Question about 2003 Suzuki DR-Z 125 L

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My 2003 Suzuki DRZ125 wont start, low compression- need fix

Last time I rode the bike it made a pop sound almost like a backfire, not locked up, drive train shifts, just wont start , and has low compression

Posted by Anonymous on


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Posted on Jan 02, 2017

  • 83 Answers

SOURCE: backfiring

backfiring means you have an air leak or a lean mixture. Look for leaks at the header pipes or perhaps a crack in the exhaust.
Cold air getting into the exhaust is usually what causes the backfire noise.
You may have a lean engine running situation but the bike would have other issues besides the backfire.
Let me know if you are having any other issues or if it just the backfire.

Posted on Jan 02, 2009

  • 190 Answers

SOURCE: backfiring and low compression in back cylinder

sounds if you have a burnt valve/s somewhere

Posted on May 13, 2009

  • 4 Answers

SOURCE: backfire during shifting between gears

could be few probs, carbon build up on piston crown try a good cleaner fuel additive, your exaust is leaking or blowing allowing air to be sucked back in on revdown as well as you could have a inlet fault overfueling leaving to much unburnt fuel to enter your exaust, might be simple fix by just replacing the air filter and checking for burn marks around the air intake.

Posted on Jul 10, 2009

  • 17 Answers

SOURCE: My suzuki intruder is missing backfiring on the

Did you sync the two carbs? If not the rear may be getting all the gas from the rear carb and none to the front. Twist throttle engine off and see if front carb cable is pulling the carb open.
Also unscrew the spark plug boot from the front spark plug wire and trim 1/8th inch off the wire and screw the boot back in. The plug wire end may be corroded on that wire.

Posted on Feb 08, 2010

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Have a1983 gs450L suzuki for a winter project. I got it to start after sitting for years. Took off mufflers and added straight pipes and put on airfilter pods plus went from 130 main jet to 140. Bike wont...

Go back to the 130 main jet. Be sure to check that both carb slides lift at the same moment. Also check to see if one carb is "driving" the other due to the idle screws not being balanced. Check the compression in both cylinders. It should be within 10% of each other. It is not likely that the bike has jumped time.

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I have a 94 nsr 125, it has a good spark, fuel is getting through fine, it will back fire and cough with a bump start but just wont run.

It's hard to say "this is it" without more info such as when did the problem start happening? Did it just happen out of the blue one day where you went out to start it and it wouldn't start? Did it happen after changing spark plugs? Were there any issues/symptoms the last time it was running and you rode it?

If you changed plugs, check the plug wires. They may be on the wrong plugs which mixes up the firing order and would definitely cause what you are seeing. If it just started happening out of the blue, were there symptoms of hesitation the last time you rode it? Any flat spots in the acceleration when you twisted the throttle? Did it bog at any point in the RPM range or backfire when you let off the gas? The backfire and cough are usually related to timing issues but you should have seen symptoms the last time you rode it if the timing started to get whacked.

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So is the battery...ignition needs "X" amount of Volts to run the ignition, the BANG you heard was the engine pre-igniting a fuel mixture in the combustion chamber - because the ignition didn't have enough juice to fire the plug...but the HEAT of the engine DID!
Replace the battery with one from WalMart and Ride!
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Hi ......... sounds like the petrol is igniting in the pipe, could be valve needs reground (carryout a compression check), leak in the exhaust system (all gaskets & joints good ?). What colour is the spark plug ? Have you recently put a new pipe, filter or re jetted the bike ?

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