All 2st 2010 husqvarna wr300 PLUG fouls

[LBBKserg]

so pretty much ever since i got this bike its been a plug eating monster pretty much every ride or every other ride it eats one can't seem to figure out, Ima a fast rider and constantly clearing out the plug as i ride. I feel like I've tried everything 50:1 45:1 40:1 up and down the needle jd jet kit
anyone have any idea or tips? went through over 20 plugs at least its getting quite old.

 

[David Hudson]

Sorry to hear that. Have you checked the float level and the float needle for damage? Leaking float needle and/or seat and fuel too high in the bowl can lead to rich running and fouled plugs. Also check to see if the spark looks strong. I have read that bikes with Ducati ignition tend to have more problems than the 2009 and older bikes. I've had my 2000 WR250 for years and rarely ever foul a plug. Well, it did foul a plug once after I first moved to Spokane WA. from Florida. I recently installed a 300 kit in my bike and I'm using the newer style TMX38 with a JD Jet kit. I followed the instruction in the kit and jetted it using the recommendations for 3000'-5000' 410 main, 32.5 pilot, red needle in the 2nd grove from top, and about 2 turns out on the air screw. 40:1 Maxima 927. Seems to run great. Hope you can find what works for your bike!

 

[Dirtdame]

I have a 2011 300. I use a NGK waterproof cap and an Iridium plug in my bike. The only plug I ever fouled was a non iridium one.

 

[David Hudson]

Good advise Dirtdame. The only plug I fouled was also a non iridium one. Now I'm also using a NGK plug cap and NGK iridium plug.

 

[LBBKserg]

I'll check the float level, i only checked that it works properly.
I bought a jd jet kit and made the bike run better but fouls plugs even faster now..
I use motorex for the oil would a different brand matter?
I used just the completion ngk br8eg i tried the cheaper version it actually lasted longer
I'll look into ordering some iridium plugs. feel like it should've been such a simple problem i have never even seen anyones spark plugs foul and i spent more on plugs than it costs for a top end ha..

 

[LBBKserg]

I have a 2011 300. I use a NGK waterproof cap and an Iridium plug in my bike. The only plug I ever fouled was a non iridium one.

can u link an exact cap that you use?

 

[Dirtdame]

can u link an exact cap that you use?

https://www.ebay.com/itm/NGK-TB05EM...216310&hash=item3d59ff8201:g:FtIAAOSwvR5aEH3M

 

[LBBKserg]

https://www.ebay.com/itm/NGK-TB05EM...216310&hash=item3d59ff8201:g:FtIAAOSwvR5aEH3M

thanks will be ordering one! hopefully i can get to the bottom of this if you remember earlier i was splitting the case for my first time and put back together been running great other than spark plug fouling already at 19 hours since the rebuild. how often do you replace the piston?

always been confused on the measuring and degree to know if the float height is proper

View: https://www.youtube.com/watch?v=SkIN2XqlgVo
this is genius!

 

[Dirtdame]

thanks will be ordering one! hopefully i can get to the bottom of this if you remember earlier i was splitting the case for my first time and put back together been running great other than spark plug fouling already at 19 hours since the rebuild. how often do you replace the piston?

always been confused on the measuring and degree to know if the float height is proper

I let my piston go quite a while, about 5 seasons...really too long, but I do a lot of low speed riding. The original piston had the "death smile" on the back of it from the intake port. I use the stock Mikuni with a JD Racing jet kit in it. I also run a larger main jet than stock. The bike starts and runs good.

 

[LBBKserg]

I let my piston go quite a while, about 5 seasons...really too long, but I do a lot of low speed riding. The original piston had the "death smile" on the back of it from the intake port. I use the stock Mikuni with a JD Racing jet kit in it. I also run a larger main jet than stock. The bike starts and runs good.

ahh never heard of the death smile ha ,
i ride pretty heavy tillamook rain forest oregon and washington type of terrain so just wondering how long i should be running a piston with the riding i do,
ya i didn't realize till recently when i was going to purchase a JD jt kit that my carburetor is a pwk not stock,
i adjusted the carb float proper adjust the jd kit according to my elevation,
adjusted spark plug gap according to manual

ordered the cap and the iridium plug going,
going to ride it sometime this week and see if it fouls again it usually ends up being at the same exact point through a single track.

 

[Dirtdame]

ahh never heard of the death smile ha

That "smile" will eventually break off the piston.

 

[rockdancer]

When you say up and down the needle jet kit do you mean you've tried different needle heights ? on 2nd slot for example ?

 

[LBBKserg]

When you say up and down the needle jet kit do you mean you've tried different needle heights ? on 2nd slot for example ?

yeah, so i rode monday night for about an hour, bikes never felt better and no plug fouls for once i hope i finally figured it out after a year of ownership. iridium plug came in and waiting on the new spark boot and going to test that a

 

[LBBKserg]

That "smile" will eventually break off the piston.

what about the rings do you replace those?

 

[Dirtdame]

what about the rings do you replace those?

Of course.. they come with the new piston. I never waste my time tearing down an engine to replace just one component. I know some people replace just their rings, but by the time I tear down my top end, it's time for a complete kit with a top end bearing as well.

 

[Huskynoobee]

^^^Yes indeed! Wiseco and Vertex have complete kits except the small end bearing. They are a better value and you do the job right the first time.