Backfires on acceleration

SOURCE: 2005 yamaha yzf 250-unstable idle

I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.

SOURCE: have problems starting yamaha xvs 1100 dragstar

Hi there fellow XVS dragstar owner!

I had the same problem before. It is usually caused by the wrong jets installed. have it Replaced with the standard jets that came with it... this will solve the problem on acceleration. Make sure the fuel and air mixture knob is set to 2.5 turns-out from full close. clean the spark plugs.. better, replace it with a new one to ensure clean burning of fuel. also, use unleaded gas. this burns better.

hope this helps
-levibit-

SOURCE: engine idles fine, stalls soon as its given gas

Hi there!

Open up the carb and clean the jets with pressurized air. I also suspect water on the carburetor reservoir, before opening the carb, drain it first then run. Also, make sure the plugs are clean. Pull on the choke when twisting the accelerator, if it accelerates well, then warm the beast at normal temperature first before twisting the throttle hard again.

hope this helps-
levibit-

SOURCE: vstar 650 loosing power and missing during acceleration

check your coils and wires to them had same proplem and found 1 of the grey wires to the coil was disconnected

Murtaza Akberali Versi

• 767 Answers
• Posted on Oct 11, 2009

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!

Testimonial: "thanks for the help"