robert0762

So you get to ride on the street huh? Bet thats hell on the gas pump. Wish we could make em street legal here. I would love to rip a banshee around the streets legaly.

I came out significantly less then a new set of 39 's . Had fun doing it and hopefully help some other's out as well

I tried to sell mine no one would buy them sooooo......

If you look at the pics of the gravity seat vs. the pump seat you will see a groove cut around the outside and two holes drilled through it. The pump seats do not have this. There is no way to get the seat out and modify it without trashing it. So just drilling a hole and counter sinking it will not work. That would be "ghetto-rigging" it. Pumper seat on the right Gravity seats

I dont want to tap a hole in the side of my cylinders to run a pump I do not need. If I was gonna run alky and need a pump then thats a different story.

So here are some pics First is the air vent restrictor on 39 PWK manufactured as pumpers . I drilled it out a little bit then popped it out with a pick. There are two but I only took a picture of one restrictor still in the carb. This is just another angle of the same thing Here it is with the restrictor out. Fuel inlet on exterior. Fuel inlet interior 35 PWK manufactured as gravity feed. Fuel inlet exterior Fuel inlet interior The next two pics are showing the exterior casting of a PWK 35 gravity feed PWK 39 Pumper exterior Top left is pumper inlet. Top right gravity inlet. Bottom left Gravity seat. Bottom right pumper seat Left is gravity needle. Right is pumper needle

Press in . I just grabbed them with vuse grips n twist out then tap em back in

X2. More stuff to go wrong

ttt

Mattoon Nuetral switch cover

Castings are the same except for some extra material on the pumpers to allow for drilling and tapping. The sno mo pumpers usually come with pulse pickups for a pump, oil feed, some have power jets and so on. I did a side by side comparison of a PWK 38 manufactured as a gravity feed next to a PWK 39 manufactured as a pumper . The inlets were the same size. The brass fitting was different but I just replaced the 90 deg. fitting on the pumper with a straight fitting from a gravity feed. I will post some pics up of them later today

I have heard of people running the pumper carbs on a gravity setup without any changes.I am not gonna try it on this motor I am building right now nor would I recommend it for any motor. I have not done research on the Mikuni carbs ,but I think there seats are readily available from them and a replaceable item But they are set up differently for a reason. Also if you have a big motor or even just a 350 drag port and do a long full throttle run those small seats will NOT flow enough fuel. We hear of people sucking bowls dry all the time on a properly setup gravity feed . That's why guys run oversize bowls.

25 a peice

I have been chasing down a way to do this for a couple of months now . A lot of people say you can not do it . The reason they say you can not do it is because Keihin does not make the float valve seat replaceable . I have found two sources for these seats . I came across a set of Polaris xc 700 carbs for really cheap . 39 pwk . At the time I did not know that the seats were so hard to find . Also you will need to pop the air restrictors out of the vent holes . Very easy to do with a small pick . my carbs had oil feeds on the intake side .So I drilled them out and tapped those holes to m5x.8 . I put a socket head screw in and made it even iside the carb bore to avoid turbulence . Last thing to do is pull the old seat out . To get the seat out you tap the needle seat in the small hole then run the matching size bolt in . When the bolt bottoms out it will push the seat right out . Then you just press in the new seats and your done . You will also need the needle valve itself. I will post pics tomorrow of the install Here are the seats I purchased from Benn Herr @ Kart designs . He can cut the seats to any size you want . I went with a 3.8 which is the largest size for the pwk . HPD inc also makes them but his are 3.5 mm. keihin makes them in 3.4 and 3.8 my 35 pwk had a 3.4 and the 38 pwk had a 3.8 in it

Bump Sent from my SCH-I535 using Tapatalk 2

Ttt

Had to have additional trenching done. Kevin does his trenching like that

Still waiting on idler gear, timing plate, clutch, cylinders, head,

Did some assembly today. Stainless alloy boltz kit Seals greased Cases ready to go together Going together All torqued down Sprocket and shiftter seals in Primary drive gear sealed up Torqueing primary drive gear New eccentric screw and spring. Centered perfectly Clutch pusher installed

Just got done ordering all the small stuff I needed to start getting this motor put together. Also just ordered the cylinders from mr bling motorsports. Cant wait to see them they're gonna be sexy .

I converted them to gravity feed and I'm gonna run em on my new build

Looking for the newer style dd cover

http://www.farmandsandtoys.com/partdetail.asp?partid=468 125 brand new from jeff

Some more pics.