Ken,
Sounds like you're running
1. lean, very lean or
2. there is a blockage in your fuel system that doesn't flow enough or
3. your float level changed.
Try pulling out the choke and see if that helps.
Mike
----- Original Message -----
From: "Ken Pearce" <ken__pearce@hotmail.com>
To: <datsun-roadsters@autox.team.net>
Sent: Sunday, April 21, 2002 12:44 AM
Subject: Tuning question, God I hope it's a tuning question!!!
> OK,
>
> After another 12 hour day getting my 68-2000 back together (I thought head
> gaskets were only an 8 hour job), I have what I hope is a tuning question.
> The new head gasket (kopper koated) went on nicely, everything squeaky
> clean... I even got to manufacture two head-bolt washers, the ones with
the
> funny shape since I had two that were cracked. What a good workout hand
> filing can be!
>
> I turn the key and vrrooooom! She starts right up (after I of course
> cranked her over a while without the coil wire so the oil could
circulate).
> HOWEVER! The engine has no power, and backfires (out the intake manifold
> little hole and carbs, NOT the exhaust).
>
> Since I shimmed my upper tensioner, I figured the timing might need
> adjusting. It was off about 7 degrees so I reset it to 17 deg. I have a
> pre-smog distributor. It ran better, but still no power and the annoying
> backfiring out the carbs/intake manifold.
>
> Soooooooo... There was a 1% chance that my timing chain slipped one tooth
> on the lower gear, even though I was careful not to let this happen. When
I
> was tightening the cam sprocket, I heard a little noise that was either
the
> lower tensioner or the chain slipping a notch. So I put the crank pulley
on
> TDC and checked my distributor rotor and my cam lobes. All looks just as
it
> should. #1 cam lobes at 10 and 2, hole in the cam sprocket pointing at
> 12noon, and #4 cam lobes at roughly 4 and 8. Distributor rotor right at
#1.
> Driver's side of the timing chain is tight, tensioner side is too since
> I've shimmed it.
>
> One thing I did not do was re-adjust my carbs. I figured they were close
> enough and hadn't touched them...
>
> QUESTION: Can poor carb adjustment alone account for the "no power" and
> backfiring I'm experiencing? My plan is to do the carb tuning routine in
> the morning and cross my fingers.
>
> Any ideas? Advice?
>
> Thanks in advance,
>
> Ken Pearce 68-2000
> Bellingham, WA
>
>
>
>
>
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