Petter A1 - Firing Problems
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Petter A1 - Firing Problems
I am making some improvements to my Petter A1 before rally season. I re-ground the valves, and after a re-assembly I gave it a test run. It pops fine and dandy, but there seems to be smoke coming out of the choke hole in the carb every time it starts. Do you think I have messed the tappet clearances when I was valve-grinding? Have I not ground the inlet valve enough? Any help is much appreciated.
Cheers,
Ally
Cheers,
Ally
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You Tube channel: https://www.youtube.com/channel/UCYAohYdQQQy2TbKsIltrTKg
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1951 Petter A1, 1965 JAP model 6, 1950's Villiers mk10 compressor set, WW2 Douglas FT35, 1960's ATCO Villiers Lawnmower and Petter A2
Ally's_Engines- Born to be wild
- Posts : 39
Join date : 2014-01-12
Age : 24
Location : Brechin, Angus
Re: Petter A1 - Firing Problems
Hi Ally,
Tappet clearance should be 10 thou. Our newly acquired A1 was way out when we checked. If you have a nice matt line around valve and seat you should be fine.
I would have thought that lapping the valves would effectively lengthen the valve stem since the valves would be sitting lower in the seat. So the tappet clearance would be reduced and the inlet might open a little early. Best to check as it's an easy adjustment to make.
Tappet clearance should be 10 thou. Our newly acquired A1 was way out when we checked. If you have a nice matt line around valve and seat you should be fine.
I would have thought that lapping the valves would effectively lengthen the valve stem since the valves would be sitting lower in the seat. So the tappet clearance would be reduced and the inlet might open a little early. Best to check as it's an easy adjustment to make.
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Regards Paul
Tha can alus tell a Yorkshireman - but tha can't tell him much.
Woodsman- Admin
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Join date : 2014-08-24
Age : 72
Location : God's own county
Re: Petter A1 - Firing Problems
Hi Paul
I checked the clearance and it is at 10 thou on the dot. I'm just going to give her a long run and see if that makes any difference. Thanks for your help...
Regards,
Ally
I checked the clearance and it is at 10 thou on the dot. I'm just going to give her a long run and see if that makes any difference. Thanks for your help...
Regards,
Ally
_________________
You Tube channel: https://www.youtube.com/channel/UCYAohYdQQQy2TbKsIltrTKg
------------------------------------------------------------------------
1951 Petter A1, 1965 JAP model 6, 1950's Villiers mk10 compressor set, WW2 Douglas FT35, 1960's ATCO Villiers Lawnmower and Petter A2
Ally's_Engines- Born to be wild
- Posts : 39
Join date : 2014-01-12
Age : 24
Location : Brechin, Angus
Re: Petter A1 - Firing Problems
Hi Ally,
Can you feel it blowing from the carb on the compression stroke if you put you hand over the inlet? That might indicate that the inlet valve is not seating properly.
You could also check the gasket - maybe it's leaking across from exhaust port?
Can you feel it blowing from the carb on the compression stroke if you put you hand over the inlet? That might indicate that the inlet valve is not seating properly.
You could also check the gasket - maybe it's leaking across from exhaust port?
_________________
Regards Paul
Tha can alus tell a Yorkshireman - but tha can't tell him much.
Woodsman- Admin
- Posts : 2656
Join date : 2014-08-24
Age : 72
Location : God's own county
Re: Petter A1 - Firing Problems
I'll give that a try thanks
Ally
Ally
_________________
You Tube channel: https://www.youtube.com/channel/UCYAohYdQQQy2TbKsIltrTKg
------------------------------------------------------------------------
1951 Petter A1, 1965 JAP model 6, 1950's Villiers mk10 compressor set, WW2 Douglas FT35, 1960's ATCO Villiers Lawnmower and Petter A2
Ally's_Engines- Born to be wild
- Posts : 39
Join date : 2014-01-12
Age : 24
Location : Brechin, Angus
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