Question about 1986 Suzuki LS 650 Savage

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My '86 suzuki savage won't rev up it just back fires

My '86 suzuki savage won't rev up it just starts back firing. I've cleaned the carb, petcock, plugs and checked all the wiring, is the ignition module bad?

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This could be a timing issue. I would remove the ignition/points cover and check for freedom of movement in the timing advance mechanism. A timing light will determine proper action. Shine on timing marks and rev engine. Mark such as "F" will move as engine is reved and some other marks such as "| |" will line up with timing mark.
If removing points/timing plate, mark plate position and where points wires go and remove points/plate/condensers as a unit. Test mechanism by twisting cam the points ride on. It needs to turn easily about 1/8 turn on its shaft. Look for free movement against spring tension and returns quickly when released.
If you disassemble advance mechanism, note cam position in relation to points. It can be assembled 180 deg out and not run. It must be free of grease and lubricants to work properly. Be prepared to adjust timing after reassembly.

Good luck
Techjoel

Posted on May 16, 2009

  • Joel
    Joel May 17, 2009

    It could also be carburator. The idle jets are seperate from the main jets and if they're cloged , the bike will idle but not rev. Cleaning the carbs is tricky but can be done at home. Refer to service manual because of the difficulty level.



    Good luck,

    Techjoel

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When I had my savage it backfired all the time. They are known for this. Make sure you fuel is not to lean. Just adjust the fuel. You should adjust that and put some sea foam in it or ethenol treatment since most of the gas is terrible these days. Running 91 octane will help. Also you will want to replace the muffler gasket too.
When you replace that it will smoke which is normal.
I sold mine but I know the bike pretty well from tearing it apart due to trying to fix it from not running properly. Let me know if you have any more issues.

Posted on Sep 03, 2009

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ALWAYS have a fire extinguisher on hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the
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< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the
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A “very helpful” rating for this answer? Thanks!

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Wont start.


Hi, Sounds like a sticky float valve in one or more of the carbs. When sitting, the carb overfills causing the revving when you start it, then it dies cause the carb isn't filling. Also check the exup valve in the intake, it could also cause the exact same symptoms but because of too much back pressure once it starts. Good Luck to you, hope this helps Fixya!

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