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Old 08 December 2013, 19:48   #11
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Originally Posted by Dav9790 View Post
Just to let you know the old merc 25's with that know that pulled out and turned actually adjusted the timing to give the engine more rpm and was only used for starting from cold.
I stand corrected-thanks
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Old 09 December 2013, 02:36   #12
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Might be a starting point, check engine model matches first.
Thank you. That was indeed my starting point - it just took a bit of time to find one of the right size and that was going begging.
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Old 09 December 2013, 07:37   #13
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Thank you. That was indeed my starting point - it just took a bit of time to find one of the right size and that was going begging.
What I meant was check the model number matched on the manual that I posted then you could get an idea as to prop pitch etc against the chart.
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Old 09 December 2013, 08:15   #14
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Idle speed wonlt change as it;s still just turning the vertical shaft, not the pro[p.

What you might find is when you try to open the throttle it stalls. This is becauss rhe idle mix is too lean to provide enough grunt until the main jet starts doing anything useful.

Easiest bypoass for ta test - blip the cholke as you open the throtlle. That gives you a wee bit more fuel when you need it. If you then stick with that prop, can adjust the idle mix to suit
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Old 11 December 2013, 06:01   #15
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with those obms, it is better to run slightly to rich than slightly to lean.Dont forget tickover is usually at a certain timming and revs, also with W.O.T. (wide open throttle) also the propeller is the govener for the engine, to highrevs at W.O.t.is just as damaging as to few ie having a to bigger pitch propeller so that the engine wont reach its proper rev range,good luck and a merry christmas and a happy new year people.
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Old 11 December 2013, 11:55   #16
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A cunning plan it may have been but the prop doesn't fit - it fits the splines but the hub doesn't touch the thrust washer and there is about 15mm of unthreaded shaft at the other end. Buy cheap, buy twice!

(I think a proper one will be on my Christmas list )
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