mrsprite
Jedi Warrior
Offline
So.....just how long is an SU needle supposed to last? Is this something that should be replaced every few years or is it a 'set it and forget it' sort of thing?
Here's the scoop.....got refurbished carbs 2 years ago from a very reputable shop (these are the Datsun Hitachi SU's). Everything has been great until a few weeks ago. I had several small, unrelated problems pop up including a over rich condition on the back carb. The plugs were getting very sooty at a level that used to be very lean. I pulled the carbs apart and noticed a shiny spot at the base of the needle as if it were rubbing. What would cause this to happen all of the sudden?
I just got a Colortune and tried adjusting the carbs. The rear carb still runs slightly rich with the needle all the way up (fully lean....obviously related to the rubbing). Will this cause any problems until I replace it or should I just stop driving until I fix it?
Do I need to replace the needle or can I try recentering it? There was just the slightest bit of rubbing at the idle portion of the needle (station 1?), so maybe the needle is still saveable? Also, I did try to remove the needle, but it would not budge (yes....I removed the set screw). What's the secret to getting it out without destroying it?
I plan on calling ZTherapy tomorrow, but figured someone here could help me out. Sorrry this post was so long!
Here's the scoop.....got refurbished carbs 2 years ago from a very reputable shop (these are the Datsun Hitachi SU's). Everything has been great until a few weeks ago. I had several small, unrelated problems pop up including a over rich condition on the back carb. The plugs were getting very sooty at a level that used to be very lean. I pulled the carbs apart and noticed a shiny spot at the base of the needle as if it were rubbing. What would cause this to happen all of the sudden?
I just got a Colortune and tried adjusting the carbs. The rear carb still runs slightly rich with the needle all the way up (fully lean....obviously related to the rubbing). Will this cause any problems until I replace it or should I just stop driving until I fix it?
Do I need to replace the needle or can I try recentering it? There was just the slightest bit of rubbing at the idle portion of the needle (station 1?), so maybe the needle is still saveable? Also, I did try to remove the needle, but it would not budge (yes....I removed the set screw). What's the secret to getting it out without destroying it?
I plan on calling ZTherapy tomorrow, but figured someone here could help me out. Sorrry this post was so long!