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DGH needle?


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Switching to alky. Never ran it before. Set up is a 10 mil cub with 39pwk's set up for alky. +10 timing. Got the carbs from a member on here. Have a noss head with 25cc domes that Jeff at fast cut for me. Dumps are at .125 and have a bunch of jets drilled ready to try. Carbs have a DGH needle in them. Should I try and tune with these needles? Or order different ones?

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Switching to alky. Never ran it before. Set up is a 10 mil cub with 39pwk's set up for alky. +10 timing. Got the carbs from a member on here. Have a noss head with 25cc domes that Jeff at fast cut for me. Dumps are at .125 and have a bunch of jets drilled ready to try. Carbs have a DGH needle in them. Should I try and tune with these needles? Or order different ones?

 

There will be different opinions on how to set them up. We just set our 39s bored to 41s with a .120 dump, DGH needle, #60 pilot & a .101 drilled adjustable power jet. This just a baseline & have not started/tested the set-up yet.

 

My old 35s many years ago. The dumps were drilled @ .125 never did like them that big.

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I was trying to find the needle chart in sudco for you. Not having any luck, the one I'm using is a small manual I got from them.

 

According to their web site they have needles E, F & G that a richer in the 1/4 - 3/4 throttle. My manual only goes to the E needle. The chart also describes rich/lean in different throttle positions also.

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I was trying to find the needle chart in sudco for you. Not having any luck, the one I'm using is a small manual I got from them.

 

According to their web site they have needles E, F & G that a richer in the 1/4 - 3/4 throttle. My manual only goes to the E needle. The chart also describes rich/lean in different throttle positions also.

give you a hand

 

KeihinNeedleChartI.jpg

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that chart is very helpful in truly understanding the MANY ways how needles effect jetting! ive used this chart many times when finding that "perfect" needle! I also think that the needle choice of jetting is the most important but also the most over looked aspect of the tuning game! a poor needle choice will make a quad feel like a total shit turd! and as far as the dgh needle, thats the needle I run in my 10cub on gas. my setup runs extremely well from bottom to top! it never over heats and never fouls plugs!

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that chart is very helpful in truly understanding the MANY ways how needles effect jetting! ive used this chart many times when finding that "perfect" needle! I also think that the needle choice of jetting is the most important but also the most over looked aspect of the tuning game! a poor needle choice will make a quad feel like a total shit turd! and as far as the dgh needle, thats the needle I run in my 10cub on gas. my setup runs extremely well from bottom to top! it never over heats and never fouls plugs!

 

We have been running the DGH needle on race gas & it works very well. We will see how it does on alky, if it's not right we will change it.

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