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Hi i have a 2001 yamaha vt 600 f snowmobile backfiring alot what could it be and whats the worst ot could be?

Plugs carb boot had fell off new gas running to flush out possable obstructions

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  • Yamaha Master
  • 9,324 Answers

Burned intake valve, out of time, excessive carbon on the valves.... check timing first then go inside the engine for burned valves.

Posted on Dec 05, 2014

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Posted on Jan 02, 2017

SOURCE: 2001 yamaha Grizzy 600 not getting gas

Hi Daniel,
Check the ignition coils.

Knight. (yamaha seca XJ750A 1981)

Posted on Feb 12, 2009

wayneman01
  • 301 Answers

SOURCE: Carb leakes gas out overflow

It doesn't take much to hang the float valve open. The smallest speck of dirt or debris will cause the float valve to not shut the flow of gasoline off. After sitting for that length of time, the carburetor needs to be completely disassembled and cleaned. Use an automotive carburetor cleaner (but do not put any plastic or rubber parts in the carb cleaning solution as they will be eaten up). While you've got the carb apart, inspect the float valve. Replace it if there's a groove worn into the tapered seat. Installing an in-line fuel filter may help, too.

Posted on Nov 16, 2009

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Hi, Anonymous and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
7. Intermittent short circuit due to damaged wire insulation.
8. Intake air leak.
9. Water, dirt, or rust in the fuel system, fuel pump and/or filter.
10. Fuel tank vent system plugged.
11. Throttle body controls misadjusted.
12. Damaged throttle body or intake seals.
13. Loose, dirty, or corroded ignition module connector at crankcase.
14. Faulty MAP, CKP, O2, and/or CMP sensors.
15. Incorrect valve timing.
16. Weak or broken valve springs.
17. Damaged intake or exhaust valve.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have nice a day.
Hard start Backfires The FZR Forum
How to Clean Motorcycle Carburetor the RIGHT way Evan Fell Motorcycle Works
https://www.tradebit.com/filedetail.php/2864660-yamaha-fzr-600-service-repair-manual-pdf
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

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change plugs and rebuild carbs.

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Hi Daniel,
Check the ignition coils.

Knight. (yamaha seca XJ750A 1981)

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