PWK vacuum take off for tank tap.
Moderator: rztom
Re: PWK vacuum take off for tank tap.
It IS possible (practical even) to fit a T to one of the oil fittings and use the resulting 'extra' connection for a Vac connection.
Yesss It's been done before and Yess it works 'fine'.
Yesss It's been done before and Yess it works 'fine'.
Re: PWK vacuum take off for tank tap.
T in your oil line for vacuum??????
tuned to Paris Hilton specs............rich and retarded!
Re: PWK vacuum take off for tank tap.
Was it mistyped!
Buy a cheap plastic T fitting (windshield washer type will do) .
Simply insert it into the oil feed line close to the carb.
2 mins later and you will know if it works.. Or not
Buy a cheap plastic T fitting (windshield washer type will do) .
Simply insert it into the oil feed line close to the carb.
2 mins later and you will know if it works.. Or not
Re: PWK vacuum take off for tank tap.
It works, Ive done it before too.
80 XT500 Supermoto!
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid
Like Watches? www.PloProf.com & www.DeskDivers.com
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid
Like Watches? www.PloProf.com & www.DeskDivers.com
Re: PWK vacuum take off for tank tap.
Thanks for the reply bare but wont risk a new build engine worth nearly 3k thanks. Hence why i asked if anyone has drilled a pwk in that spot for vacuum.
One also has to wonder why Yamaha didnt use this method either?
Have emailed Keihin for a def answer.
One also has to wonder why Yamaha didnt use this method either?
Have emailed Keihin for a def answer.
Re: PWK vacuum take off for tank tap.
What about. Small barb in the reed cage area? We did that for karts
Re: PWK vacuum take off for tank tap.
This is where I put it on both my 350's, One is running PWK28s and the other is running 34mm flatslides, Works perfect.
I used to run a T off the oil line with the 34,s, I swapped it over, made me fell better.. :)
I used to run a T off the oil line with the 34,s, I swapped it over, made me fell better.. :)
1985 RZv500
1984 RZ500 Hybrid
1986 RG500 Walter Wolf
1986 RG500 Skoal Bandit
1984 RZ350
1984 RZ350 Hybrid
1981 RD350LC
1981 RD350LC Hybrid
2009 CR500AF Supermoto 250X
2007 CR500AF 250X
1988 YSR50 (2)
1984 GPZ750 Turbo
1989 VFR750R RC30
1984 RZ500 Hybrid
1986 RG500 Walter Wolf
1986 RG500 Skoal Bandit
1984 RZ350
1984 RZ350 Hybrid
1981 RD350LC
1981 RD350LC Hybrid
2009 CR500AF Supermoto 250X
2007 CR500AF 250X
1988 YSR50 (2)
1984 GPZ750 Turbo
1989 VFR750R RC30
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Re: PWK vacuum take off for tank tap.
Is there not a mod where you can turn the tap into a "on-off" manual tap and do away with the vacuum port?
I'm sure I've seen it on one of the forums.
I'm sure I've seen it on one of the forums.
Re: PWK vacuum take off for tank tap.
yes there was a post on it here somewhere, you mod the rubber or plastic bit in the tap to bridge the holes.
80 XT500 Supermoto!
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid
Like Watches? www.PloProf.com & www.DeskDivers.com
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid
Like Watches? www.PloProf.com & www.DeskDivers.com
Re: PWK vacuum take off for tank tap.
I did the exact same as tacky1. It is so easy to just drill a hole in the cross over tube and tap a brass npt/barb in. Not even worth messing with the petcock. Ten minute job at best
85 Y/B, Toomey pipes, PWK 28's, JJH Needle #2, 45 pilot jet, 145 main, Pods, VForce 4 reed blocks, +3 ignition, Milled head 1.1mm squish, R6 Shock, Progressive
Many Vintage MX Bikes, 03 ZRX1200R, 86 Moto Guzzi 1000 Le Mans MK IV, 86 VFR 750, 74 GT 550
Many Vintage MX Bikes, 03 ZRX1200R, 86 Moto Guzzi 1000 Le Mans MK IV, 86 VFR 750, 74 GT 550
Re: PWK vacuum take off for tank tap.
Silly answer being : if you can't sus it out.. you don't get to ride
Re: PWK vacuum take off for tank tap.
Well i sorted it out,been for a ride & works fine,simple fix really. Pics soon.
Re: PWK vacuum take off for tank tap.
This mod isn't for everyone,i mainly wanted to retain stock look as much as possible including hoses etc.
So...here we go drilling into brand new 28mm pwk's.
Start with a 3mm drill bit & drill through this spigot/nipple to the intake tube.
Then take a 4mm x .7 plug tap & tap this hole approx 5mm in,drilling through for the vacuum cross drills into this circuit. Its not used as it is an optional bowl vent. There are 2 vent holes & the other side is used so all good.
Then take your 4mm grub screw that has a slight coating of fuel proof thread lock & tighten into place.
Ultrasonic clean carb & blow it out to clear any chips etc from drilling & tapping & you're done. Make sure your thread locker is fuel proof.
Oh,then ride & enjoy.
So...here we go drilling into brand new 28mm pwk's.
Start with a 3mm drill bit & drill through this spigot/nipple to the intake tube.
Then take a 4mm x .7 plug tap & tap this hole approx 5mm in,drilling through for the vacuum cross drills into this circuit. Its not used as it is an optional bowl vent. There are 2 vent holes & the other side is used so all good.
Then take your 4mm grub screw that has a slight coating of fuel proof thread lock & tighten into place.
Ultrasonic clean carb & blow it out to clear any chips etc from drilling & tapping & you're done. Make sure your thread locker is fuel proof.
Oh,then ride & enjoy.
Re: PWK vacuum take off for tank tap.
Great work mate!
80 XT500 Supermoto!
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid
Like Watches? www.PloProf.com & www.DeskDivers.com
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid
Like Watches? www.PloProf.com & www.DeskDivers.com