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Don Kruse



Joined: 16 May 2007
Posts: 437
Location: Albuquerque

PostPosted: Tue Jan 26, 2010 9:21 pm    Post subject: Pop Off Reply with quote

I think the WB3A needs 10lbs.. Less and you narrow the tune of the carb and more and you loose it's ability to feed fuel.

DK
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karter43



Joined: 04 May 2007
Posts: 265

PostPosted: Thu Jan 28, 2010 10:12 am    Post subject: Reply with quote

OK Don, I'll jump in on this one too ......

Yamaha pipe 8 psi

Yamaha box or super box 10 psi

I always set the fulcrum heigth at the center od my gauge with gasket, but, I don't remember what that value was Embarassed
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Stephen Spiak
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Don Kruse



Joined: 16 May 2007
Posts: 437
Location: Albuquerque

PostPosted: Thu Jan 28, 2010 7:23 pm    Post subject: Reply with quote

.045 to .050

I tried the lower setting for the pipe and found the adjustments to be more sensitive. With 10 to 11lb. it seemed easier to tune by the seat of the pants on the track.

Let me describe carb setting while on the track as described by the honorable George Clausen on this forum years ago.

Set High at 1/8
Start low at 3/4
Hit the track at 1 1/4
Start the race at 1 1/2
Open 1/4 every 3 laps to max of 2 1/4
Go back to 1 1/2 for cautions
Repeat 1/4 openings
Stall motor by closing low

I use this procedure for pipe and can classes. When your carb is in good tune with fresh pumper the plug will burn very light with a small tan line about half way down the insulator.

Oh by the way; the rubber pumper need to be replaced every three races max. I have been using the tan phenolics lately and they seem to work just as well and last longer.

DK
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Pat Barr



Joined: 06 May 2007
Posts: 82
Location: Alb, NM

PostPosted: Wed Feb 03, 2010 9:11 pm    Post subject: Reply with quote

I was usally very carefull with this one. I would very carefully remove the entire carb and ups it to George Clausen. Then I would call Jim Ruybal or Lee. I bought all the gauges but it was lots easier to watch.
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ASK123



Joined: 08 May 2007
Posts: 399
Location: ALBUQUERQUE NEW MEXICO

PostPosted: Thu Feb 04, 2010 3:15 pm    Post subject: Reply with quote

Pat, I was always careful also on any repairs or freshening of my engines and carbs. I made sure all honing and milling machines were plugged into grounded outlets and that the work bench had proper lighting with all tools readily available.

Then I would stand at a safe distance and watch Spiak do his magic. Rolling Eyes

Steve, Only you do the voodoo, that you do so well. Shocked

Typical cost of a mid season engine freshen:
piston, ring, carb kit, Dions Pizza=$72

Finishing a Main, priceless!
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Dennis Sedlak
Jonbq17@comcast.net
505-255-6789
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Pat Barr



Joined: 06 May 2007
Posts: 82
Location: Alb, NM

PostPosted: Mon Feb 08, 2010 11:58 pm    Post subject: Reply with quote

with steve that 12 bucks for parts and seventy two for pizza Laughing Laughing
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