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1987 YFM 350 ERT Yamaha Moto 4 4-wheeler backfire through carb and ex. when trying to start same- valves have been redone and set- rings have been changed carb. has been cleaned and checked unit will not start except for the backfire

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Posted on Jan 02, 2017

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SOURCE: How do I adjust the valves on my 2003 Yamaha Warrior YFM 350X?

first you need to remove everything that covers your valve covers(gas tank etc.) remove the intake valve cover,and the rotor nut and timing plug.set the engine a t.d.c.(top dead center)fit a socket onto the rotor nut and turn it counterclockwise until the"I" mark appears align it with the index mark in the timing hole.use a flat feeler gauge between the top of the valve and the adjuster.loosen the locknut and turn the adjuster just until you feel resistance on the feeler guage.hold the adjuster and tighten the lock nut down.i can not tell you the min.clearance spec to your quad since i have a 660 raptor.try using the smallest clearance number.

Posted on Apr 25, 2009

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SOURCE: my 1989 yfm 350 moto 4 starts but will not come

Recheck the float level, reblow the jets both primary and main.
Replace the spark plug and reset the air-mixture screw....2 and half turns to 3 outwards ..
after tightening it to the end take care not to over tighten ....to avoid damaging the tip of the screw.
Hope this helps!

Posted on Oct 11, 2009

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2 Answers

Head torque specs on 1987 Yamaha moto-4 350 Quad


Try this manual hope it helps,

http://www.maultechatv.com/techguides/Service%20Manuals/YAMAHA/Bruin%20350.pdf

Aug 09, 2016 | Yamaha Motorcycles

1 Answer

I have a Yamaha moto4 350 that will, at best, start and idle but dies immediately when I give it any gas. The carb is new, any idea why it won't start? Or when it does, why it dies when given gas


Hi, Kieth and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Discharged battery, 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.
8. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
10. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2 and/or BAS).
11. Security alarm needs a reset.
For more information about your issue, please visit the websites below. Good luck and have a nice day.
yamaha moto 4 350 update
No Spark Diagnosis Motorcycle 4 Wheeler Starting Issues Using Multimeter
http://www.maultechatv.com/techguides/Service%20Manuals/YAMAHA/Bruin%20350.pdf

Dec 11, 2015 | Yamaha Motorcycles

1 Answer

Yamaha moto 4 yfm 250a 1990


If there is a line coming FROM the carb, it is probably an overflow. Typically, the fuel line come FROM the tank TO the carb whre the fuel is mixed with air and burned. I am not familiar with this particular model ...

May 28, 2013 | Motorcycles

1 Answer

Yfm 350 warrior air mixture screw is


this definetly seems like your float adjustment needs checking/resetting.

Jun 16, 2012 | Yamaha Genuine Yfm 350 Yfm 600 Yfm660...

1 Answer

I have a 1998 yamaha warrior yfm 350cc 4 wheeler that was running good then all of a sudden when u give it any throttle it starts spitting and sputtering. i was told it may be out of timing. my ? is how...


I doubt that timing is the problem. Chances are the carb float bowl has filled with condensation from the gas tank. Try draining the carb. Please rate my answer. tombones49_77.gif

Apr 14, 2011 | Yamaha YZ 250 Motorcycles

1 Answer

My 1989 yfm 350 moto 4 starts but will not come off idle it backfires and carbons the plug i rebuilt the carb but the symtem did not change at all thank you


Recheck the float level, reblow the jets both primary and main.
Replace the spark plug and reset the air-mixture screw....2 and half turns to 3 outwards ..
after tightening it to the end take care not to over tighten ....to avoid damaging the tip of the screw.
Hope this helps!

Oct 11, 2009 | 2002 Yamaha Road Star Warrior

1 Answer

How do I adjust the valves on my 2003 Yamaha Warrior YFM 350X?


first you need to remove everything that covers your valve covers(gas tank etc.) remove the intake valve cover,and the rotor nut and timing plug.set the engine a t.d.c.(top dead center)fit a socket onto the rotor nut and turn it counterclockwise until the"I" mark appears align it with the index mark in the timing hole.use a flat feeler gauge between the top of the valve and the adjuster.loosen the locknut and turn the adjuster just until you feel resistance on the feeler guage.hold the adjuster and tighten the lock nut down.i can not tell you the min.clearance spec to your quad since i have a 660 raptor.try using the smallest clearance number.

Apr 24, 2009 | 2003 Yamaha YZ 250

6 Answers

Yamaha warrior atv [yfm 350] bogging problem


Try checking the switch for your parking brake. It is the top wire in the clutch handle boot. This wire connects to your CDI box, and restricts the RPM's while the parking brake is engauged. To find out for sure, trace the wire down to the plug under the headlight assembly and disconnect it. Now try starting you machine and give it some throttle!

Apr 18, 2009 | 2002 Yamaha Road Star Warrior

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