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Old 19 April 2005, 13:08   #1
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Country: UK - England
Town: bicester, Oxford
Boat name: mach1
Make: avon SR5.4
Length: 5m +
Engine: 90hp yamaha
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Use Of Choke On Yam 50hp 2 Stroke

Hi

i never seem to start my engine 1st time in both winter & summer months. I always flick the choke switch and hold for 1 maybe 2 seconds then turn the engine over raising the idle throttle up and down.

i am worried im not useing the choke enoth or too much? am i supposed to leave the idle throttle lever in a fixed position or feather it the way i have been.

When hot it starts like a dream and runs perfect, i have changed plugs recently aswell.

please help
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Old 19 April 2005, 13:26   #2
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Country: UK - England
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Thats an older 2 stroke for you ... sounds normal.

Increase the idle.
Turn the key ... if it does not start after a few revolutions then:
Push choke as you turn the key. When it fires let the choke go, but if the engine sounds like its going to die push the choke again for a blip to cause the engine to recover. Let go again, repeat if required.
Leave to warm up
Lower idle

Thats what I have done all these years. Key thing is not to over choke. If you do you will flood it. Leave choke off and idle down then turn over a few times and try to start. Hoefully this will burn off excess fuel and maybe even start!
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Old 19 April 2005, 15:48   #3
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Country: Belgium
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Same with my yams and years of bitter experience - do the following.

If the engine is cold , and not used for about 5 hours- Use full choke - until engine fires- then reduce by half until it sounds constipated ( about 10 seconds - then graduallly reduce choke to zero ( idle).
The name of the game with 2ts is to advoid wetting the plugs- and that is art
in itself. Every 2t is different ( it seems) - you just have to find out for yourself the routine that fits your engine.Basicaly - I would prefer to use 30% choke and 2/3 rds throttle when starting - but you cant do it.

Good luck
Jonathan
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Old 19 April 2005, 16:48   #4
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If only they were 'standard'. My merc likes no thrrottle and full choke until it runs then blip the choke before it stalls. It seems the electric choke that can only be on or off is the cause of most problems.

Tim'mers
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Old 19 April 2005, 20:46   #5
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My Yam cv85 2T is the same...

always have to start on full choke, then I immediately take choke off to half and give it some revs on the throttle arm for ten seconds. (makes me very popular at the beach where I launch)

then choke off completely, throttle arm in and into gear.
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Old 20 April 2005, 09:38   #6
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Country: UK - England
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many thanks everybody, my choke is either on or off.

i will try holding chock until starts then try my luck..
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Old 25 April 2005, 12:21   #7
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Country: UK - England
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Just To Let People Know With The Same Engine Holding The Choke On With Just A Flic Of The Key Starts The Engine First Time Everytime When Cold Then After 1-3 Seconds Bringing The Idle Up.

P.s My Choke Is The Solinoid Choke Meaning No Adjustment Either Full Open Or Off..

Thanks For The Advise.
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