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I was riding my 08 yfz 450 an it has Ben popping an backfiring an al of a sudden it died an want start back tried pulling it it started but died wouldn't stay running ??

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Posted on Jan 02, 2017

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SOURCE: my yfz 450 is backfiring on deacceleration

look for loose exhaust bolts or seals that are leaking.

Posted on Apr 05, 2010


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1 Answer

When I pull my clutch in on my yfz 450 it's not engaging it has a brand new cable and lever an a Henson racing clutch on it can anyone help me out here?

When you PULL the clutch lever in, it DISENGAGES the clutch separating the engine drive to the gears.

There are adjustments on the clutch bearing itself and then in the cable. The cable should have about an eighth to a quarter inch of free play at the lever.

Check out these three videos.

YFZ450 Clutch Mods - YouTube

alt="Video for clutch in on my yfz 450">? 6:59 Jan 18, 2010 - Uploaded by Tooextrememx How to improve your clutch responce on your YFZ450 with a few quick mods.

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Clutch gripping problem Or Adjustment LTZ400

Jan 18, 2016 | Motorcycles

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Why does my Vintage Cub Cadet 125, Kohler 12HP engine pop/backfire and die when given any throttle?

Carburetor needs adjusted. May need rebuilt or just cleaned. Could be one of the jets is plugged.

Jul 19, 2014 | Cub Cadet Garden

2 Answers

My 2004 yfz 450 wont start i changed my plug changed my stator put fresh gas in it was riding over the weekend then stopped for a break and went to start up wouldn't start

When you have difficulties starting do you get fuel to the cylinder and sparks on the plugs when you pull out the hi tension wire from the engine?

Sep 30, 2011 | 2004 Yamaha YZ 450 F

1 Answer

My 2004 yfz 450 wont start i changed plug and stator still wont start you can hear lil backfire from pipe when trying to crank

Did you tried replacing the CDi for your bike?
Tell me what happen when you replace or borrow a CDi from your friend, just to check if it is the real culprit......

Sep 30, 2011 | 2004 Yamaha YZ 450 F

1 Answer

I was riding my 03 yz450f and it back fired and just died. then i tried to start it had a hard kick and had to use hotstart to start it once started ran 2 seconds and backfried and died. then tried...

hi mate backfire usually points to lean fuel condition but in your case being quite severe maybe blocked pilot jet. I would remove carbi and compress air clean it with pilot jet out and clean or replace pilot jet they only cost a few dollars...
I would also highly recommend a leak down test to double check your valves are sealing well and compression is all within range.
any Yamaha shop can do this test for you if you don't have the equipment, may be hundred or so but could save you heaps with accurate diagnosis in case something major is wrong??
regards Jamie

Jul 24, 2011 | 2003 Yamaha YZ 450 F

1 Answer

I have a 2004 yfz 450 that i just rebuilt but it has always backfired when in neutral or when i clutch it my buddy tells me it is prolly jetted wrong what do u think i should do, i havent tried to switch...

Check sparkplug gap..
If the bike runs okay other than backfire try clean carb or take it off an get a pro to do this . It could be a very cheap fix..Worked for me..
Hope this works

Aug 22, 2010 | 2004 Yamaha YZ 450 F

2 Answers

I have a 06 yfz 450 it idles and revs clean but when i try to take off it dies,i cant give it enough gas to start to start rolling without it dieing

its starving of fule running week, it revs standing still but under load it dieys,, clean out all fule lines and taps jets or what ever,,,,also check air fillter,, and spark plugs,,

Mar 03, 2010 | Yamaha YZF-R125 Motorcycles

1 Answer

04 yfz 450 wont start with electrical start

i have a 04 yfz 450 quad. the compression ratio like yours is extremely high. ive had my battery go bad and found that another battery other than factory would turn over the engine, but would not start. i paid the 100 dollars for the factory battery and it fired right up. because of the high compression you need a high cranking battery.

May 04, 2009 | 2004 Yamaha YZ 450 F

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