[Healeys] Carb Adjustment Help Requested - BJ8 MkIII

David Porter frogeye at porterscustom.com
Sun Aug 13 17:20:05 MDT 2017

what are the compression numbers? Timing is set at 750RPM and 6 degrees 
BTDC. Is it better or worse with chokes engaged? DP

On 8/13/2017 3:23 PM, Bob England wrote:
> I've had a rough idle in the car since we picked it up in May and it seems
> to have gotten worse ever so slightly since then.
> I've putzed around trying the easy stuff and finally got the bullet and
> pulled the carbs yesterday (that was fun!) as one of the carb pistons was
> sticking ever so slightly.  Stripped the carbs except for the throttle shaft
> and found the floats were set a bit low.  Put it all back together and still
> having an issue as she is running quite rich, hence the call for help.
> Car: late '64 build BJ8 MkIII
> Carbs : HD8 (I think they were new about 15 years ago - not original to
> car).
> Cam : Dennis Welch DWR-1 (installed about 15 years ago).
> Distributor : stock with Petronix Ignitor (Petronix installed last weekend
> in the hopes it would help).  New rotor.
> Coil : Lucas Sportcoil
> Plugs : new Autolite gapped at 25 (installed a couple of weekends ago)
> Timing : 15 degrees with strobe (my attempt at static timing was a dismal
> failure!).
> I set the carbs as per the manual - 3.5 turns open on the idle trim screws
> and 2.5 turn rich on the jet adjusting screw.  Fast idle adjusting screw
> completely off of the cam lobe.
> The best I can get it is with the jets totally lean (i.e. not sitting on the
> cam lobe) and the fast idle screws setting the idle speed.  Idle trim screws
> backed way out with little impact on idle.  Carbs are still running rich.
> I think I have memorized the adjustment procedure from the manuals I read
> them so many time - (Bentley, BMC, and Haynes), and Norman Nock's wonderful
> collection of papers.
> Should I be going to a leaner needle in the carbs?  Or am I just screwing up
> somewhere?  This is my first attempt at adjusting SU's and I'm not too happy
> with what I have done so far.
> Any and all suggestions appreciated (except maybe if I have to yank the
> carbs again).
> Thanks in advance.
> Bob England
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Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM 
87107 505-352-1378 Go HERE: my world www.porterbikes.com/

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