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Post by sandpipper on May 1, 2008 20:48:24 GMT
Hi guys ive got real problem getting my mariner 28hp started, ive put in new
spark plugs
points
condensers
impeller
water pump
the points are set right as is the timming and ive stripped the carb gave it a good clean it was blocked up with hard gunge.
The funny thing was it would start after 20/30 pulls so it made me think of a fuel problem its got fresh oil/petrol mix.
Today i took the carb off again gave it a pull to check that the fuel pump was working and it started on one pull without the carb on now im confused.
Tony
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Post by boatman on May 1, 2008 21:40:24 GMT
just an idea have you looked at the kill switch i had the same once on a engine and it was the kill switch i bypassed it and it started every time.The bloody thing was intermitant got me going for hours
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Post by sandpipper on May 2, 2008 0:56:49 GMT
Hi thats one thing ive not looked at but will Thanks
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Post by michael1923 on May 2, 2008 15:42:34 GMT
its as fuel or air blockage. take the fill cap off the tank. Try again.
squirt a bit of fuel into the carbs, try again and so on.
It's not sucking in fuel, something is blocked. OR as previously mentioned kill switch, but if it started without the carb on, i would go for a blockage.
If you squirt a bit of fuel straight into the carbs i bet it will splutter.
Mike
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Post by sandpipper on May 2, 2008 23:24:13 GMT
Hi michael1923 i think your right as ive squirted feul in through the carb and it starts but i`ll be damded if i can find the blockage ive stripped it down twice and can blow throu all jets, think i`ll try and source a carb from somewhere.
Thanks guys
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Post by squidlips on May 3, 2008 6:08:39 GMT
if the carbs are as clean as you say,have they got fuel in the carb bowl?
if not you need to look at the fuel pump.
if the fuel is in the bowl check the carb float height as there may not be enough fuel in the bowl.
check the mixture adjusting screw is wound out 1.5 - 2.5 turns
also an easy way to clean carbs is to get someone to turn the engine over while you hold your hand over the carb air intake, effectively using the compression to suck lots of petrol through the carb.
when you have done this watch for petrol coming out of the carb air intake if petrol appears the jets are clean.
also be carefull as they sometimes start
just reading your post again,if it started without carbs on, the throttle butterfly may need to be opened slightly using the idle adjustment screw because it may be stoping any air getting into the engine causing it to flood by sucking the petrol through the main jet
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Post by scotty on May 3, 2008 17:14:14 GMT
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Post by michael1923 on May 4, 2008 9:04:52 GMT
Follow what squidlips said you won't go far wrong.
also before you do anything else, just disconnect the fuel pipe connector that conects to the fuel tank, so you have the bare end of the tube only. take off the fuel tank cap and place the fuel pipe in, prime and try starting. I once had a blockage in the fuel tank itself. it took me ages finding it, went through everything you are.
goodluck. i would bet its either a tank block, fuel pump, or as karl thinks it's carb level
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Post by sandpipper on May 5, 2008 0:56:09 GMT
Thanks for all your replys guys ive printed them off and i`ll take it down the garage tommorrow and hopefully the three inch blister on my middle finger frow trying to start it last week wont give me much jip, once again thankyou for taking time to reply to my post
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Post by monkeynuts on May 12, 2008 17:31:30 GMT
just a long shot to add to what is above, but is there a gasket behind the carb??, as it could be lean from pulling air and not enough fuel, iv had a car which was pig to start and lacked power , turned out the gasket was falling apart and sucking air
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