Questions & Answers for: Yamaha WR 450 F compression

...is when the quad is cold the rings expand tight into the cylinder walls allowing it to get full compression and run ok. When it heats up they shrink allowing the slightest amount of give which in ...

...Raptor 80 will not start has good spark,gas, turns over real fast but will not start at all Get a compression tester to see if she has plenty of compression or take spark plug out ,put your finger ...

WR 450F 2007engine oil and some compression coming out of engine breather to air filter compartment. engine has compression, decompressor engine turns over the same with the decompressor Engine oil ...

Im havin the same prod with my bike 08 wr450f Looks like im gonna have to put it in the shop. YOUR COMPRESSION RINGS ARE WORN OUT AND NEED REPLACING OR YOUR PSSTON HAS MELTED DOWN THE SIDE 2009 wr450

The compression and rebound damping adjusters(top ... The compression and rebound damping adjusters(top and bottom of the fork) are not marked. Which is comp and which is rebound? Rebound at the top ...

...Remove the plug and reconnect the coil pack to see if it has a good bright spark. If yes, do a compression test. If you are at least over 100 psi,see that your carb is clean, and not gummed up ...

No compression, decompression jammed The bike was being start without using the decompresion lever. The bike would kick over with great difficulty because it would sometimes have that much copression ...

why has my wr450 lost compression alll of a sudden and my de compression lever jammed and will not extend when squeezed Something in the decompression mechanism is obviously broken or jammed and you ...

Hi I'm wondering if u can help diagnose what's going on with my Yamaha wr 450 2007 model. It was running fine last time I rode it. It's been sitting for three weeks and when I tried to start it today ...