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Hi everyone,
As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.
When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.
Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.
Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.
Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.
Thanks for your patience and support!
250-500cc Wr250 300 kit 2009
- Thread starter QUATTRO
- Start date
lankydoug
Husqvarna
Pro Class
The pilot only is involved from idle to about 1/8 throttle however the air screw works all the way through the needle circuit. If the pilot is too small you have to turn the air screw in and lower the slide to keep it from idling lean. If the pilot is too big often times the slide must be raised so high that it is partly idling on the needle and the air screw is backed out beyond 2 1/2 turns. From my experience when the pilot is the correct size on a Mikuni the air screw will end up being between 1 and 1 1/2 turns out.
At full trottle i think the fuel wil also flow true the pilot jet or am i wrong. Maybe less as at iddle but large or small pilot jet will effect the air fuel ratio at full trottle a little i think.
Also i was thibking about the short pro circuit muffler maybe this has effect also on the air fuel ratio.
I will do two test with the larger pilot jet and after the long muffler of this effects the fuel air ratio.
lankydoug
Husqvarna
Pro Class
Technically the pilot is still involved but once the slide is raised past about 1/8 there is very little siphon affect and almost all the fuel is drawn through the main and around the needle until the needle is high enough that the main is flowing all it can flow. I've had different pipes and silencers on my wr and the changes required very little adjustment (usually one size on the main and maybe 1/4 turn of the air screw). The main sizes you are using would have fouled out my spark plug in a few minutes, that's why I think you might have a float needle valve restricting the flow into the bowl so no matter what size main you put in it it has little to no effect. That or you have an air leak that is letting air bypass the carb.
I also have new float needle etc installed for a few monts ago. Also did the testvyesterday with the fuel hahn open but the fuel comes realy fast out of it the floating musst be ok. Ive seen some people in usa riding main 470 480 with the 300cc engine maybe i need a little more here in holland.
Its nowrre lower sealevel then were i live.
Also have the checked on airleaks aswell.
lankydoug
Husqvarna
Pro Class
You have to give the engine what it wants and not go off of what others have for jetting, I am worried because the pic of the snow white plug in your earlier post looks very lean.