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Seems a daft question but---

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Seems a daft question but---

Post by mantaboy on Wed May 09 2012, 19:29

I have almost finished putting my engine back together, a bamford 4hp open crank, and have noticed that the cranking handle can be used either way with a reversible tooth in it, question is which way should the engine be cranked, Embarassed i thought i could work it out by the valve timing but the exhaust valve is operated by a long rod from a cam by the magneto box but the inlet works off cylinder suction (don't know what the technical term is), my other question is when i spin the engine either way i can't get a spark but if i disconnect the lever assembly to the mag and work it manually i only get a spark if i work it with a quick flick action, it's as tho the engine can't flick it fast enough, has any one had this fault? i'm thinking maybe a mag rebuild?

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Re: Seems a daft question but---

Post by seniorengineers on Wed May 09 2012, 21:07

hi, with regards to the reversable handle, it will fit other engines, and some are anti clockwise rotation, hence the reversable key. As for your engine, i am almost certain it is of a clockwise rotation, but don't quote me on that! it maybe a mag problem, all i can say is get it checked out, or maybe other guys on here will know better than me. cheers david.

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Re: Seems a daft question but---

Post by billypurves on Wed May 09 2012, 21:20

What type of magneto do you have on your engine?

The inlet valve is called a atmospheric valve as it made to operate by the engine pressure.......vaccuum to open compression to close.......

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Re: Seems a daft question but---

Post by mike d on Wed May 09 2012, 21:26

seems like this is on the way to be sorted out,thanks for all the help fellers...
mike...

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Re: Seems a daft question but---

Post by billypurves on Wed May 09 2012, 21:29

If you are getting a spark when you work the mag by hand and I am assuming it is a Wico EK mag...at this point.

Sounds like the issue is with the the tripping mechanism. These can take a little time to get set up at first especially after a strip or rebuild.

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Re: Seems a daft question but---

Post by ian webb on Wed May 09 2012, 21:31

Hi, and welcome, nothing is a daft question, thats what were all here for, i would say clockwise rotation, as for the mag how fast are you having to flick it, is the arm on the engine flicking it far enough,
Ian

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Re: Seems a daft question but---

Post by mantaboy on Thu May 10 2012, 06:55

Thanks for the info guys, i will have a go at setting the tripping mechanism at the weekend. "atmospheric valve", thanks. I will find out the make of the magneto and get back to you, cheers

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Re: Seems a daft question but---

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