best carbs for 10mil cub

[supersider]

39 pwk gravity fed carbs with billet bowls get my vote.

whats the deal with gravity fed?

[BigRed350x]

With billet bowls on a 10mil you don't need the pump. One less part to fail and worry about. Also one less place for a possible air leak (vacuum port on cylinders for pump signal line). I wouldn't run a pump until you get into a huge motor that guzzled fuel. If you have a pingle and billet bowls it will be adequate for most 10mil setups.

 

I ran a pingle and billet bowls on 38mm mikuni's on meth on a 10mil 612cc big block twister and do some pretty long runs (up the face of sand mountain, UT) without any problems.

[dave5.0]

I've got 3 39pwks that I'm pretty sure are pumpers. If somebody is in the market to buy some.

[supersider]

I've got 3 39pwks that I'm pretty sure are pumpers. If somebody is in the market to buy some.

how much? can i get some pics?

[sheefreak]

I got a second set of pumpers im gonna set up for backups you can throw on again and try when the time comes damian

 

I appreciate that Jeffro!

[Pedro]

where can i buy drill bits as small as .118, .120.. etc??

[dajogejr]

I've had better luck with my Lectrons (41.3 done by Packard) then I did the first two seasons running on pumper 39PWKs.

I didn't pay for my carbs, they were given to me...so cost wasn't an issue.

Are they worth twice the price of Keihins? Good question...most will say no.

 

I might just be lucky...but I love mine. blewbyu has made a pass or 5 on my bike and it is usually pretty crisp and right on the money.

 

Sheefreak's bike was pig fat rich over the summer at a local track, a turn and a half of the needle and he made a couple passes and it was MUCH better.

 

If you go with Lectrons, throw whatever you know about conventional carbs out the window...

 

I just find them easier to tune. I like not having to pull the bowl off to change jets, etc.

 

On my 10 mil cub I just leave it a little fat and run it....

If you don't have the right needle, forgetaboutit!!

 

Dan Hull builds some of the fastest bikes in the world and he swears by PWKs.

 

Look up drill index sets for the drills you need. Get a digital micrometer (harbor freight is fine...unless you're a machinist by trade, in which case you wouldn't be asking to begin with...lol)

Don't get too worried about it...

 

My advice for alky on PWKs is start with .122 dumps and mains, power jet wide open and take away the fuel as needed. Get a .118 and .120 set of mains as a backup.