bansheeqc Posted May 17, 2009 Report Posted May 17, 2009 A friend of mine have a set of 39PWk carb and he want to convert them on alky. I looked at the carb and it s look like pumper carb, probably came from a sled. It s for a drag port 4 mill stock cylinder 200 feet of elevation I never convert carb, mine are converted when i buy them I have few questions. i read on this topic http://www.bansheehq.com/forums/index.php?...259&hl=alky if i use 55 pilot, drill dump tube 0,120, drill main 0,120. use EGN or EGQ needle, 3,8 or 3,9 seat but i dont know if i am able to swith seat or a pumper to gravity ... How to buy power jet, how to and where to install this on the carb for best result. thank you Quote
J-Madd Posted May 17, 2009 Report Posted May 17, 2009 Sounds like you got it covered. JUst look at your already converted alky carb for powerjet placement. Pretty much anywhere along the body of the carb just past the air filter. F.A.S.T. has powerjets,or you can get some higher flowing pjs from Dave Moore Racing. Quote
bansheeqc Posted May 17, 2009 Author Report Posted May 17, 2009 Thank you J-Madd But, pumper carb can be switched to gravity or not? Quote
dajogejr Posted May 18, 2009 Report Posted May 18, 2009 No. The needle and seat are not removable. Post up pictures of the carb fuel inlet line, I can tell you if they're pumpers or not. Just tap the intake side of one cylinder after the reed cages and get a pump. We use the Mikuni DF62 fuel pump for methanol. Single fuel inlet, dual fuel outlet, 65L per hour. All you'll need. Quote
bansheeqc Posted May 18, 2009 Author Report Posted May 18, 2009 This carb came from a snowmobile. On the snowmobile, they run with a pump. With a pump, i don't need billet bowl right? Quote
bansheeqc Posted May 18, 2009 Author Report Posted May 18, 2009 another question. need or not pingle dual fuel petcock or the stock one is fine with a pump Quote
dajogejr Posted May 18, 2009 Report Posted May 18, 2009 How far are you running, 300, 500, 660, 1/4 mile? Quote
J-Madd Posted May 19, 2009 Report Posted May 19, 2009 400 feet I'd think you'd be fine with a stock petcock, gutted gas cap, and stock bowls with a pump. That pump will suck a half liter purge bottle dry and nearly collapse it fairly quick. Dave has more experience with a pump, but I think he'll agree. Quote
dajogejr Posted May 20, 2009 Report Posted May 20, 2009 Stock fuel valve, gutted cap, drill the vent tube out to 1/8, and a DF62 Mikuni pulse pump (65L per hour) and you'll be fine for 400 foot. No billet bowls needed. Quote
bansheeqc Posted May 20, 2009 Author Report Posted May 20, 2009 Thank you for all the information !!! bansheeqc Quote
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