[Roadsters] Still stumped

[MH]

Tim,
You mentioned in  your original post about this problem, that you had 
installed newly rebuilt Z-Therapy carbs. I've heard that at one time there 
were problems with their carbs if they installed Grose-Jet fuel float valves 
(on Datsun Roadsters, anyway). Apparently, they can and have caused the very 
symptoms you describe, due to some kind of vibration problem. I have not 
ever used Z-Therapy carbs or Grose-Jet valves, but I thought I'd pass this 
on. It  might be worth checking out. The Grose-Jet valve uses a ball, looks 
like a stainless steel BB. You'll know right away if you check it. More info 
about this issue is found on the 311s.org and has been discussed on the 311s 
forum.
Mike Hudson  '67 - Stroker / 5-Speed


----- Original Message ----- 
From: "Tim" <tputland at charter.net>
To: "datsun-roadsters: autox.team.net" <datsun-roadsters at autox.team.net>
Sent: Thursday, July 08, 2010 11:00 AM
Subject: [Roadsters] Still stumped


> When I last ran my Roadster, it was still not running right. I had set the 
> timing,
> re- balanced the carbs, and fixed the fuel mixture**. After this, it 
> seemed to be running well pulling strong through all the gears with no 
> ping or misses. Then, at about 75 or 80 mph, it started to do the 
> hesitation/miss thing again it was doing last week (when I was about half 
> way home from MidOhio -- I posted about this as you might remember). Based 
> on what I had read, I figured it was running lean so I pulled off the road 
> (a few times--this was last Sunday) and each during each stop slowly 
> adjusted the knobs and ended up just under a quarter turn to richen the 
> mixture. After the first and subsequent stops, it was again 
> spitting/bucking/running rough; too rich now I assume. I went home, re-set 
> the fuel mixture back to where it was above**. I was still not able to get 
> the spitting and bucking to stop.
>
> At this point it was getting too hot for me, both under the hood, in my 
> head, as well as outside so I parked the car. This is where I am at and 
> have not looked at the car since last Sunday.
>
> When I had checked/"fixed" the timing last week while in Indiana, I do not 
> think I had done it right: The timing light I was lent was of the fancy 
> variety with a setting knob that I must have not used correctly. When I 
> used my light at home, the timing was up over 30 degrees of advance. I am 
> now set at 16 degrees on a de-smogged 70 1600 running a GB EI dizzy.
>
> Any thoughts please.
>
> Thanks
>
> tim