Question about 2004 Yamaha WR 450 F
Posted by Anonymous on
Hi, Anonymous popping or backfiring on deceleration is usually caused by a lean fuel condition or an air leak in the exhaust system and is generally located where black carbon soot is seen as a flashing build up from any joint connection. This condition can easily be remedied by removing and cleaning both joint pieces and reassembling with high temp silicone and torquing the exhaust clamp to the proper spec. Coughing is usually caused by an air leak in the intake system and will generally have the same telltale signs, a wet or damp buildup of oil/gas seepage at the intake manifold to cylinder head or carburetor to intake manifold connection and in rare instances a worn throttle plate shaft and or seals. Spitting is usually caused by a faulty accelerator pump and or nozzle, or the float bowl needle and seat leaking and overflowing through the main jet mixing well nozzle, or the air-fuel mixture screw is adjusted too lean. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
2004 wr450 with bad backfiring issues Page 2 WR 400 426 450
Popping on deceleration
YAMAHA WR450F Owner Service Manual
OEM parts for Yamaha
YAMAHA WR450F Owner Manual
Posted on Oct 24, 2016
A 6ya expert can help you resolve that issue over the phone in a minute or two.
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Posted on Jan 02, 2017
I have never needed to replace that part so my best help is to put a service manual in your hands.
Go to this site and you can download a free PDF service manual.
www.carlsalter.com/motorcycle-manuals.asp Most of the manuals are in English but some are not. There is no way to be sure without doing the download. You can always delete it if in a foreign language. The spring is the same '03 and '04.
Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx
A “very helpful” rating for this answer? Thanks!
Posted on Jun 20, 2009
try for a spark take plug out and put against the cylinder and see if you can see a spark when you kick it over get back to me
Posted on Sep 26, 2009
SOURCE: what jet kit should i
JD jet kits give you a few options
I ended up using The red needle at 5 notches down
up from 165 to 170 main.
up from 45 pilot to 48 pilot
You might just want to try a 170main first and see how it goes
Posted on Sep 12, 2010
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