Author Topic: 400 Falta timing  (Read 510 times)

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Offline tony27

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400 Falta timing
« on: February 04, 2017, 02:22:59 PM »
I've just received a Falta head to go with my Southbay modded Falta cylinder & have come across a couple of different ignition timing figures
Some sources like the Clymer manual say all 380s/400s should be timed 3.4-3.6mm but I've also seen a spec sheet that listed the Faltas as 3.8-4.0mm
Compression on the Falta was listed as being higher than the earlier models
What sort of timing figure are people using in their Faltas?
« Last Edit: February 05, 2017, 04:27:25 PM by tony27 »

Offline tony27

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Re: 400 Falta timing
« Reply #1 on: February 05, 2017, 04:33:38 PM »
Something strange I came across today, normal B8HS sits 2 or 3 threads up but a B8ES sticks out by about the same amount. I think the easiest way around this will be to turn up a 2.5mm thick washer to run under the longer reach plug


1/2" reach plug fitted

3/4" reach plug fitted

Offline YSS

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Re: 400 Falta timing
« Reply #2 on: February 05, 2017, 05:14:43 PM »
Tony , make the spacer with a inside thread , so it can not fall off by mistake . Especially if you are in the pits or in a hurry .  I have to do the same on my 998 engines to clear the valves .
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Offline tony27

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Re: 400 Falta timing
« Reply #3 on: February 07, 2017, 07:41:13 PM »
Unfortunately now that I don't work as a toolmaker I don't have access to a 14mm spark plug tap, will just bore it to a good size over the thread

Offline tony27

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Re: 400 Falta timing
« Reply #4 on: July 01, 2017, 11:55:22 AM »
3.5mm spacer lined things up nicely

Picked up another Falta head that has the same machined recess, haven't tried a plug yet to see if the same problem exists