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450 stage 2 cam and hi compression piston jetting question.
Posted: Tue Apr 13, 2010 9:16 am
by Jimbo0909
just put a 12.5:1 hi comp piston in my 06 450R runnin a 185 main jet and a 48 pilot with the stock fuel mixture screw setting and needle setting and its still running lean. anyone else running this setup?
Posted: Tue Apr 13, 2010 11:09 am
by Asmith
Where is it lean?? Did you do a plug chop?
Posted: Tue Apr 13, 2010 5:42 pm
by Jimbo0909
yeah i did a plug chop and its still running lean i just got a 50 and a 52 pilot so im gonna try that and see what it does
Posted: Tue Apr 13, 2010 5:52 pm
by Asmith
Shouldn't need anything bigger than a 48 at the most...usually a 45 works great with the 450R's.
Make sure the passageway between the pilot/fuel screw and the venturi is open and clean.
Posted: Tue Apr 13, 2010 7:54 pm
by wmrice
What needle are you using? My 450x is running a stage 2 and a 13:0-1 piston and I'm only running a 172 main JD red needle and a 45 pilot and it flys with that set up
Posted: Tue Apr 13, 2010 8:11 pm
by dsrpilot
Ok, I give. What's a plug chop?
Posted: Tue Apr 13, 2010 9:03 pm
by Asmith
dsrpilot wrote:Ok, I give. What's a plug chop?
Killing the engine at a certain RPM and immediately pulling the plug to see it's condition.
Riding wide open to see what the plug looks like won't work if the bike idles back to the truck afterwards...
Posted: Wed Apr 14, 2010 4:48 am
by dsrpilot
~ wrote:dsrpilot wrote:Ok, I give. What's a plug chop?
Killing the engine at a certain RPM and immediately pulling the plug to see it's condition.
Riding wide open to see what the plug looks like won't work if the bike idles back to the truck afterwards...
Thanks. Learning something new here every day!
Gotta love it...
jetting
Posted: Sun Apr 18, 2010 12:32 pm
by Jimbo0909
put a 50 pilot and a 190 main with my needle on the 5th position now it runsd great.