Question about Suzuki GSX-R 750 Motorcycles

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My 86 GSX R 750 won't run , there is lots of spark and fuel but it won't fire! how do i see if it is the timing , because there is suction at the muffler when it turns over. O r does someone know where i can down load a service manual for free?

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  • gavin jones
    gavin jones May 11, 2010

    The timing shouldnt move. If you mean valve timing the chain and tensioner has to be pretty knackered before it will jump teeth check the valve clearances, if any are huge it may have a stuck valve, or try a compression test, to give you somewhere to start from

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Always remember if you have "Good Spark": (big fat Blusish spark), not reddish-purple...and "Excellent fuel delivery" be it carb or injected then it has to be a compression problem. Could be valves not closing all the way, you may have to take the top end off and to inspect. Does the bike at least push start but run. if it runs it may be a fuel issue but if it doesnt even push start then it got to be a compression problem.

Posted on May 08, 2010

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1 Answer

There is spark and fuel but not running


Two other items left compression and valve timing. If the only thing that happen is that it set, for a long time, then the fuel may need to be replaced and/or carbs cleaned. .

Jun 30, 2014 | 1992 Suzuki GSX-R 750 WN

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Cylinder firing not


Hi, Anonymous you need "FIVE" things in order for a cylinder to run properly:
1. FUEL: in order to validate your not getting fuel spray some starting fluid into the air cleaner and hit the starter button, if it fires up and runs for a few seconds then you know you have a fuel delivery issue.
2. SPARK: remove the spark plug and with it connected to the spark plug cable ground the threads to something metal you should see a bluish white spark if not you have a faulty spark plug, spark plug cable, ignition coil, condenser, CKP, ECM, sensor or the wiring in between.
3. COMPRESSION: you must have at least 80-100 PSI for most bikes if not perform a leak down test you may have a burnt or bent valve or hole in the piston or broken rings.
4. CAM TIMING: confirm your timing marks are aligned to see if the cam chain or adjuster are worn out and the chain has skipped a couple teeth.
5. IGNITION TIMING: on older bikes check to see if your points have not closed up, timing plate has not become loose and confirm with a timing light for proper retard and advance functions, on newer bikes where timing is controlled by an ECM and is nonadjustable check you CKP, TPS, MAP, O2, sensor or it's counterpart for integrity.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
http://www.motorcycleforum.com/59-motorcycle-repair/98336-one-cylinder-not-firing.html
https://forum.motorcyclenews.com/topic/32694/one-cylinder-not-firing
One cylinder not firing GSX 750
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1 Answer

Replace headers, power Com V and auto tune but leaking petrol?


Hi, Greg love that first name, you need "FIVE" things in order for a cylinder to run properly:
1. FUEL: in order to validate your not getting fuel spray some starting fluid into the air cleaner and hit the starter button, if it fires up and runs for a few seconds then you know you have a fuel delivery issue. Multi carbs bank should be bench "SYNC"
2. SPARK: remove the spark plug and with it connected to the spark plug cable ground the threads to something metal you should see a bluish white spark if not you have a faulty spark plug, spark plug cable, ignition coil, condenser, CKP, ECM, sensor or the wiring in between.
3. COMPRESSION: you must have at least 80-100 PSI for most bikes, multi-cylinder engines should be within 10-15% of each other if not perform a leak down test you may have a burnt or bent valve or hole in the piston or broken rings.
4. CAM TIMING: confirm your timing marks are aligned to see if the cam chain or adjuster are worn out and the chain has skipped a couple teeth.
5. IGNITION TIMING: on older bikes check to see if your points have not closed up, timing plate has not become loose and confirm with a timing light for proper retard and advance functions, on newer bikes where timing is controlled by an ECM and is nonadjustable check you CKP, TPS, MAP, O2, sensor or its counterpart for integrity.
For more information about your issue and valuable "FREE" downloads that you will need for viewing and printing please click on the blue links below. Good luck and have a wonderful day.
Suzuki GSX R750 Service Manual
OEM parts for Suzuki
http://mybikemanuals.com/suzuki/suzuki-gsx-owners-manuals
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Jul 20, 2017 | 2010 Suzuki GSXR750

1 Answer

My suzuki gsxr 750 sat all winter and i didnt winterize it at all. the battery died... i charged it and my bike just wont start. It cranks over just won.t start. What should i do?


check spark plugs,check for spark. check fuel is good. possible needle and seat gummed up in carb float bowl. disasemble and clean with brake or carb cleaner.do not change float level. re assemble ,you can use the cleaner to help to fire the motor with a shot through the carb. make sure you cleaner says flammable. good luck.

Mar 22, 2010 | 2007 Suzuki GSX-R 750

2 Answers

Gixer 750/m.got fuel and spark but wont fire .Cheers


Are your valves and timing adjusted properly?

Nov 16, 2009 | 1989 Suzuki GSX-R 750 K

1 Answer

My 94 gsxr750 wont start it is getting fire the inside of the gas tank looks new no rust. when turning over the engine it dont even sound like it is hitting on anything like the timing is off..i checked...


It needs spark, fuel and air to run. First check all the spark plugs are firing. If they are you could try spraying some carb cleaner in the air filter. If the bike starts up briefly doing this it means you must have a fuel delivery problem.

Oil on the spark plugs is a bad sign. If the method above returns no results the next step would be testing the compression on each cylinder. This requires a special gauge which is relatively inexpensive and easy to use. Hopefully one of these will give a clue as to what is going wrong.

Sep 25, 2009 | 1994 Suzuki GSX-R 750 WR

1 Answer

I have a GSX 750 that has been running rough. It


It has a timing chain but that is not the problem. The fuel system is probably the problem. Water / trash in the gas, weak fuel pump, plugged injectors, gas tank vent partially plugged, dirty air filter? The spark plugs are also a likely target. I would start there since it is a cheap fix and you can do it yourself.

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1 Answer

Ignition destroyed no start no fire


is there a black wire make sure its not connected might be earthing it

Jul 20, 2009 | 1996 Suzuki GSX-R 750 T

2 Answers

Will not rev over 8000 rpm


This is hard to tell without riding it to feel the condition. Here are a few things that come to my mind.

1 Spark plugs or ignition system not able to handle the higher demands of the higher RPMs

2 battery or charging system not creating enough power to meet the higher demands of the bike (ignition and fuel systems)

3 Fuel flow to the carbs is low or the main jet is clogged.

4 valve adjustment and or valve timing

May 18, 2009 | 1998 Suzuki GSX-R 750 W

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