthawk

1 Answer

Is popping or backfire normal?

Two things can cause popping or backfiring on deceleration. The most common is air leaking into the exhaust through the exhaust pipe copper o-ring gaskets. This typically happens when the exhaust is replaced without removing the old ones (doubled up) or simply reusing the old gaskets and they don't seal. The other thing that can cause popping is bad air cut diaphragms on the carburetors. If they are old and sticky or have holes in them they don't properly shut off the gas on deceleration causing the backfire.

May 06, 2010 | 2002 Honda VT 750 CD Shadow A.C.E. Deluxe

2 Answers

82 GPZ 750 R1 w/ mac 4/1 exhaust Will the lack of exhaust gaskets affect compression?


But it will affect how well it idles and reduce your torque due to a lack of back pressure.

May 05, 2010 | 1976 kawasaki Z 750

1 Answer

I rebuilt my motor on my 2002 gsxr 750 over the winter last saturday i took it out and ran fine let it sit over night and in morning wouldnt stay running and back firing and shooting flame out exhaust

Most likely cause is a fouled spark plug. Engines fresh out of overhaul often have this happen as engine oil gets past piston rings that haven't seated in yet.

Remove the spark plugs, clean or replace them. Also check for cracked, damaged, or dirty spark plug caps. This can also cause misfiring and flames shooting from the exhaust.

Mar 09, 2010 | 2002 Suzuki GSX 750

1 Answer

Can i put a gsxr exhaust on my 2006 750 katana???

probably but search the forums at or post same question there and you will find an answer also i believe has an interchange chart. if you want a free manual download for your bike here

Apr 13, 2009 | 2006 Suzuki GSX 750 F (Katana)

Not finding what you are looking for?
1990 Suzuki GSX-R 750 L Logo

518 people viewed this question

Ask a Question

Usually answered in minutes!

Top Suzuki Experts


Level 3 Expert

76846 Answers

Arnie Burke
Arnie Burke

Level 3 Expert

4536 Answers


Level 2 Expert

83 Answers

Are you a Suzuki Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides