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Post by boss351 on Aug 23, 2023 17:30:08 GMT
Does anyone know the gas/oil ratio for the 49cc motor? Has anyone disconnected the oil feed and pre-mix the fuel?
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Post by geoff on Aug 24, 2023 6:59:22 GMT
out of interest boss, why would you do that ?
cheers
geoff
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Post by boss351 on Aug 24, 2023 16:33:25 GMT
Fair question. We're just thinking about it. The little bike does smoke a lot and we can't seem to get the mixture right. And we're in a boating community. It's common here to kill the oil-sending unit on the old 2-cycle boat motors and use pre-mixed gas.
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Post by geoff on Aug 24, 2023 19:53:17 GMT
thanks for the answer boss. I am no expert so just wanted to know your thoughts. My machine runs well but is truly difficult to start. I am sure it is a problem relating to the mixture / idling settings - but I don't know how to get them right !
cheers
geoff
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Post by velocekid2 on Sept 3, 2023 21:49:11 GMT
Hi Boss, Italjet and Suzuki don't publish the fuel oil ratio. I still have a 1982 Suzuki 50cc 'ped and the official workshop manual for it. This was the first 2T machine I owned with a mechanical oil pump. Instead of just publishing the mix ratio, they quote the amount of oil delivered in 6 minutes at 3,000 rpm!!! Yeah right!
However as a rule of thumb, I'd use the ratio qouted by Piaggio for their Vespa scooters. Their Classic large and smallframe scooters use the same ratio as their PX range which has recently been phased out due to Euro emissions. The classic (Pre 1978) scooters were pre-mix 50:1 or 2% which equates to 1/4 pint of 2T oil to 1 1/2 gallons of fuel. This is the same ratio quoted for the PX range of scooters which were fitted with a mechanical oil pump.
That ratio is the same for my 25cc McCulloch garden strimmer - or weedwhacker as you'd call it. I suggest that you use that as a basic starting point. If you find your engine is still smokey, it could be due to a build up of carbon in the exhaust pipe. I used to put a lighted blow lamp in the section of pipe that bolts to the cylinder for about 10 mins, then do the same at the tail pipe. It burns up all that excess of unburnt oil in the exhaust system - but we don't do that today now we're responsible adults - do we?!!
If you can get you hands on a new replacement exhaust, all the better. HTH
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Post by boss351 on Sept 6, 2023 23:10:43 GMT
Thanks Kid. I'm gonna' give 50:1 is a shot.
But I think I'll take a swipe at the exhaust first. I suspect this is the original component. Who knows how much sludge has built up over a few decades. I've never considered that it could be a problem.
Thanks for the help. Press on.
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